Posted: 28/06/2012 at 12:34
Not sure i can help exactly, but i keep mine in a conservatory with a pretty constant temp during the day, and then bit cooler at night - had lovely flowers last years, although this year it is a bit slower growing. i keep the soil just damp and feed every 2 weeks!
Based on the weather we've been having it may be that it's not liking any variations in temp - especially if your greenhouse is not heated!
I hope it picks up as the flowers are lovely!