I read, that they grow very easily from seeds. I got my plant from my neighbor, who doesn't like them too much, and they grow like crazy. Started nice and slow, and now are popping up within my whole little garden space, so keep that in mind. Worse than blackberries. However, leaves are edible, and people have made great healing tinctures from the whole plant, including
roots (good for liver, if I recall correctly), so I do not mind, I just cut them or pull them.
Sorry, I am in US, otherwise I would gladly let you take as many rootlings as you want.