Posted: 11/06/2012 at 10:43
I always water mine from the top and never have problems doing it. Mine are in pots in an unheated green house. I never put them there until temperatures are favourable i.e. above 7deg. constantly at night. The greenhouse is kept well ventilated. Are your plants in good compost and well ventilated ? As Italophile says it could be other things than temperature. In one of my books it points to Basal Stem Rot. This is caused by over watering and too much water at the base of the stem. Symptons shown are the leaves wilting and the plant collapsing. Hope this is of some help.