Soil blocking is a seed-starting technique that uses cubes of compressed soil to grow healthy, vigorous plants. It’s my go-to method for starting vegetable, flower, and herb seeds and produces a lot of seedlings without the need for plastic pots or cell packs. The cubes of soil are made using metal soil blockers which come in a variety of sizes. Soil blocking isn’t difficult but there are a few points to keep in mind to boost success. Below you’ll learn all about soil blocking and the best way to make sturdy cubes of soil for seed starting.
What is soil blocking
Soil blocking, a seed-starting technique developed and popularized by Eliot Coleman, uses small cubes of soil to grow seedlings. The block of soil is both the growing medium and the container and results in robust seedlings. The cubes are created with durable metal soil blockers that compress the growing mix into 3/4 inch, 1 1/2 inch, 2 inch, or 4 inch blocks. Depending on the dibble, the piece of plastic that makes an indentation in the top of the blocks as they’re formed, you can make soil blocks for seed starting (the rounded dibble) or transplanting (the square dibble). More on this below. I’ve had my soil blockers for many years and use them each spring and summer to produce thousands of soil cubes for seed starting.
Benefits of soil blocking
If you’re on the fence about soil blocking, let me share some of the many benefits of this seed-starting method. Here are 5 reasons to consider getting started with soil blocking:
Produces vigorous seedlings with a dense root system – Soil blocking offers more root space than cell packs or plug trays and the roots are air pruned when they reach the outside edge of the soil cube. This results in dense root growth inside
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I have given up indoor seed starting completely on several occasions. The first time it happened I was a novice gardener. I had ordered seeds of just about every plant that I saw in the garden catalogs without thinking about such practical things as gallons of potting soil, hours of daily watering, and square feet of windowsill space. It also did not occur to me to determine whether or not I had room in my garden for even a fraction of my seedlings. My chaotic efforts eventually produced some wonderful plants, but the process was so exhausting that I said: “Never again.”
This is that time of year when we take cuttings of our beloved plants. These are the indoor plants that grew too big over the summer months, the perennials we would like to increase in numbers rather than dividing, or from bringing in an entire annual plant from outside.
Recently I went to see a big garden—seven acres to be exact. It was located on some of the priciest real estate anywhere, and it was gorgeous. It took a big crew to maintain it and a big chipper shredder machine to keep it in wood chips. Needless to say, it was bankrolled by someone with a big pocketbook. It also took a lot of big-leaf plants to cover the ground. Small and delicate plants have their charms, but when you have acreage to cover, eyesores to hide, or lots to do other than gardening, big plants are the ticket.
Yes I’m 21 again! I know it’s amazing, I’ve been married for 27 years, and have two adult children aged 19 and 22, and I’m still only 21!!…..Clearly I’m older, but I’m not telling you how old I really am, you’ll have to wait until I get to the next decade to find that out. You won’t have to wait very long though.
I’ve checked the BBC weather app and it looks like we are not due anymore frost which is brilliant. This means a couple of things…..firstly Summer is very nearly here thank goodness, and secondly I can start to plant out my tender crops!! Yay!!
How to Start a Garden Journal If you've wanted to start a garden journal (or get back to using one!), check out these tips from artist and teacher, Carrie Carlson. Connect with nature with a garden journal