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