Thanks everyone!
I think Auggie's link explains a lot. Obviously the one I've got from the Garden Center won't work for cats, so I don't need to grow it. Now I only hope that I'll able to find seeds of nepeta cataria over here in Europe!

Kirsten

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www.lunas-little-world.de.vu
www.cats-in-the-net.de.vu
www.pet-cemetery.de.vu