I see new invasive plants every year. I think it comes from the landscaping and gardening industry, right over my neighbors' fences. The Nipplewort showed up about 3 years ago. It looked like it would take over everything, but it's calmed down. And it's good to eat. If only every invasive species was like that. If you do see the Poison Hemlock, I'd appreciate you letting me know! It will be in disturbed ground more than the woods. Your garlic mustard problem is enough for your poor woods!
RE: Fruits and Veggies Monday - Tips and GIFs for Harvesting Edible Weeds From a Garden Rehab - 11 Edible Weeds and 1 That Can Kill You!