Do not ask me about shamrock. I spend half of the Summer months removing it from the garden. It sprouts up everywhere in the flower beds. It might be something lucky for leprachauns and the irish, but for a Brit exiled in the wilds of Switzerland, it is a pest. The only thing I am glad about is that it possesses weak roots: just a sharp decisive pull and it is gone. However, in the meanwhile, before you actually notice it is there, it has flowered and spread its seeds for the next battle. Shamrock, oh yes very pretty, but you can have too much of everything.