Soil Blocking : A Sustainable Way to Start Seeds
While plastic trays and pots are perhaps the most common way to start seeds, more growers are turning to a simple, sustainable alternative: soil blocking. This method not only reduces waste but also produces strong, healthy seedlings well-suited for the varied conditions across the Natural State.
What Are Soil Blocks?
Soil blocks are exactly what they sound like—compressed cubes of soil formed using a handheld or stand-up blocking tool. These blocks eliminate the need for plastic containers and come in a range of sizes, typically from ¾-inch “micro” blocks for tiny seeds up to 4-inch blocks for larger transplants.
Advantages of Soil Blocking
One of the biggest benefits of soil blocking is the development of healthier root systems. As roots reach the edge of the block, they are naturally “air-pruned,” preventing them from circling or becoming root-bound as they often do in traditional pots. This results in sturdier plants that establish more quickly once transplanted.
Transplanting itself is easier and less stressful on plants. Since there’s no container to remove, the entire block goes straight into the soil, minimizing root disturbance and reducing transplant shock. This can be especially valuable during Arkansas’ unpredictable spring weather, when plants need every advantage to adapt quickly.
Soil blocking is also an eco-friendly and cost-effective option. By eliminating disposable trays and pots, you reduce plastic waste significantly. While there is an upfront investment in a soil blocker, high-quality tools can last a lifetime, making them a worthwhile addition to any homestead.
Another advantage is space efficiency. Soil blocks can be packed closely together, allowing you to grow more seedlings in a smaller area—perfect for those working with limited indoor growing space.
Finally, soil blocking makes “potting up” simple. If you use multiple block sizes, you can place a smaller block directly into a larger one as the plant grows, avoiding the need to handle delicate roots. For instance, if you start your seeds in 3/4-inch blocks, you can use a 3/4-inch seed seed pin in a 2-inch block allow you to “step up” to the size block to allow you more time to prepare your seedlings for transplant.
Disadvantages to Consider
Despite its benefits, soil blocking does come with a few challenges. Because all sides of the block are exposed to air, they dry out much faster than soil in plastic containers. This means frequent monitoring and often daily watering, particularly in Arkansas homes where indoor air can be dry in late winter.
There is also a learning curve. Getting the soil mixture just right is critical—it should have a thick, “brownie-like” consistency. Too dry, and the blocks will crumble; too wet, and they may not hold their shape or could develop mold.
The initial investment can be another drawback. Quality soil blockers, such as those made by Ladbrooke, can range from around $45 for small handheld tools to several hundred dollars for larger, commercial-grade models.
Soil blocks are also more fragile than traditional containers. They require gentle handling and careful watering from below, as overhead watering can erode the blocks and damage seedlings.
Lastly, the setup process is more time-intensive. Forming each block by hand takes longer than simply filling a tray with potting mix, which may be a consideration during the busy seed-starting season.
How to Make Soil Blocks
Creating soil blocks is straightforward once you get the hang of it:
- Prepare Your Soil Mix – Use a high-quality potting mix or create your own blend. Many homesteaders prefer mixes that include compost, peat or coco coir, and a fine texture for better compression. There a plenty of recipes online. Put your mixture in a bin larger enough for you to compress the soil with your blocking tool.
- Add Water – Moisten the mix until it reaches a thick, sticky consistency—similar to brownie batter. This step is key to forming solid blocks.
- Fill the Blocker – Press the soil blocker firmly into the wet mix. Twist or wiggle the tool slightly to ensure each cavity is tightly packed. Keep repeating until the blocks are filled.
- Eject the Blocks – Place the blocker onto the tray where you intend to start the seeds and squeeze the handle to release the formed blocks. Most blockers create a small indentation on top, perfect for placing seeds.
Is Soil Blocking Right for Your Homestead?
Soil blocking offers a practical, sustainable way to start seeds, especially for homesteaders looking to reduce waste and grow healthier plants. While it requires a bit more attention and practice – especially in getting the soil moisture right – many growers find the benefits outweigh the drawbacks.
For Arkansas gardeners dealing with fluctuating spring temperatures and limited indoor space, soil blocking can be a valuable technique to add to your seed-starting toolkit since blocked starts can easily by placed into a larger block or container until transplanting. With a little patience and practice, you may find it becomes your preferred method.
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