Chickweed flips bird to containment attempts by rooting in nothing

Volunteer chickweed plants set up shop on the roof surface. Another example of native plants thriving in a harsh environment, and why I often consider abandoning high maintenance cultivated varieties. Chickweed doesn't mind the shade, is an effective natural mulch, tastes like fresh corn, is prolific and adds an interesting dimension to salads. Here's a link to an article about chickweed treating ulcers, and other city ailments. http://www.livestrong.com/article/507579-chickweed-used-for-stomach-inflammation/