Had this discussion with an instructor for the NOFA Certification classes, no less, where he referred to black locust (
Robinia psuedoacacia) as an invasive...
While it has been pushed south by glaciation, and is returnng to this area in a fairly agressive way, the fact that it is in the fossil record, pollen and seed, makes an invasive categorization pretty shaky. Plus this is a nitrogen fixing tree, and we all know the value there...
Paul has a cool video about them and there is this whole other thread
here... We have a tendency to bring our personal prejudices to bear in the assignations we place on plants, good, bad, weed, herb, garden plant, invasive, etc. When a plant shows use, aesthetic or herbal, and finds it's way without challenging the other plants around it, or making a uneven impact on the ecosystem it resides in, we should cut it some slack. When it is native, we might even give it a little more room to move. When the plant shows signs of impinging on its neighbors and imbalancing ecosystems, we should give it a wide berth, not matter how useful or pretty...
HG