From what i have read, c purpurea is a cross between c.graffithi and c.cordata v cordata. It has a genetically defective pollen and no fruit is observed from this crypt. However, it is pretty easy to propagate them in the aquarium.
I've got three of them growing emersed in soil/sand/profile and they're doing just great. I would guess that treating them like most other crypts in the aquarium will produce results.
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