top of page

Discover the Benefits of Soil Blocking for Seed Starting

  • Jane Westoby
  • Apr 23
  • 3 min read

Updated: May 6

If you've ever found yourself overwhelmed by trays, transplant shock, or the endless hunt for sustainable growing methods, soil blocking might just be your new favorite technique. It’s eco-friendly, efficient, and surprisingly satisfying once you get the hang of it. Here’s everything you need to know to get started.


Two green soil block makers on a wooden surface. Background includes a wooden shelf with a pot and tools. Rustic and earthy setting.

🌱 What is Soil Blocking?


Soil blocking is a seed-starting method. It involves compressing dampened compost into block shapes using a special tool. These blocks hold together without trays or pots. They create a self-contained growing space for each seed. The result? Neat rows of little compost "brownies." These are gentle on roots and easy to transplant.


🌿 Why Choose Soil Blocking?


Soil blocking offers several advantages.


  • Eco-Friendly: Say goodbye to plastic trays and hello to compost-only planting. This method reduces waste and promotes sustainability.

  • Healthier Seedlings: Blocks naturally air-prune roots. This prevents root circling and encourages stronger, more compact plants.

  • Space Efficient: When using smaller blocks, you can fit many into a single tray or recycled container. I swear by large strawberry punnets!

  • No Transplant Shock: Because you’re not disturbing the root system, plants transplant easily and thrive quickly in the garden.

  • They are quick and easy to prick out. No more trays of dread.


🌱 What You’ll Need


To get started with soil blocking, gather the following items:


  • A soil blocker tool (available in various sizes)

  • Quality compost (Jane recommends using it straight out of the bag—no fancy mixes required)

  • A flat tray or recycled container to place your blocks on

  • Water to moisten your compost


🌿 Step-by-Step Guide


Here’s a simple guide to making your own soil blocks:


  1. Moisten Your Compost: You want it wet enough to hold together but not sloppy. It’s best to use gloves for this step!


  2. Load the Compost: Wiggle the blocker tool back and forth over the wet compost. Push down to pack the compost into the blocks.


  3. Press and Release: Place the loaded soil blocker over the tray. Press down firmly on the handle and then release the blocks onto your tray.


  4. Sow Your Seeds: Place one seed per block. Use a toothpick for tiny seeds like Snapdragons or China asters.


  5. Label Everything: Mystery seedlings might be cute, but they won’t help your crop planning.


  6. Water with Care: Soil blocks can dry out quickly. Keep them moist but not soggy.


🌿 Common Challenges


While soil blocking is rewarding, it can present challenges. Here are common issues and how to tackle them:


  • Crumbly Blocks: If your blocks crumble, the compost might be too dry or not compacted enough. Adjust by adding more water or compacting the compost more firmly.

  • Overly Wet Blocks: If your blocks become soggy, reduce water during the initial mixing.


🌱 Tips for Success


Here are additional tips to make your soil blocking successful:


  • Practice makes perfect! Your first few blocks may not look perfect, but you’ll improve quickly.

  • Ideal for small and medium seeds. Larger seeds like sweet peas or courgettes are better suited to pots.

  • Place under a propagator lid to help retain moisture. A heat mat will help speed up germination.


💚 Final Thoughts


Soil blocking isn’t just a trend. It’s a mindful, sustainable way to start your seeds. It aligns with eco-friendly values and helps create a productive garden. Grab your blocker, some compost, and a touch of patience, and give it a try.


Happy sowing!


Discover More Resources


Read more of our guides:

Comments


bottom of page