I have found Lombardy poplars growing from the Upper Peninsula of Michigan to the desert southwest ,Phoenix, AZ,. Northern California and Nevada are laced with lombardies. The 6 foot lombardies I purchased in February are now ,at the end of the Phoenix, AZ growing season, about 10-12 feet tall. A great fast-grower for screening a fence line or as a windbreak. Very popular with many species of birds. You can find lombardies as specimen trees