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Ha! Leave it to @InTheShed to ask the most (imho) salient question to be asked! No! She began in the full pot setup from sprout but no water. I estimated the amount of time it took before the roots would reach the plate at the bottom of the lower pot. Until then I watered the top pot, and when I began to see roots at the base of the upper pot I started to water the lower pot too. Then I went to the mountains. Still no water. The day I got back I filled the reservoir. From that point on, whatever week of the PB feed chart we were on is what the reservoir was filled with. I changed the water completely about once a week. I let the runoff from watering up top just go into the reservoir each feeding and topped off the res as required. That’s it in a nutshell. But your question, I think, is THE determinant factor in the eventual size of the plant. What if the upper pot was small and she had water way earlier? Or is starting it approximately right at the veg/flower transition (that’s what happened here) the best call? See what I mean? Excellent question, thanks very much!Terrific and successful experiment! Was the bottom half of that lower pot submerged in water the entire time?