I am new to the group, and am slowly trying to build a collection of Roscoea species and hybrids. R. purpurea grows well for me here in southern Nova Scotia, but there are very few Roscoeas available in the local nursery trade. I now have seedlings of Roscoea alpina, but am wondering if the other two species (R cautleyoides and R. humeana) ought to be exposed to moist chilling prior to germination. The alpina seedlings were planted kept in darkness, at no greater than 70F. The other two species were given the same treatment, but there is no sign yet of any growth. Perhaps I'm a bit impatient, but I'd like to be sure I am doing the right thing to insure the best chance of germination.