Oplopanax horridus


I wonder if anyone has any experience from propagating Oplopanax horridus from seed. I tried different methods this past season, but were unsuccessful in all of them. I tried outdoor treatment, treatment with gibberellic acid ( GA-3 ), and K-nitrate, as well as a mix of both. Maybe the seeds were just too old. I don't know how long the seeds are viable.Would appreciate any hints.


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