A “soil block” is a square of potting soil that is compressed into a mold forming a block. It is a method of indoor seed starting. Instead of using container to contain the soil as is usually the case with starting seeds indoors, the compressed soil serves as both the container and the soil medium all in one!
Usually roots will encircle a container once they reach a certain size. With a soil block, instead of roots encircling a container, they are “air-pruned”. This allows for a seamless transplant with virtually no transplant shock.Read More