Ok, I haven't tried any of this yet myself but i do intend to try to make some hash with my males. If and when i get some, then i'll post the results.

I hope others do as well.

Trichomes are most heavily concentrated in the flowering buds of mature female cannabis, but smaller amounts can be found in the leaves and trim of both male and female plants. The leaves and trim are usually unpleasant to smoke and therefore discarded, but they contain upwards of 10% of the plant's total resin production, and throwing this away is a waste of potentially potent plant material.
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Cannibis Culture Magazine