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is R. purpurea the most vigorous species? my March seedlings are already 20 cm high! but they started slowly...on the other hand, a species whose label I've lost (but fortunately you'll be there when it flowers ) sown last year is still only 7 cm high.
Herman.Do you grow any other hardy members of Zingiiberaceae?
my juvenile R. purpurea plants don't have dark stems like this one.I have Roscoea purpurea ‘Spice Island’ which has been in the ground for several years, but it no longer flowers because it is in too much shade, I think. What is the exposure Herman? Does it get any sun?