I grow the Arum spp. Arnold mentions, and some others. I had them directly planted in raised beds in my covered but unheated bulb house, but they take too much room and I've been trying to remove them to a shrubbery at the back of my garden, where they flourish. As another member mentioned, they are winter-growing, and here they do well down to at least 20 degrees F. Given their rather uninteresting flowers, there seems little reason to grow them in pots under lights, but to each his own. I am keeping a good yellow form of A. creticum under cover, and a couple of forms of A. dioscoridis, but there are a lot of seedlings of the latter growing where I threw out a stem of seeds a few years ago, and they grow right through snowfall. A. dioscoridis is the one with the huge spathe strongly marked with dark blotches and spots. I haven't donated Arum seeds to the Bx/SX because it's difficult to clean off the soft matter; they have to be soaked and then rubbed, and one has to wear latex gloves to do that. If I come up with some tubers, though, I can donate those if there is interest. Jane McGary, Portland, Oregon, USA On 1/21/2020 7:20 AM, Arnold Trachtenberg via pbs wrote: > I've had these Arums for a number of years. A. palaestinum, A. korolkowii and an Arum I was given by a colleague in Puglia, Italy. > The soil has been changed and pots sterilized more than once. > I feed with an organic fertilizer Down to Earth which is a blend of organic components. > I have them under some T-5 LED lights in a cool greenhouse not below 45-50 F. > Any suggestions would be most appreciated as to how to correct this condition. > > _______________________________________________ pbs mailing list pbs@lists.pacificbulbsociety.net http://lists.pacificbulbsociety.net/cgi-bin/…