I have started using rings (often made of plywood !) to grow my indoor tomatoes. The advantages are that I can put fresh 'good' soil mixture in the rings each year without changing the whole of the soil in the poly tunnel/greenhouse. The plants use the lower soil for a water source and the upper roots feed from the manure etc in the ring mixture (my mixture is about equal parts leaf mold, well rotted compost, good soil, and a little wood ash) I grow other things in the bed around the rings (salad, climbing beans etc)
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