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Gerd,The Viola purpurea group, as well as V. tomentosa, V. lobata ssp. lobata, and V. pinetorum ssp. pinetorum, certainly have their cultivation challenges. To date, I can keep most forms of Viola purpurea going for 1 to 3 years at the best. I have yet to grow on any second generation seedlings from my own stock. I have had no success with Viola tomentosa, V. lobata ssp. lobata, or V. pinetorum ssp. pinetorum. There are some very beautiful plants within these species and there is considerable variation within some of the species. With a well thought out plan and persistence I hope to eventually have success. I have to admit that I admire the work of Gerhard Domagk, and others, during the late 1920’s and 1930’s at Bayer. I strongly believe with similar dedication, organization, and persistence new forms of these western Viola species can be created that are much easier to cultivate and enjoy.Some of our other dry-land Viola species have been much easier to cultivate. Viola sheltonii grows fairly easily if the proper cultural conditions are met. Viola bakeri and V. douglasii are even easier.At some later date I will report on my progress with our local mesic Viola species, V. adunca ssp. adunca, V. glabella, and V. macloskyi.
It is good to see the Western Violets in their habitat and your cultivation efforts Robert!Happy to hear that douglasii and bakeri are not fussy because I have young seedlings. V. macloskeyi grows very well here in part-shaded/moist locations.
Thanks to Gabriela and Robert (again)!@ Gabriela: I guess the distribution you mentioned is for var. bellidifolia while the species has a wider range in the US.Some time ago a friend sent me seeds of adunca from the East.Gerd
GabrielaThe plan is to keep posting photographs of our local California native Viola species on this thread this summer.For the general information of the readers out there, Viola bakeri is a high elevation species. Freezing soil temperatures and abundant snow cover are normal in their preferred habitat. For a “dryland” species, soil moisture levels do not drop to extremely low levels in their preferred habitat.Viola douglasii is a low elevation species. Freezing temperatures do not penetrate into the soil below 5-10 cm for the most part. High daytime summer temperatures in the 35-40 C range are a frequent occurrence. Soil moisture levels are extremely low during the summer and early autumn.It is important to take these distinctions (and others) into consideration when attempting to grow these species.