Diana, Have you changed the covering on your greenhouses recently? Could you be seeing the resulting effects of reduced light transmission and/or altered light quality caused by aging polyethylene? Nathan At 08:44 AM 5/12/2015, you wrote: >Hi Jane: > >I don't know about soil, but some of my bulbs definitely change >color from year to year, and I am certain it is not from stray >seedlings finding their way into the pots. Color intensity of >Triteleia laxa changes, but the most dramatic color differences have >been in Rhodophiala. I have a pot of R. chilensis grown from seed >that were clear red, and were identified as such when I got the seed >from Flores and Watson. The original bulbs are still with me, but >this year and last year they are yellow diffused with red >throughout. There is no sign of virus or any other problem. Oxalis >flower color can change quite a bit. At first I thought it was from >seeding from adjacent pots producing new colors, but I now see that >they actually change, not just in intensity, but also hue. The soil >is not a factor here, I have them in the same mix, but temperature >varies from year to year, and that could be a factor. Some colors >seem to have 'evolved', changing gradually each year until they >hardly resemble the original picture I have of them (Oxalis obtusa >Peaches & Cream, is, unfortunately, one of these). > >Diana >Telos