Black Scallop was first observed as a natural mutation of Ajuga reptans ‘Braunherz' in 1998.
Ajuga can become an invasive weed, especially the green species plant. They can jump out into the lawn and will over run other plants in the garden. Thinning may be needed to prevent spread. This plant is also called Bugle Weed
Notes & Reference
#04-Herbaceous Perennial Plants (Allan Armitage), #68-Groundcovers for the Midwest (Voight, Hamilton, Giles)