I loved the concept of fabric pots, and bought 10 of them. After a couple of grows though, I switched back. The reason I did was that in each and every case the stalks of the plants in the fabric plant were small/wimpy. After harvest, I would remove the stalk/root system, and it was small, wispy - no large roots, just all little shoots. When I do the same thing with plastic, the root system is robust and much more developed than those from fabric. The stalk diameter is at LEAST twice as large.
As soon as I switched back, the plants again had larger, healthier stalks. Many growers online say that the fabric pots self trim the root system, and that the larger roots from plastic are bad because they tend to form circularly in the pot. Personally, I don't care if the roots are circular, or draw doodles. I like to see a healthy stalk!!
In some forum somewhere, a contributor advised to use a larger fabric pot to get the same results as a smaller plastic pot. He believed that the self trimming of fabric pots created an unusable zone that had to be accounted for. He advised using a 5 gal fabric pot to replace a 3 gal plastic. That made sense to me, and served to cement my opinion that I did not want to use fabric any more.
At this point, I am usually getting 5-7 ozs per plant, and part of that (I believe) is because I stopped using the fabric pots.
I just harvested two plants, and filled a 5 gal pail about 2/3s full with trimmed, dank buds. I used 3 gal plastic pots from Home Depot to grow in.
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