Which Soil Blocker Is Right For You?
Choosing the right soil blocker depends on what you're growing and how you like to work. Here's a simple guide to help you decide.
What kind of grower are you?
Most people fall into one of these four categories — find yours and we'll point you straight to the right tool
‘I grow cut flowers from seed’
Start with small blocks. The 112 Blocker or Compact 36 will cover almost everything you grow. This is our most popular size.
‘I grow larger or fast-growing seeds — cosmos, zinnias, beans, peas’
Use large blocks. Bigger seeds benefit from more room. The Compact 9 or 28 Blocker is the one to add.
‘I sow hardy annuals in autumn, or start annuals early when they won't go outside for a while’
Consider adding thePotting On Plate and 15 Blocker. Moving seedlings into extra large blocks (instead of pots) keeps them thriving without the plastic
‘I want the complete no pot system’
The Complete Bundle gives you everything you need to go plastic free, from small block to large block.
"After some practice and sifting the soil first, my snapdragons are coming out really nice. I also started my lisianthus in the soil blocks — they're growing nicely and look really healthy."
Block Size Guide
We make three block sizes: Small, Large, and Extra Large. What changes between our tools is how many blocks they make at once, so you can choose the quantity that suits your setup.
Small
27 x 27 x 27 mm
Best for smaller seeds
Ideal for high - volume sowing
Saves Space
Available in the Compact 36 and 112 Blocker
Small is Best For:
Ammi
Snapdragons
Phlox
Amaranthus
Lettuce
Lisianthus
Large
54 x 54 x 54 mm
Best for medium, large and fast growing seeds
Allows more time to grow before transplanting
Also great for cuttings
Available in the Compact 9 and 28 Blocker
Large is Best For:
Sunflowers
Cosmos
Zinnias
Tomatoes
Peppers
Beans
Extra Large
75 x 75 x 75 mm
Pot on into these from smaller blocks
Best for Large Plants
Eliminates the need for pots
Available in the 15 Blocker
Want to know more about soil blocking?
Once your seedlings outgrow their small blocks, here's what comes next
The potting on plate allows you to transfer seedlings from small blocks into extra large blocks—without disturbing the roots.
Continued plant growth
Less transplant shock
Roots continue to benefit from air pruning
Reduces plastic waste
Popular Starter Sets
The complete Pot Free System
For growers who are done with plastic pots for good.
This is the bundle for serious growers: market gardeners, flower farmers, and estate gardeners who want a complete, professional propagation system. Whether you're a new business choosing soil blocking from day one or an established operation making the switch, the 112 Blocker handles sowing at scale and the Potting On Plate lets you move seedlings into extra large blocks when they need more room.
Faster transplanting
more seedlings per m²
no tranplant shock
no plastic.
If you're ready to commit to soil blocking as your main growing method, this is where to start.
Save money with the 112 Soil Blocker + 15 Blocker & Potting On Plate Bundle.
The 15 blocker & potting on plate is designed to take our smallest block size, into a 75 × 75 × 75 mm block, for continued growth and plant health.
You will recive:
112 Soil Blocker
Specifications
Block size: 27 × 27 × 37 mm
Number of blocks: 112
Blocker Footprint: 400 × 230 mm
15 Blocker & Potting On Plate Bundle
Specifications
15 Soil Blocker
- Block size: 75 × 75 × 75 mm
- Number of blocks: 15
- Material: Stainless steel
- Dibbles: Replaceable silicone
- Blocker footprint: 400 × 230 mm
Potting On Plate
- Stainless Steel
- 3D printed PETG inserts with brass fixings - 30 × 30 × 40 mm (PETG has better recyclability, durability, and lower carbon footprint compared to other 3D printing filaments)
Not sure which soil blocker to choose? Read the guide here
Please Note
Pre-order item: Lead time of 3–4 weeks before shipping
This bundle will arrive in two shipments
International orders: Overseas customers may be responsible for local import duties. These are not included in the purchase price.
The Beginner Set — Compact 36 + Compact 9 Bundle
For aspiring flower farmers and hobby growers who want to grow from seed the right way from the start.
This is the bundle that beginner flower farmers, hobby growers, and aspiring market gardeners keep coming back to tell us they wish they'd started with sooner. The Compact 36 gives you small blocks for flowers and fine seeds, and the Compact 9 takes care of larger seeds — cosmos, zinnias, and anything that needs a bit more room to get going. Two tools, every seed covered.
In Stock & Ready To Ship.
Start your seedlings the plastic-free way with the Bloom & Gray Compact 36 and Compact 9 Soil Blocker bundle. Beautifully simple, UK-made tools designed for gardeners, flower farmers, and allotment growers who want strong, healthy transplants from day one.
This bundle consists of our two compact soil blocker sizes, the compact 9 and the compact 36.
Compact 9
This compact soil blocker compresses your seed-starting mix into 9 perfectly formed soil blocks, each measuring 54 × 54 × 54 mm. The generous block size holds plenty of compost, helping blocks stay moist for longer, ideal for busy sowing periods when watering can slip down the list.
Designed especially for larger, fast-growing seeds such as squash, zinnias, sunflowers, and cosmos, the Compact 9 makes seed starting quick and satisfying. In just a few minutes, you’ll have 9 uniform blocks ready for seeding.
Compact 36
This compact soil blocker compresses your seed-starting mix into 36 perfectly formed soil blocks, each measuring 27 × 27 × 38 mm. Designed especially for small to medium flower and vegetable seeds such as ammi, larkspur, nigella, lettuce, radish and snapdragons.
Soil blocking encourages air pruning, meaning roots stop growing when they reach the edge of the block and naturally branch out instead. The result is dense, fibrous root systems and sturdy, transplant-ready seedlings — without the root spirals and pot-bound stress caused by plastic cell trays.
For a low-waste seed-starting setup, pair your soil blocks with reusable shallow trays that can be used season after season.
Each Bloom & Gray Soil Blocker is made in the UK from stainless steel, finished with a durable polyester powder coating for longevity and a pop of colour. Replaceable silicone dibbles press a neat indent into each block, making sowing fast and consistent.
Not sure which soil blocker to choose? Read the guide here
Included in the bundle:
Compact 9
Block size: 54 × 54 × 54 mm
Number of blocks: 9
Blocker footprint: 162 × 162 mm
Material: Stainless steel with polyester powder coating
Dibbles: Replaceable silicone
Compact 36
Block size: 27 × 27 × 37 mm
Number of blocks: 36
Blocker footprint: 170 × 170 mm
Material: Stainless steel with polyester powder coating
Dibbles: Replaceable silicone
Please Note
The coloured polyester powder coated finish is cosmetic only and may chip over time due to the nature of the product and it’s intended use. Our products are made from stainless steel which protects your product from corrosion.