Per acre, Elderberry is one of the best pollen sources for bees (reported at 600-800/lbs per acre.) We propagate elderberry for the benefit of our bees, but some people use the flowers and berries to make food and medicines. Frankly, I think there are better tasting wild edibles. Still, they are hardy and productive. They will fill in a blank area in no time and come back bigger each year. Ours grow wildly along all of our wetlands and we actively multiple them.
They are easy to grow by seeds or cuttings.