I've been thinking long and hard about what sort of smallish tree I can plant in my smallish back garden that won't cause a problem for the house in 10 years or so. Meanwhile I notice, in a twitchy sort of way, that my neighbour appears to have planted a WILLOW tree next to her new pond, which is about 20 ft from my house. Advice please! I love trees but know that willows are just about the worst thing to plant in a back garden but don't want to fall out with neighbour...