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At Happy Hollow Park, these are invasive plants. They have been working on getting these out of the park, it seems to be fairly successful. There is a lot less of this than there could be. Notice the bush honeysuckle (
Lonicera maackii) is already starting to leaf out. In spring it gets a headstart in competition with the native plants. There doesn't seem to be much of the honeysuckle, this is just a small sprout I found. This picture was taken at Happy Hollow Park on March 18. The other plant is garlic mustard (
Alliaria petoliata). Not too bad an infestation of this but there is rather a lot of it at the high part of the main trail on the north end of the park.