How best dry blackberry leaves preserving the medicinal value?

Do wild blackberry foliage keep their therapeutic value when dried in a dehydrator, or is it best to dry naturally?

I’m having some severe health problems right now and finding that the wild blackberry leaf tea is effective wonders so have picked a huge batch to dry now.

Also, if you know, I read that the foliage are most heady if picked before or when the plants are blooming. Is there any merit to that?

Thanks very much in advance.

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