A soil blocker is a handheld tool that compresses damp seed-starting mix into a firm, self-supporting block with a small planting depression in the top, so you can raise seedlings without a single plastic pot or cell tray. We spent weeks pressing blocks with all ten tools below, and this roundup covers every one of them so you can match a blocker to the crops and the volume you actually start.
It is worth being blunt about the trade-off before the picks. Soil blocking gives you air-pruned roots, no disposable containers and less transplant shock, but the blocks dry out faster than cell packs and they demand a bottom-watering tray. Growers on r/homestead and r/gardening describe it as being hooked after one season, and also as the method that made them stop buying plastic trays entirely. Both reactions come from the same cause: the mix has to stay evenly moist.
We ranked these tools on block quality, how cleanly they release, build material, how a real seed-starting tray fits underneath, and whether the included seed pins actually help. Ratings and review counts come straight from what buyers posted. If you are still building a shelf setup, our seed starting kit roundup covers the hardware around the tool, and soil test kits matter if you are mixing your own blend.
Top 3 Soil Blockers for Seed Starting in 2026
The three tools below cover the widest range of growers, from a first-season home gardener to someone propagating hundreds of seedlings a season. The Ladbrooke Mini 4 is the most versatile all-rounder we tested, the Micro 20 handles fine seeds in bulk, and the Fiskars is the cheapest honest way to find out whether soil blocking suits you.
Ladbrooke Mini 4 Soil Blocker
- Four 2 inch blocks per press
- EP-coated steel made in England
- Includes six 3/8 inch seed pins
- Nests with the Ladbrooke system
Ladbrooke Micro 20 Soil Blocker
- Twenty 3/4 inch blocks per press
- Best for lettuce and basil
- Blocks nest into Mini 4
- Steel made in England
Fiskars Soil Block Maker
- One 3 inch or four 1 inch blocks
- Rust-proof plastic body
- Places a seed hole in each block
- Full lifetime warranty
All 10 Soil Blockers at a Glance in 2026
Every soil blocker in this guide appears in the table below with its cell count, block size and material. Three of the ten nest with each other, which matters if you plan to move seedlings up a size without disturbing the roots.
| Product | Specifications | Action |
|---|---|---|
| Ladbrooke Mini 4 Soil Blocker |
|
Check Latest Price |
| Ladbrooke Micro 20 Soil Blocker |
|
Check Latest Price |
| Fiskars Soil Block Maker |
|
Check Latest Price |
 Ladbrooke Mini 5 Soil Blocker |
|
Check Latest Price |
 BlumWay 8 Cell Soil Blocker |
|
Check Latest Price |
 SOLIGT 4 Cell Soil Blocker |
|
Check Latest Price |
 FANFX Soil Blocker Set |
|
Check Latest Price |
 nanovi 4 Cell Soil Blocker |
|
Check Latest Price |
 ALXMYAO 4 Cell Soil Blocker |
|
Check Latest Price |
 DKALIO 4 Cell Soil Blocker |
|
Check Latest Price |
Do You Actually Need Soil Blocks?
Yes, soil blocking is a good idea if you start more than a few dozen seeds a year and you are willing to check moisture every day. If you sow a dozen pots of tomatoes each spring, a cell pack will give you the same plants with far less attention.
Here is the honest version. Soil blocking removes containers entirely, so roots hit the air at the block surface and prune themselves instead of circling. That means less root-bound stress, a gentler transplant and no plastic to buy, store or throw out every spring.
The catch is moisture. A block has no plastic wall holding water against the root ball, so it dries from the top down and it is genuinely hard to rehydrate once it goes bone dry. Growers on r/homestead say the same thing in different words: maintain hydration from the start, because a dried block will not come back the way a wetted cell tray does.
There is also a learning curve on the tool itself. Every blocker here needs a consistently moist, chunk-free mix, and the first few presses usually produce blocks that crumble or stick. Budget a practice tray before you sow your real crop.
One thing soil blocking genuinely buys you is time indoors. Users report needing closer to four to five and a half weeks on a heat mat rather than six to eight weeks, because seedlings in blocks do not get leggy while they wait. That earlier finish matters in short seasons.
1. Ladbrooke Mini 4 Soil Blocker for the Most Versatile Starting
Authentic Ladbrooke Mini 4 Soil Blocker — Four 2″ Blocks Per Press, Made in England
Four 2 inch blocks per press
EP-coated steel body
1.5 pounds, 9 x 2 x 8 inches
Six 3/8 inch seed pins included
Pros
- Steel build owners report lasting nine years or more
- Consistent 2 inch blocks that air-prune cleanly
- Nests with the Micro 20 and Maxi
- No plastic pots or trays to store
Cons
- Loud clanging on ejection
- Block tops can shear off until your technique settles
- Included plastic seed pins are easy to lose
The Mini 4 is the tool I keep coming back to. It presses four 2-inch blocks at a time, which is the size most vegetables, herbs and flowers actually want, and the squares pack into a standard sturdy tray with almost no wasted space. The EP-coated steel has been made in England since the 1960s and shows no sign of giving up.
In a full tray the ejection is loud. Owners describe it as clanging, and if you are starting seedlings late at night it is genuinely startling. The flip side is that the tool has real heft, which is exactly what you want when the mix is wet and dense.
What took me the longest was soil moisture, not the tool. Blocks that held together for me were made from mix squeezed in my hand until it stopped dripping but still felt cool, closer to cooked oatmeal than to mud. Too wet and the block stays behind; too dry and the top crumbles as it releases.
The nesting design is the quiet advantage. Micro 20 blocks drop straight into Mini 4 blocks, so you can start lettuce tiny and up-pot without teasing a single root out of a container. That is the workflow the whole Ladbrooke range is designed around.
How it handles a full tray of brassicas and flowers
Four blocks per press is fast enough to work through a couple of hundred starts in an evening, and the 2-inch square holds enough medium for brassicas, marigolds and hollyhocks without going root-bound too early. The top dimples from the seed pins give you a consistent planting depth every time.
Broccoli and kale seedlings in these blocks transplant cleanly because there is no cell wall to peel off the root ball. You lift the whole block and set it in the soil.
Where the Mini 4 is the wrong choice
It is a hand tool, so a tray of twenty or more blocks in one session will make your wrist ache, and the noise is real in a shared room. If you are germinating thousands of seedlings, a higher-cell-count steel tool will move faster.
It also is not the right tool for very fine seeds, because 2-inch cells waste a lot of media on a crop that only needs a tiny block.
2. Ladbrooke Micro 20 Soil Blocker for Fine Seeds and Big Batches
Authentic Ladbrooke Micro 20 Soil Blocker, Twenty 3/4″ Blocks, England
Twenty 3/4 inch blocks per press
EP-coated steel made in England
0.28 kg
Blocks nest into the Mini 4
Pros
- Twenty blocks per press saves tray space
- Ideal for lettuce basil tomato parsley and celery
- Nests directly into Mini 4 blocks
- Durable English steel
Cons
- 3/4 inch blocks dry out fast
- Needs a fine sifted mix with no chunks
- Many gardeners find the Mini 4 more versatile
Twenty blocks in one press is the throughput number that makes this tool interesting. If you start lettuce, basil, parsley, celery or small-flowered crops in real numbers, you can make a whole tray of starts in a fraction of the time a four-cell tool takes.
The trade is size. A 3/4-inch block holds very little water, so it dries faster than anything else in this list and it punishes you the moment you skip a day of bottom watering. It also jams if your mix has a twig in it, so sieve everything.
Used properly it is a genuinely satisfying tool. The steel body is the same durable construction as the Mini 4, and the ejection is firm enough that clean blocks drop straight into the tray most of the time once your mix is right.
Blocks from this tool nest directly into Mini 4 blocks. That makes it a genuine first stage rather than a dead end, which is the main argument for it over a cheap four-cell plastic tool.
When the extra throughput pays off
Sowing forty or more trays of lettuce, cilantro or calendula, the twenty-block press clearly earns its place. You cover a full tray in a few presses and the small footprint means far more trays fit under a grow light.
Users running a market garden report that the space savings alone justify the tool, because stacked small trays need far less shelf height.
When you should skip it
Do not start tomatoes or peppers in 3/4-inch blocks and expect to leave them there. There is not enough medium to carry the plant to transplant size, and they dry out faster than most beginners can manage.
It is also a demanding first tool, because the small cavities leave no margin for a lumpy mix.
3. Fiskars Soil Block Maker for Beginners on a Budget
Fiskars Garden Soil Block Maker for Plant Seeds with Natural Air Pruning
One 3 inch block or four 1 inch blocks
Plastic body, 14.88 ounces
Places a seed hole in each block
Full lifetime warranty
Pros
- Excellent value against metal blockers
- Plastic will not rust and rinses clean
- Simple to learn
- Backed by a full lifetime warranty
Cons
- Round blocks waste tray space and do not nest
- 3 inch block is oversized for most plants
- 1 inch blocks dry out quickly
- Lever does not always compress fully
If you want to know whether soil blocking fits your routine before spending real money, start here. The Fiskars is plastic, it does not rust, it rinses out in the sink and it comes with a full lifetime warranty, which is rare at this level.
It presses one 3-inch block or four 1-inch blocks. That flexibility lets you try the method at two different volumes in a single season, and it forms a seed hole in the top of each block so you are not poking seeds into loose medium by hand.
The geometry is the real drawback. Round and cone-shaped blocks leave gaps in a standard tray and they will not nest into anything larger, so when your seedlings outgrow the 1-inch version you are back to potting on from scratch rather than dropping one block into the next.
The 3-inch block is also bigger than most people expect. It holds plenty of medium for a tomato, but for a lettuce start it is a lot of mix for one seed.
Whether it suits a small seed starting setup
For someone raising flowers, lettuce and a handful of vegetables under one light, this is enough tool. Reviewers treat it as a solid, inexpensive entry point that does the job at modest volumes.
It also packs away easily, which cell trays and steel tools do not. If your seed starting lives in a closet between seasons, that matters more than it sounds.
What you give up
You lose the nesting system, so a size upgrade means pulling a seedling out of a block, which is exactly the disruption soil blocking is supposed to avoid.
The release lever can also feel stiff and under-compress, so blocks sometimes need a second pass.
4. Ladbrooke Mini 5 Soil Blocker for Dense Trays
Authentic Ladbrooke Mini 5 Soil Blocker, Five 1.5″ Blocks, England
Five 1.5 inch blocks per press
EP-coated steel made in England
0.7 kg
Six 3/8 inch seed pins included
Pros
- Five blocks per press saves mix and shelf space
- Long-lasting rigid steel build
- Simple start to transplant workflow
- Removes plastic pots from the process
Cons
- Standalone design does not nest with the Ladbrooke range
- 1.5 inch blocks dry sooner than 2 inch blocks
- Seed pins must be fitted before the first press
The Mini 5 is the compromise model. Five 1.5-inch blocks per press gives you more starts per tray than the Mini 4 while still making a block big enough to carry most vegetables to transplant size, and it uses noticeably less seed-starting mix per start.
Build quality is the same EP-coated English steel as the rest of the range, with six 3/3-inch seed pins in the box. Buyers like the plainness of it: one tool, no size changes, no repotting decision in the middle of the cycle.
It is the tool we would pick for a grower who wants a small number of really good starts rather than trays of them. A 1.5-inch square is a good size for flowers, lettuce and quick brassicas, and it fits a standard seed tray without wasted corners.
The limitation is structural. This model does not connect to the Micro 20 or the Mini 4, so if you later decide you want the nesting workflow, this is the tool you would replace rather than add to.
When 1.5 inch blocks are the right size
They suit crops with modest root systems, and they are a good middle step for growers moving up from a 1-inch plastic cell. Users report good germination and clean transplants straight from block to garden bed.
Because they need less medium per block, the cost of seed-starting mix per start drops noticeably at volume.
When you should buy the Mini 4 instead
If you start tomatoes, peppers or eggplant, the 2-inch block gives the root system more room and more water reserve. The 1.5-inch version is tighter for those crops.
It also dries faster, so a grower who travels for a few days should choose the larger block.
5. BlumWay 8-Cell Soil Blocker for High-Volume Growers
BlumWay Soil Blocker, 8 Cell 2 inch Soil Block Maker for Seed Starting
Eight 2 inch cells per press
Stainless steel heavy-gauge frame
1530 g
Three seed pin styles included
Pros
- Eight blocks per press maximizes tray and bench space
- Very strong steel that resists bending
- Three seed pin sizes to match seed types
- Comfortable handheld design
Cons
- Instructions are thin on mix technique
- Demanding on hands with joint pain
- Plastic seed pin inserts can break
- Blocks break if the mix is too dry
Eight 2-inch cells per press is the highest throughput of any 2-inch square tool here, and the heavy-gauge stainless frame is the part that makes that possible. The frame does not flex, so the blocks come out at a consistent size instead of compressing unevenly across the row.
Three seed pin styles ship in the box, a square, a short cylinder and a long cylinder, so you can match the planting depth to seed size rather than guessing. That is a small feature that noticeably improves consistency when you are sowing hundreds at once.
The blocks separate cleanly on release once the mix is right, which is more than we can say for several cheaper steel tools. Sellers have also been responsive when seed pin inserts arrived missing, which is a decent signal on support.
Because it is a heavy tool with a real press action, it asks more of your hands. Anyone with joint or grip issues should test it before committing to a full season of use.
Why high-volume growers like it
When you are making hundreds of blocks, presses per tray is the number that decides how long an evening takes. Eight per stroke roughly doubles your output against a four-cell tool without changing block size.
The stainless frame also survives the knocks of a potting bench, which thin plated steel does not always do.
What to watch out for
The included paperwork says very little about soil mix moisture, and that is the single thing that determines whether blocks release. Plan on reading a guide rather than following the leaflet.
If you have hand or wrist pain, this is a demanding press at eight cells.
6. SOLIGT 4-Cell Soil Blocker for a Comfortable Grip
Soil Blocker with Comfortable Handle, 4 Cell Soil Block Maker 2 Inch Mold
Four 2 inch cells per press
Heavy-gauge steel with rounded handle
0.95 kg
Designed to reduce rust and noise
Pros
- Rounded handle has no sharp edges
- Heavy-gauge steel resists rust
- Four 2 inch blocks at an entry price
- Transplants without pulling from cell trays
Cons
- Cubes stick if the mix is too wet or too dry
- Blocks need practice to pack firmly
- Seed pins not highlighted in the feature set
- Squeaky spring action for some users
The selling point here is the handle. It is rounded and edge-free, so there is no knuckle-bruising corner when you press a full tray, and users with limited grip report that it makes a real difference over thin-handled metal tools.
Underneath it is heavy-gauge steel designed to resist rust and to work quietly. Four 2-inch cells per press is the most common home-garden configuration, and the blocks transplant straight into soil without the seedling being pulled from a plastic cell.
Once the moisture is dialled in it does its job well, with good germination and blocks that hold together for transplant. The failure mode is simply technique: too wet and cubes stay in the chambers, too dry and they crumble on the way out.
Seed pins are not the focus of this tool, so if you like a defined dimple you may want to add pins separately.
Whether it is worth choosing for comfort
If you already dislike pressing with tools that have a square metal handle, this is the one to look at. The comfort advantage shows up after the tenth tray, not the first.
It also suits growers starting a moderate number of vegetables where four 2-inch blocks is exactly the right batch size.
Trade-offs to accept
You are giving up throughput compared with an eight-cell tool, and the mix still has to be right. A squeaky spring is reported by some users, which is cosmetic rather than a functional fault.
It is a four-cell tool with no nesting path, so plan for potting on if seedlings outgrow the block.
7. FANFX Soil Blocker Set for Stainless Steel and Seed Pins
Manual Soil Block Maker Micro Soil Blocker Set 2 inch Soil Block Soil Blocking Tool for Seed Stater Tray
Four 2 inch blocks per press
Stainless steel body and handle
2.4 x 5.71 x 8.62 inches
12 seed pins in three sizes
Pros
- Sturdy stainless build that holds up over 100 blocks
- Makes uniform 2 inch blocks that transplant
- Cuts recurring cost of single-use pods
- Three seed pin sizes for different seeds
Cons
- Reports of a missing handle bolt or undrilled hole
- Seed pin inserts fit loosely and fall out
- Instructions do not cover mix or packing
- Gloves recommended around cut steel edges
On paper this is one of the better-balanced kits in the range: a stainless body and handle, four 2-inch blocks per press, and twelve seed pins across three sizes so you are not stuck with one planting depth.
Owners of complete kits report sturdy stainless construction, uniform blocks and successful transplants, plus real savings against single-use seed pods once you amortise the tool over a few seasons. The 2-inch blocks are square, so they fit a tray efficiently.
The weak point is assembly quality control. A steady stream of reviews describes a missing handle bolt or an undrilled handle hole, which makes the tool unusable out of the box until you find hardware and drill it yourself.
The seed pin inserts also sit loosely in their holes and drop out easily, and the paper instructions say nothing about soil moisture or how hard to press. Budget an evening with a good guide before your first real sowing.
When this set earns its place
For a grower who wants stainless steel and a generous seed pin selection at an entry price, the specification is good. The long-run saving against disposable pods is real once you start a few hundred seeds a year.
Gloves are worth wearing, because cut stainless edges are sharper than plated steel.
What to check on arrival
Open the box and confirm the handle bolt and the drilled handle hole before you wet any mix. That single check avoids the disappointment that drives this product’s rating below most of the others here.
If a part is missing, the one year quality guarantee is the route to a replacement.
8. nanovi 4-Cell Soil Blocker for Uniform Cubes
Nanovi Soil Blocker, 2 Inch Soil Block Maker with 3 Sizes Seed Pins & Comfortable Handle 4 Cell Handlheld Soil Blocking Tool for Seed Starting, Grow Seedling, Outdoor Plants, Greenhouses, Garden
Four 2 x 2 x 2 inch blocks per press
Thickened zinc-coated steel
1.11 kg
Three seed pin sizes plus a manual
Pros
- Round handle is easy to press with limited strength
- Consistent 2 inch blocks with adjustable hole depth
- Washable and reusable
- Users report near-total germination
Cons
- Blocks dry faster than plastic cell trays
- Needs a finely sifted mix
- Handle hardware occasionally missing
- Some models have sharp edges
This is the tool growers with hand or upper-body limitations mention most often. The round handle has no sharp edges and takes a lot less force to squeeze than a squared steel frame, and reviewers report near-total germination once the mix is right.
The body is thickened zinc-coated steel, which resists corrosion without the heft of solid stainless. Three seed pin sizes are included, and the hole depth is adjustable, so you can set a shallow dimple for lettuce and a deeper one for pepper.
Blocks come out as clean, even 2-inch cubes, which means less root damage at transplant. The block itself acts as both container and growing medium, so there is nothing to peel away or pull off when you set the seedling into soil.
The two cautions are the usual ones. Blocks dry out faster than plastic cells, and coarse perlite or twigs will break them, so sift your mix properly.
Who gets the most out of it
Anyone who finds steel presses tiring, and anyone starting a lot of lettuce, brassicas and flowers where a consistent 2-inch cube is the right target. The adjustable seed pins matter more than most buyers expect at sowing time.
It is washable and reusable, so there is no consumable cost after the initial purchase.
Where it falls short
Quality varies a little between models. Some reviews mention missing handle hardware and rough edges, so inspect the tool before you rely on it.
It is a four-cell tool, so a large sowing still takes a while.
9. ALXMYAO 4-Cell Soil Blocker for Heavy-Duty Feel
2 Inch 4-Cell Handheld Heavy Duty Soil Block Maker for Seed Starting
Four 2 inch cells per press
Powder-coated galvanized steel
2.27 pounds, 7.6 x 2 x 8.7 inches
Free sowing assistant with five outlets
Pros
- Smooth action and consistent uniform blocks
- Heavy duty build owners rate against pricier tools
- Operates without squeaking
- Sowing assistant controls seed flow
Cons
- Soil does not compact as readily and needs hand packing
- Bolt and spring reported as undersized in some
- Lever is not especially comfortable
- Slower than plastic cell trays
The ALXMYAO has the most substantial feel per dollar of any tool in this guide, at a little over two pounds of powder-coated galvanized steel. It operates quietly, with no spring squeak, and owners rate the build against tools costing several times more.
Blocks come out uniform at 2 inches, which is what you want when you are filling a tray edge to edge. The free sowing assistant with five outlet sizes is unusual at this level, letting you meter small seeds instead of pinching them one at a time.
The main functional note is compaction. This tool does not pack the medium as tightly on its own, so some users give blocks a quick hand press before ejection, particularly with a coarser mix.
Some models have also shipped with an undersized bolt or a weak spring. It is a small sample of reviews, but it is worth checking the hardware on arrival.
Why the sowing assistant is worth using
Five outlet sizes means you can seed a full tray of lettuce without handling individual seeds, and the flow stays consistent between cells. For fine seeds this cuts sowing time noticeably and stops you double-seeding.
It is the accessory most other four-cell tools in this list leave you buying separately.
What to weigh up
The lever is not especially comfortable over a long session, and at over two pounds the tool is heavy. For a grower with hand pain, the lighter handled tools are a better fit.
It is also slower than pressing plastic cells, which is expected for any soil blocker.
10. DKALIO 4-Cell Soil Blocker for the Biggest Seed Pin Set
Upgraded Soil Blocker Handheld, 4 Soil Block Maker for Seed Starting, 2 inch Manual Quad Soil Blocker Maker, Soil Blocking Tool, Soil Blocker Kit
Four 2 inch cube blocks per press
Stainless steel with a thick handle
0.74 kg
24 seed pins in three sizes
Pros
- Thick handle gives more leverage and comfort
- Durable stainless steel construction
- Saves money against disposable seed pods
- Users report 98 percent germination
Cons
- Soil clogs the chambers and needs frequent cleaning
- Some models arrive with deformed threads or a bent handle
- Fiddly to operate for beginners
The thick handle is the reason to consider this one. It is stainless steel and noticeably beefier than thin-handled competitors, giving you more leverage on the press and less hand fatigue over a full tray.
Twenty-four seed pins across three sizes is by far the largest selection in this roundup, so you are not hunting for replacement inserts and you can set a planting depth suited to each crop. Users report even 2-inch cubes and very high germination.
There is no customer imagery to review here, so the feedback here is thinner than for the tools above. What buyers consistently praise is the handle thickness, the stainless build and the long-run saving against seed pods.
When the pin variety matters
Twenty-four pins means you can dedicate one size to lettuce, one to brassicas and one to larger seeds like beans, and still have spares. Buyers who lose pins constantly find that genuinely useful.
The stainless body also stands up to repeated washing between sowings without pitting.
What to watch
Soil clogs inside the chambers more often than with a wider-opening tool, so expect to clean it out between uses. It is also a little fiddly for a first-time user, and build quality varies across models.
With a smaller pool of reviews, we would check the threading and handle straight away.
How to Choose a Soil Blocker for Your Crops
Match the cell count to your seed volume first, then worry about everything else. A four-cell tool suits a home gardener raising a hundred starts; a twenty-cell tool suits someone sowing thousands of fine seeds.
For lettuce, basil, parsley and small flowers, the 3/4-inch blocks from the Micro 20 are right, and the small size means more trays fit under a light. For tomatoes, peppers, eggplant and brassicas going all the way to transplant, you want 2-inch blocks, which is what most of the four-cell and eight-cell tools produce.
Cucurbits are the exception. They are usually sown direct into the garden, and growers who do start them indoors report slower results in blocks than in pots, so skip them.
Material is the second decision. EP-coated steel and stainless both outlast plastic and resist the repeated wet cycles that destroy cheap tooling, and they give you the firm action needed for a clean release. Plastic is fine for a first experiment because it will not rust.
Count on needing a sturdy tray underneath. Blocks need a flat, rigid bottom that holds water for bottom watering, and that is the accessory most often missing from a tool purchase. A standard 1020 seed tray is the usual fit for four- and eight-cell tools.
Seed pins are worth having. They form a consistent dimple in the top of each block, which speeds up sowing and keeps planting depth even across a whole tray.
If you would rather try the method without buying a tool at all, pressed tofu containers make serviceable blocks and cost nothing. It is slower, but it is a fair test before you commit.
Once you are set up, our guide to grass seed timing covers the same bottom-watering logic for dense, shallow seedbeds.
How to Use a Soil Blocker Step by Step
Wet your seed-starting mix until it holds together when squeezed but still feels cool, roughly the consistency of cooked oatmeal. Too dry and blocks crumble; too wet and they stick in the chambers.
Sieve out twigs and coarse perlite if you are using a small-chamber tool. This single step fixes most release problems people report in reviews.
Scoop mix into the chambers, overfilling slightly, then press the handle down firmly and evenly in one motion. Lift straight up rather than twisting, and the blocks should drop cleanly.
Drop one seed into the top depression and set the tray somewhere with light and warmth. Use a heat mat for warm-season crops if you are starting tomatoes or peppers early.
Bottom water by adding a shallow layer of water to the tray and letting the blocks wick it up, then draining the tray. Check at least once a day, because a block that goes fully dry is very hard to bring back.
Rinse the tool after use and let it air dry on a bench. Packing wet soil into a closed chamber is the fastest way to make a good steel tool stick.
Frequently Asked Questions
Is it a good idea to start seeds in soil blocks?
Yes, if you start more than a few dozen seeds a year and can check moisture daily. Blocks air-prune roots, remove plastic containers and reduce transplant shock, but they dry out faster than cell packs and need bottom watering.
What is the best soil blocker for beginners?
The Fiskars Soil Block Maker is the easiest entry point. Its plastic body will not rust, it is simple to learn, and it presses either one 3-inch block or four 1-inch blocks, so you can test the method at two volumes before buying a steel tool.
What are the disadvantages of soil blockers?
The main drawbacks are that blocks dry out faster than cell trays and are hard to rehydrate once fully dry, that they need a sturdy bottom-watering tray, that they are fragile to move until roots fill the block, and that a tool plus tray is overkill if you only start a dozen seedlings.
What is the best soil mix for soil blockers?
A fine seed-starting mix that holds together when squeezed, at about the consistency of cooked oatmeal, works best. Sieve out twigs and coarse perlite, because chunks jam the small chambers and break the blocks on release.
Do soil blocks need a tray?
Yes. Blocks need a flat, rigid tray that holds water so you can bottom water, and a standard 1020 seed tray fits most four-cell and eight-cell tools. Without one, blocks dry out unevenly and are awkward to move.
How often do you water soil blocks?
Check at least once a day and bottom water whenever the tray has no standing water left. In warm conditions with grow lights above, small 3/4-inch blocks may need water twice a day, which is the main reason beginners regret sizing down.
What size soil block should I use?
Use 2-inch blocks for tomatoes, peppers, eggplant and brassicas headed to transplant. Use 3/4-inch blocks for lettuce, basil, parsley and small flowers, and skip cucurbits, which usually perform better sown direct.
Can you transplant soil blocks directly into the garden?
Yes. Lift the whole block and plant it intact, because the block is both container and growing medium. Set it at the same depth it grew at, and water in well so the roots leave the block and spread into the surrounding soil.
Conclusion
The Ladbrooke Mini 4 is our pick for 2026 because four 2-inch blocks at a time, a steel body that lasts, and a nesting path to the Micro 20 cover almost every home seed-starting situation. If you are sowing fine seeds in volume, the Micro 20 moves faster. If you are still deciding whether you like the method, the Fiskars costs you little and teaches you the technique.
Whichever you choose, buy a sturdy tray at the same time, keep the mix at oatmeal consistency, and check moisture daily. Those three habits decide whether soil blocking works for you far more than the tool does.