The most winter hardiest of the yellow flowered species, having pure sulphur yellow flowers and is excellent for cutting. Sow @ 15-18°C January to February for summer flowering, pre soaking seeds aids germination, if after 4-6 weeks there is no germination transfer pots to a cool area for 2-4 weeks, after germination grow on at 14-18°C. D.semibarbatum, height 1.5m