I've used 10, 11, 12, 14. It doesn't matter too much, some tomatoes need more space. Most of mine are 10, which gives about an 17" diameter, but lately I have made a lot more @ 12, which gives about 22" diameter. I have some smaller, made from ends or remainder of sheets, that I use for bean towers or gourds, cucumbers, whatever you need or want to keep off the ground.
Tom
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