Hi, I've seen this heaps in other species, so I've asked this question too From memory, individual plants ability to draw chemicals such as magnesium can be a factor In changes like purple & blackish colour variations in many species of plants. It is very common on the seasonal change toward the cooler months when plants have a reduced ability to process the magnesium. This can happen in part of a single tray of seedlings & can be effected by calcium deficient mix, further reducing magnesium uptake. Someone else with more scientific knowledge than me might beable to explain that in better detail. On 19/12/2011, at 6:19 AM, The Silent Seed <santoury@aol.com> wrote: > > I think it was actually my very first BX/SX order, that I got some Amaryllis belladonna seeds -