5 Best 20 Cell Soil Blocker: Top Product Picks and Buying Guide
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Choosing the best 20 cell soil blocker means balancing output, block size, handling comfort, and the kind of seeds you start most often. A large commercial tool can save time in a greenhouse, while a compact handheld model may be easier for a small home garden.
My first choice is Ladbrooke Ladbrooke Authentic Multi 20 Commercial Soil Blocker England 20-Cell. Its 1.5-inch blocks, long handle, included seed pins, and zinc-coated steel construction make it especially practical for serious gardeners, greenhouses, and small farms.
My second choice is Ladbrooke Micro 20 Soil Blocker Twenty 3/4 Blocks England. It produces twenty small blocks at a time, nests into the brand’s Mini 4 blocks, and uses corrosion-resistant coated steel for repeated seasonal use.
My third choice is BlumWay Soil Blocker. BlumWay Soil Blocker 8 Cell 2 Inch Soil Block Maker for Seed Starting earns third place as a versatile handheld option for gardeners who want larger two-inch blocks without using a floor-standing tool. Its three seed-pin styles and eight-cell capacity offer a useful middle ground between high-volume production and easy portability.
This guide explains what separates the five picks, which crops and growing situations suit each one, and what to know about soil moisture, seed-pin selection, block handling, cleaning, storage, and long-term ownership before buying.
Best 20 Cell Soil Blocker
I selected these products for their relevance to multi-cell soil blocking, practical differences in block size and capacity, construction details, included accessories, and customer-feedback evidence where available. I also included more than one brand and both stand-up and handheld formats so the comparison reflects the different ways home gardeners, greenhouse growers, and small farms use soil blockers.
| # | Image | Product | Price on Amazon |
|---|---|---|---|
| 1 |  |
Ladbrooke Ladbrooke Authentic Multi 20 Commercial Soil Blocker England 20-Cell | Check Price |
| 2 |  |
Ladbrooke Micro 20 Soil Blocker Twenty 3/4 Blocks England | Check Price |
| 3 |  |
BlumWay Soil Blocker | Check Price |
| 4 |  |
NVRGIUP 4-Cell 2-Inch Soil Block Maker | Check Price |
| 5 |  |
nanovi 4-Cell 2-Inch Soil Block Maker | Check Price |
Ladbrooke Ladbrooke Authentic Multi 20 Commercial Soil Blocker England 20-Cell
The Ladbrooke Multi 20 is the strongest choice for gardeners who need substantial output without pressing individual blocks one at a time. Each press creates twenty 1.5-inch cubes, which is a useful size for many seedlings and cuttings while still conserving tray and grow-light space. The stand-up format also moves the work from a tabletop to the floor, reducing the need to bend over a small handheld mold during a large seed-starting session.
A long handle gives the tool leverage when compressing wet potting mix into the mold. Once the mix is packed, the ejection handle helps discharge the blocks into a tray. That basic workflow is simple, but it still depends on using a properly moistened, cohesive blocking mix; dry or chunky material will not form clean cubes merely because the blocker is commercial grade.
Included 5/8-inch seed pins create smaller planting holes, while optional 1-inch dowel pins can be purchased separately for larger seeds or deeper openings. The zinc-plated steel construction is intended for years of use, although the handmade finish may show cosmetic blemishes or water-bathing marks from manufacturing. This is a production-oriented tool rather than a compact starter gadget, so its size and cost may be more than a balcony gardener needs.
Pros
- Creates twenty 1.5-inch blocks per press.
- Stand-up, long-handle design suits larger planting quantities.
- Includes 5/8-inch seed pins.
- Zinc-coated steel is built for repeated use.
- Useful for seeds and cuttings.
Cons
- 1-inch dowel pins must be purchased separately.
- Its floor-standing format is excessive for very small batches.
- Requires carefully prepared moist soil-blocking mix.
My Opinion
This is the best overall fit for a greenhouse grower or serious home gardener who values throughput and an upright working position. Choose it when twenty 1.5-inch blocks per press will actually be used; otherwise, a handheld four- or eight-cell model will be easier to store and justify.
Ladbrooke Micro 20 Soil Blocker Twenty 3/4 Blocks England
The Ladbrooke Micro 20 takes the high-capacity concept in a smaller direction. It presses twenty 3/4-inch blocks at once, making it particularly well suited to fine seeds such as lettuce, basil, tomato, parsley, celery, and small-seeded flowers. The small cavities let a grower start many plants in limited tray or grow-light space, but they are not intended to give large, fast-growing seedlings unlimited room.
One of the most useful details is compatibility with the Ladbrooke nesting system. Micro 20 blocks can nest directly into Mini 4 blocks, allowing seedlings to move into a larger block without the usual extraction and repotting step. That can reduce root disturbance and make the small-block format more practical for crops that need additional growing time before transplanting.
The black EP-coated steel is described as resistant to corrosion, moisture, and soil chemicals, while the tool has been manufactured in England since the 1960s. Buyers should pay close attention to soil preparation: the 3/4-inch cavities are small, so rocks, twigs, and chunky ingredients can prevent clean filling or make blocks crumble. The tool is less suitable for squash, beans, cucumbers, and other crops that need a larger starting block; the supplied guidance points those growers toward a larger Ladbrooke format instead.
Pros
- Makes twenty 3/4-inch blocks per press.
- Well suited to fine seeds and crowded starting areas.
- Micro blocks nest into Ladbrooke Mini 4 blocks.
- EP-coated steel resists moisture and soil chemicals.
- Strong customer feedback is available, with a 4.4-star rating from 652 ratings.
Cons
- Small blocks are not ideal for large-seeded or vigorous crops.
- Requires a fine, debris-free blocking mix.
- The nesting advantage is greatest for gardeners already using compatible Ladbrooke blocks.
My Opinion
This is the most specialized pick in the group and an excellent alternative for fine-seed production. It ranks below the Multi 20 because its 3/4-inch blocks limit crop range, but its high capacity and nesting path make it unusually useful for organized seed-starting systems.
BlumWay Soil Blocker
BlumWay’s eight-cell blocker occupies the practical middle of this list. It makes eight two-inch blocks at a time, giving seedlings more room than the Ladbrooke Micro 20 while producing more blocks per press than a four-cell handheld tool. That size and capacity combination should appeal to home gardeners who start a moderate number of tomatoes, flowers, vegetables, or cuttings and want a tool that can move easily between a potting bench and garden shed.
The stainless-steel construction is described as heavy gauge and resistant to corrosion. A strong structure is important with a handheld blocker because the user supplies the downward pressure and then needs the blocks to separate rather than remain stuck in the mold. BlumWay includes three pin styles: square, short cylinder, and long cylinder. The choice lets the grower adjust the opening for different seed sizes or planting preferences instead of accepting one fixed cavity.
Its compact format is easier to carry and store than a stand-up commercial unit, but pressing eight blocks still requires repeated hand and arm effort. The product description says it is suitable for any kind of soil, yet clean, cohesive blocks still depend on moisture and texture in practice; chunky or overly dry material can undermine separation. The two-inch format is generous for seedlings, though it also uses more mix and tray space per plant than the smaller Ladbrooke Micro 20.
Pros
- Produces eight two-inch blocks per press.
- Includes three different seed-pin styles.
- Compact handheld design is easy to carry.
- Heavy-gauge stainless steel is easy to clean and intended for long use.
- Useful for seeds and cuttings.
Cons
- Hand pressing can become tiring during very large batches.
- Two-inch blocks consume more mix and space than 3/4-inch blocks.
- It does not match the twenty-block output of the Ladbrooke tools.
My Opinion
BlumWay is the most balanced option for a gardener who wants larger blocks but does not need a commercial stand-up machine. The eight-cell capacity, portable body, and three pin choices give it broader everyday flexibility than a highly specialized fine-seed blocker.
NVRGIUP 4-Cell 2-Inch Soil Block Maker
NVRGIUP’s handheld blocker creates four two-inch cubes at a time, making it a sensible choice for small planting batches and gardeners who prefer a simple tool with a limited footprint. The four-cell arrangement is slower than an eight- or twenty-cell model, but it can be easier to manage when only a few varieties need starting or when the available potting bench space is tight.
The thickened round handle is intended to spread pressure across the hand and avoid sharp edges. That matters during repeated presses, particularly because a two-inch mold requires a firm, even compression to form stable blocks. The iron construction is described as sturdy and suitable for repeated use, while the tool’s reusable format can reduce dependence on disposable plastic pots and cell trays.
Three seed-pin sizes add flexibility for seedlings and cuttings. The pins create a pre-formed indentation, so seeds can be placed consistently instead of being pushed randomly into the surface. NVRGIUP specifically emphasizes moist soil as necessary for block formation. That note should be taken seriously: adding too much water can make a muddy mass, while too little moisture leaves loose corners and weak edges. The product has a 4.1-star rating from 230 ratings, lower than several other picks here, so buyers may reasonably prioritize the comfortable handle and modest batch size over maximum production.
Pros
- Forms four two-inch blocks per press.
- Includes three sizes of seed pins.
- Round handle is intended to improve hand comfort.
- Reusable construction can reduce plastic container use.
- Compact format suits small gardens and occasional batches.
Cons
- Four blocks per press is slow for a large greenhouse planting.
- Requires moist soil for successful block formation.
- Its 4.1-star customer rating is the lowest among these five selections.
My Opinion
This is a straightforward choice for beginners who want two-inch blocks without committing to a larger multi-cell tool. It makes the most sense when portability, manageable batch sizes, and the three pin options matter more than speed.
nanovi 4-Cell 2-Inch Soil Block Maker
Nanovi offers another compact four-cell tool for gardeners who want two-inch blocks and a handheld workflow. Its refined zinc-coated steel construction is described as thickened, waterproof, and resistant to deformation, giving it a practical advantage for owners who expect to wash and reuse the blocker across multiple seed-starting seasons. The round handle is meant to make pressing more comfortable and to avoid sharp contact points.
Three seed pins are included, with different dimensions for varying seed-hole needs. That makes the tool more adaptable than a mold with one permanent opening, especially when a seed-starting tray contains several crop types. The tool can also make blocks with holes already formed, which saves a separate poking step and helps keep planting depth more consistent from cell to cell.
Nanovi describes a simple sequence: install the pins, press the blocker into moist soil, place it over a seed flat, and squeeze to release four two-inch blocks. That procedure is approachable for first-time users, although the limited four-block capacity means a large planting list will take patience. The two-inch cubes provide useful root space but require more mix and room than small blocks. With a 4.4-star rating from 156 ratings, it has solid customer-feedback evidence, though the closely related NVRGIUP option may appeal more to buyers who prefer its particular handle design.
Pros
- Creates four two-inch blocks per press.
- Includes three seed-pin sizes.
- Zinc-coated steel is intended for repeated, washable use.
- Round handle supports a comfortable handheld process.
- Suitable for seedlings, cuttings, gardens, and greenhouses.
Cons
- Four-cell output is limited for high-volume production.
- Two-inch blocks require more soil and space than smaller formats.
- Users must control moisture carefully for clean release.
My Opinion
Nanovi is a good compact alternative when durable coated steel and multiple pin sizes are the main priorities. It is best for modest batches, not for replacing a commercial twenty-cell tool, but its 4.4-star customer rating and simple operating sequence make it approachable for beginners.
How I Selected These Soil Blockers for the Topic
The selection emphasizes useful differences rather than treating every multi-cell mold as interchangeable. Capacity, block dimensions, operating position, included seed pins, material, portability, crop suitability, and stated maintenance benefits all influenced the order. Customer ratings and rating counts were considered where supplied, but a rating alone does not explain whether a tool suits fine seeds, large seedlings, or commercial quantities.
Capacity only helps when the block size matches the crop. Twenty tiny blocks can be more useful than four large ones for lettuce, while four two-inch blocks may be better for a small batch of vigorous seedlings.
The Ladbrooke tools receive the top positions because they offer the clearest specialization and system-level advantages: the Multi 20 targets high-volume 1.5-inch production, while the Micro 20 concentrates on fine seeds and compatible nesting. BlumWay follows as a flexible eight-cell option. The NVRGIUP and nanovi tools remain useful for smaller batches, with their rankings separated by the supplied product details and customer-feedback evidence rather than by a claim of hands-on performance.
None of these tools can compensate for unsuitable mix. Moisture, texture, and compression determine whether a block leaves the mold intact, so soil preparation belongs in the buying decision.
How to Choose a 20-Cell Soil Blocker for Your Garden
Start with the crops and the number of plants you expect to start at one time. A high-output tool is worthwhile for greenhouse production, but a small handheld blocker may be less frustrating for occasional use. Consider the block dimensions, how much physical effort you want to provide, and whether included pins match the seeds you plan to sow.
- Match capacity to batch size: Twenty cells suit repeated production; four cells suit small, varied batches.
- Match block size to crop: Three-quarter-inch blocks favor fine seeds, while two-inch blocks provide more starting room.
- Check pin options: Different seed-pin shapes and sizes can make one tool more useful across several crops.
- Consider working position: A stand-up model reduces tabletop bending, while a handheld model is easier to move and store.
- Plan for the mix: Fine cavities need a consistent, debris-free medium that holds together when compressed.
Capacity and planting volume
Cell count affects speed, but it also affects how much mix must be prepared and how many blocks need to be handled at once. The Multi 20 and Micro 20 both produce twenty blocks, making them efficient for gardeners who sow many plants of the same size. The BlumWay eight-cell model cuts the batch size in half, which can be convenient when several varieties require separate mixes or sowing dates. Four-cell tools offer maximum control for small runs but require more presses for a full flat.
Choosing the right block dimensions
Small blocks conserve space and mix, but seedlings may outgrow them quickly. The Micro 20’s 3/4-inch blocks make sense for fine-seeded plants and for growers who plan to move them into compatible larger blocks. A 1.5-inch block is a more general middle size for many seedlings and cuttings. Two-inch blocks offer more room at the start, though they take more material and may need wider spacing under lights.
Stand-up versus handheld operation
A stand-up blocker is most attractive when repeated pressing would make a tabletop session uncomfortable. The long handle and floor-based position of the Multi 20 suit production work. Handheld tools are simpler to transport, store, and use in a small potting area. Their limitation is that the user supplies the pressing force directly, so output and comfort depend more on batch size, soil consistency, and personal tolerance for repetitive motion.
Seed-pin flexibility
Seed pins form openings before sowing. A smaller opening can prevent tiny seeds from disappearing too deeply, while a larger cavity may accommodate bigger seed or a deeper placement. The Ladbrooke Multi 20 includes 5/8-inch seed pins and allows separate 1-inch dowel pins, while the BlumWay, NVRGIUP, and nanovi tools include three pin styles or sizes. Before buying, consider whether the pins are easy to change and whether the supplied options cover the crops on your list.
How to Prepare Soil for Clean Blocks
Soil blocking requires a mix that is damp enough to bind under pressure but not so wet that it becomes a shapeless paste. Begin with a fine, evenly blended medium. Remove rocks, sticks, bark chunks, and other coarse pieces, especially when using a 3/4-inch mold. Small cavities leave little room for irregular material, and one obstruction can create a weak corner or prevent the mold from filling evenly.
Add water gradually while mixing rather than flooding the entire batch at once. The goal is an evenly moist texture that holds its shape when compressed. If the mix falls apart as it leaves the mold, it likely needs more moisture or better blending. If it smears heavily onto the tool and loses definition, reduce the water slightly and remix. Different potting mixes absorb water at different rates, so allow a short pause after wetting before making a final adjustment.
First-Time Setup and Use
- Read the included instructions and identify the seed-pin mounting points.
- Install the pin size that best matches the seeds being planted.
- Prepare a clean tray or flat that can receive the finished blocks.
- Fill or press the blocker into evenly moist mix, following the tool’s operating style.
- Compress firmly enough to create stable cubes without forcing the handle.
- Release the blocks over the tray and check that edges and holes remain defined.
- Place seeds in the indentations and label each group immediately.
For the first batch, make only a few blocks before preparing a large quantity. This lets you adjust moisture and pressure before committing a full tub of mix. Keep the blocks supported by a tray once released; newly formed cubes can be handled, but they are not as forgiving as rigid plastic cells if lifted carelessly.
Using Different Block Sizes Effectively
Use the Micro 20 for crops that begin with small seeds and do not need a large root zone immediately. Its nesting compatibility is especially helpful when a seedling must remain in the blocking system for longer than the smallest cube allows. The Multi 20’s 1.5-inch blocks provide a broader general-purpose format and are more appropriate when twenty blocks are needed without starting at the smallest size.
Two-inch blocks from BlumWay, NVRGIUP, or nanovi are useful when the seedling needs more initial volume or when the grower wants to minimize early handling. They also take more room in a tray and more potting mix, so they are not automatically better. Select the smallest block that gives the crop enough time to develop before transplanting.
Cleaning and Maintenance
Rinse soil from the mold soon after use rather than allowing it to dry into corners, pins, and ejection surfaces. A soft brush can loosen residue without scratching the metal unnecessarily. Avoid storing the tool while it is wet or packed with soil. Even coated or corrosion-resistant steel benefits from being rinsed, dried, and kept away from standing water.
Before the next session, check that the pins remain secure and that the release mechanism moves freely. Look for bent edges, loose fasteners, or soil buildup that could interfere with block separation. Handmade steel tools may show cosmetic marks, but functional damage deserves attention because a distorted mold can produce uneven cubes or make release more difficult.
Storage and Long-Term Ownership
Store a blocker in a dry location with the working surfaces clean. Keep removable pins together with the tool so the correct sizes are available when seed-starting season begins. A labeled container is particularly helpful for the three-pin handheld models, since mixing pin sets with unrelated garden hardware can lead to misplaced parts.
For a stand-up Multi 20, allow enough storage height and floor space before buying. Its upright format is helpful during use but less convenient to tuck into a crowded cabinet. Handheld models are easier to carry between indoor and outdoor work areas. Whichever style you choose, avoid dropping the mold or using it to break hard, dry soil; these tools are intended to compress prepared mix, not replace a digging tool.
Common Mistakes to Avoid with Soil Blockers
Most poor results come from a mismatch between the tool, the mix, and the planting plan rather than from the basic idea of soil blocking. Avoid rushing the first batch, especially with small cavities or a new seed-pin arrangement.
- Using dry mix: Blocks may crumble, split, or release unevenly.
- Using chunky ingredients: Twigs and stones can stop small cavities from filling.
- Overwatering: A muddy mix can smear onto the mold and lose its shape.
- Choosing capacity without considering crop mix: Twenty cells are less useful if every variety needs a separate small batch.
- Picking the wrong block size: Large blocks waste space for tiny seeds, while tiny blocks may restrict vigorous seedlings.
- Forcing a stuck mold: Recheck moisture, fill, and release technique instead of applying damaging leverage.
- Storing the tool dirty: Dried residue can interfere with pins and ejection.
Compatibility with Trays, Flats, and Transplanting
Soil blocks still need support. A tray or flat catches released cubes, keeps them organized, and makes watering and movement easier. Choose a receiving tray with enough room for the selected block dimensions rather than assuming a standard seed tray will fit every format. Twenty 3/4-inch cubes and twenty 1.5-inch cubes occupy very different amounts of space.
Transplanting is one of the main reasons gardeners choose soil blocks. Because the seedling is not pulled from a plastic pot, there is less need to pry around the root ball during the move. The Ladbrooke nesting system adds another compatibility advantage by allowing Micro 20 blocks to move into Mini 4 blocks. Other tools can still be transplanted effectively, but their product data does not identify a matching larger-block system, so buyers should plan their next container or bed transition separately.
Which Soil Blocker Fits Which Gardener?
- Large garden or greenhouse: Choose the Ladbrooke Multi 20 when twenty 1.5-inch blocks and a stand-up workflow match your volume.
- Fine-seed specialist: Choose the Ladbrooke Micro 20 for twenty 3/4-inch blocks and possible nesting into Mini 4 blocks.
- Flexible home grower: Choose BlumWay when eight two-inch blocks and three pin styles provide the right balance.
- Small-batch beginner: Choose NVRGIUP when four two-inch blocks, a round handle, and three pin sizes are enough.
- Compact durable alternative: Choose nanovi for a zinc-coated four-cell tool with multiple pins and a simple operating sequence.
FAQS About Best 20 Cell Soil Blocker
What is the best 20 cell soil blocker for large gardens?
The Ladbrooke Authentic Multi 20 is the strongest fit among these selections for larger gardens because it creates twenty 1.5-inch blocks per press and uses a stand-up, long-handle format. It is better suited to repeated production than a handheld four-cell model.
Is a 20-cell soil blocker good for fine seeds?
Yes, but the block dimensions matter. The Ladbrooke Micro 20 makes twenty 3/4-inch blocks specifically suited to fine seeds such as lettuce, basil, parsley, celery, and small-seeded flowers. A 1.5-inch or two-inch mold may be unnecessarily large for some of these crops.
What size soil blocker should I use for seedlings?
Use the smallest size that gives the crop enough room before transplanting. Three-quarter-inch blocks suit early fine-seed starts, 1.5-inch blocks offer a versatile middle option, and two-inch blocks provide more initial root space for larger or longer-held seedlings.
Does the Ladbrooke Micro 20 work with larger blocks?
The supplied product information states that Micro 20 blocks nest directly into Ladbrooke Mini 4 blocks. This allows the seedlings to move into a larger compatible block without repotting and without the same degree of root disturbance.
Are handheld soil blockers suitable for greenhouse use?
Yes. BlumWay, NVRGIUP, and nanovi are all portable handheld options that can be used in greenhouse settings. Their main limitation is output: four or eight blocks per press may take longer than a stand-up twenty-cell tool for a large planting schedule.
Why do soil blocks fall apart when removed?
The most common causes are insufficient moisture, inconsistent mixing, coarse ingredients, or inadequate compression. Prepare a fine, evenly damp mix and make a small test batch before producing a full tray. Release the blocks onto a supporting flat rather than lifting them individually right away.
Final Thoughts
The best 20 cell soil blocker for high-volume, general-purpose work is the Ladbrooke Authentic Multi 20 Commercial Soil Blocker. Choose the Ladbrooke Micro 20 for fine seeds and nesting compatibility, or the BlumWay Soil Blocker for a portable eight-cell, two-inch format. Together, those three cover the clearest needs: production speed, fine-seed efficiency, and flexible home-garden use.
I’m Maya L. Greenwood, a lifelong plant lover who believes anyone can grow something beautiful with the right guidance. After years of testing soil mixes, pruning methods, irrigation tricks, and pest-safe solutions, I started EasyGardenTips.com to turn hard-won lessons into step-by-step advice. From seed starting and container gardens to composting and seasonal checklists, my goal is to make gardening simple, sustainable, and fun.
