I started some cactus dahlias from Thompson and Morgan seed with almost 100% germination. I have the now 4 inch seedlings under my flourescent lights. they really need more room ( and I need more room as I start more flower and herb seeds!). What are the minimum night temps they can take without affecting growth and future flowering. I have a new greenhouse that I now have my pansie and sweetpea seedlingas in..days up to 80 and nights down to 40. Do you think this would be ok? I tried this on a google search, but could only find minimum temps for wintering over. Thanks!