Troubleshooting
Black Scallop Bugle problems — and how to fix them
Black Scallop Bugle (Ajuga reptans 'Black Scallop') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Crown rot
Wet, poorly ventilated conditions invite Phytophthora and Botrytis crown rot. Thin dense mats every 2–3 years, improve drainage, and avoid waterlogging. Remove and dispose of any blackened, mushy crowns immediately.
Foliage greening
In deep shade or with excess nitrogen, the near-black leaves may revert toward green, reducing ornamental value. Ensure at least some indirect light reaches the planting and avoid high-nitrogen feeds.
Slugs and snails
The dense, low foliage provides ideal shelter for slugs, which chew ragged holes in leaves. Apply iron phosphate pellets in spring and autumn, or use physical barriers such as copper tape in containers.
Prevent black scallop bugle problems before they start
Most black scallop bugle issues are care-mismatch, not bad luck. Dial in the basics:
Black Scallop Bugle problems — FAQ
Why is my black scallop bugle crown rot?
Wet, poorly ventilated conditions invite Phytophthora and Botrytis crown rot. Thin dense mats every 2–3 years, improve drainage, and avoid waterlogging. Remove and dispose of any blackened, mushy crowns immediately.
Why is my black scallop bugle foliage greening?
In deep shade or with excess nitrogen, the near-black leaves may revert toward green, reducing ornamental value. Ensure at least some indirect light reaches the planting and avoid high-nitrogen feeds.
Why is my black scallop bugle slugs and snails?
The dense, low foliage provides ideal shelter for slugs, which chew ragged holes in leaves. Apply iron phosphate pellets in spring and autumn, or use physical barriers such as copper tape in containers.