Zone 5b-6a? If your nighttime temps are 45-55 that is a bit chilly. Slows growth as
mentioned.
Are you in pots or in the ground? I'm guessing still in pots being seedlings.
I look for night temps in the 55-60 range, looking at a 10 day forecast, the week before
my frost free date, before hardening off.
We have had some very warm weather but past experience keeps me from jumping 'the gun...sure enough we have a week ahead of rain and dips down to high 30's, low 40's.
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