Weed/Wildflower Wednesday
Dame's Rocket - Hesperis matronalis
An invasive, tall plant with four petals and a flower cluster with alternate, sessile toothed lance shaped leaves. It is often confused with phlox, but phlox has opposite leaves and five petals for each flower.
From late May
Prohibited in Massachusetts, and yet, here it is. That's the trick of invasive plants.