This research paper claims that garlic mustard roots reduce the fungi in soil which many native plants rely on to take up nutrients. They found that seedlings were negatively affected even when planted 2 years after all garlic mustard had been eliminated. This caught my attention, as I've noticed some native plants not establishing well in areas which once were covered with garlic mustard. On the other hand, some of you have found that native species spread quickly when GM is removed. Exactly which natives do you find establish well in areas which have had GM? My own experience is that trillium and virginia bluebells have not been seeding as well in those areas as in others, although my established clumps of trillium and bluebells do fine.

Here is a link that might be useful: GM Study