I have overwintered lots of seedlings. My penstemon are about 5 inches tall but a little straggly. Should I nip out the top? when should I pot on? Any advice would be helpful.
I am always nipping out the tops of most things I overwinter, including penstemon. I did cuttings, but I expect the same applies to seeds. I am guessing that they are already in pots, so you can pot them on when you see the roots coming out the bottom.
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