Dear Ian, and all, I have T. sylvestris in clay both is sun and in shade, soil ph 7,8 no flowers since I've bought them (for about 5 years now), but are speading and are around 20-30 cm deep. What can be wrong? T. bakeri 'Lilac Wonder' also spreads by stolons, but not as fast as T. sylvestris. I left the bulbs at their place and bakeri moved 10 cm, sylvestris 20 or so. Bye, Jan Z5a, Hungary