Buddleja

Discovered in Yichang and brought to Europe as an ornamental plant it has now been deemed an invasive species in many countries. It's a good food source for many butterflies which is a good thing given considerable loss of habitat due to agricultural changes. And pretty to see in town as it colonizes did used buildings. However the roots will force stones apart and cause structural damage and eventual failure. I cringe when i see buddleia on a high chimney and talk a wide berth.

Done