3 is too small. 5 might be too big, but it does leave room for growth. Give 4 a go. When u harvest, pull the remainder of the plant from the pot and check the root ball. Is there room left over or is it a tight mess? Then you can make the decision based on your findings for your self. What works for me might not work for u. You’ll have a better idea for the next round.
The garden sage says Don’t grow small flowers. So prune for a bigger flowers.
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