Native plants for a Cape Cod garden

This perennial native to eastern North America prefers dry open woodlands, and does well in Cape Cod soil. The plant reproduces by seed, but it can form dense colonies from its rhizomatous root system. It can actually be fairly agressive and crowd out other plants. I can be somewhat messy – I’ve had to stalk some of the plants this year because heavy rain and wind easily flattens the stems (the wet weight of the flowers is most likely contributing to this). I’m hoping they’ll eventually grow dense enough to keep one another facing upright. The flowers are visited by a series of insects and the seeds are a favorite of birds. Rabbits can take a liking to the foliage, but in my yard they have found tastier fare and have left the woodland sunflower be, at least so far.