I have the willow and the hazel, both some times refered to as Harry lauders walking stick. I have found they do sort of grow anywhere. I also have a contorted purple leafed willow, unfortunately breeders rights stops me from propagating. These trees get uprooted and potted for garden shows, stuffed back in the ground time and time again,( really big pots) but apart from not growing to their full size they seem alright. One willow that has not moved used for a few years is planted on a spot where there was a building a few years ago so it is well drained with building rubble and it has reached 15' high. I think they are as bombproof as their wild cousins.