What to Grow from Seed in the Greenhouse Over Winter
Matt W · 10th Sep 2015
Things will grow very slowly if at all in December and January. Not so much because of the temperature but because the length of the day is at its shortest around the winter solstice (21st December). They will be gathering their energies ready to leap ahead come February when the days noticeably lengthen so long as the greenhouse is at least frost free.