Now judging from the size on these you'd guess rootbound in 16 ounce cups. The secret is that there's about 2 inches of packed super hot super soil at the bottoms and they are in fact very well fed with simple coconut water.
Latest super soil batch.
This is recycled and reamended from all the way back to 2016 it has Dr earth home grown, fox farms ocean forrest, and fox farms happy frog based super soils all mixed with a bit of promix hp and amended with down to earth, biolive. Vermicrop vermikelp, Peruvian bat guano, Azomite, whole oats, alfalfa meal. Etc etc etc.
I feed the soil 2 times a week with biogrow/molases and spray down with neem oil weekly to ward off pests.
Average temp in my garage is 38 f and the soil maintains 56 degrees cooking