Soil Blocks
adam February 10th, 2010
This week I placed a large seed order from Johnny’s. On their Web site I found a company-made video explaining soil-block makers. Guess what soil-block makers do? They make soil blocks, which are a medium to start seeds in. Growers usually start seeds in plastic cell flats; soil blocks eliminate them from the process. Since eliminating plastic from gardening is highly desirable to me, I added a soil-block maker to my seed order. I had to have it.

The Medium 4 Soil Blocker.
Every seedling I plant in my garden has been started by either me or a local farmer. I’m very lucky to have a friend who allows me to start my seeds in his greenhouse. He has been very generous over the years, giving me old flats to use, watering my seedlings when he waters his seedlings, even providing me with his growing mix. (If you’re a new gardener and want a greater shot at success, latch onto a kind person who knows what he’s doing.) Each year I garden I try to become more independent, though, and I hope this soil block maker will be a step in that direction.
Soil-block makers come in a variety of sizes, for home and commercial growers. Basically they act as a mold that will create a freestanding square of soil, each with a dimple on top to plant the seed. A seedling growing in a soil block never becomes root bound, because once the roots have no more space to grow in, they stop growing instead of becoming twisted and tangled (i.e. root bound), which can stunt growth. Watch the video below to see how you can transfer seedlings from smaller soil blocks to larger ones as they await their final destination in the ground.
For $30 I bought the “medium 4 soil blocker,” which makes four 2-inch square blocks. I’m also interested in buying the large soil blocker that makes one 4-inch block, but it inexplicably costs $119. I’m going to do some Googling to try and find a cheaper alternative.
I’ve never seen anyone use these before but in theory they’re very appealing. The system is better for the plants and eliminates the use of the ubiquitous cell flat. This season will be a soil-block test.
More on soil blocks in the video below, which - bonus! - also features Martha discussing cow manure.
Also check out: www.pottingblocks.com










