Who is growing Y. elata x filamentosa (not Y. filamentosa x elata)? Can you post photos? I'd like to see the difference between Y. eltosa and Y. filata. Thanks.
I know that there is a hybrid called Y. elata x concava from Hungary. Unfortunetely my plant ist death. Maybe that one of our guys have this plant and it is still growing on.
take care Horst
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