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http://herbs-treatandtaste.blogspot.com/2012/02/great-hairy-willow-herb-history-of.html?m=1
The leaves are edible and are used in Russia to make tisane, or tea, although there have been reports that the plant and leaves are poisonous. If you do use this plant for any purpose, remember that it could be toxic. It can cause epileptic-like convulsions it is said.
That's rather confusing 😕
Thanks.
Nothing glaring seems to say it's posionous.