Please be aware of local native plant populations when using this concept. In much of the US some species of willow and buckthorn are invasive, can out-compete native plants, and can result in a drastic reduction in local biodiversity. I recommend Doug Tallamy's books Bringing Nature Home and The Nature of Oaks for anyone interested in native plant info. The writing is targeted at the US, but they're easy reads and have a lot of good info.