Middleton Public Lands has received complaints from joggers and other trail users about piles of garlic mustard being placed on the gravel portion of the trail. If you're birding there and you want to pull garlic mustard, bag it and take it out with you when you leave ― do not leave it anywhere on the path! Plus, just leaving it there merely helps spread garlic mustard as the pulled plants will still go to seed.
Link: More about Garlic Mustard at Pheasant Branch Conservancy