Well... one single year experience, I can't give you weeks but it seemed to me if they had no space they just stayed happily small. When I moved them to 72 cell and fed them they took a big jump, when I potted up in solo cups also they seemed to get big in a hurry then stopped except every time i fed some liquid ferts, bang they'd be noticeably bigger within a few days. Heavy feeders. Don't think they need a lot of space to survive or do well, but if the pots are small, liquid ferts will grow them bigger.
If you think they're getting too big too early for your plant date, just keep em moist without fertilizer and they'll just stay as they are until ready.
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