Troubleshooting
Cusp Blazing Star problems — and how to fix them
Cusp Blazing Star (Liatris mucronata) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Corm rot
The most common cause of plant failure; caused by Fusarium or Pythium in waterlogged or heavy clay soils. Ensure sharp drainage and avoid overhead irrigation — there is no cure once the corm is rotted.
Aphid infestations
Colonies of aphids may cluster on flower spikes in early summer, distorting buds and leaving honeydew that encourages sooty mould; a strong jet of water or insecticidal soap spray controls minor outbreaks.
Prevent cusp blazing star problems before they start
Most cusp blazing star issues are care-mismatch, not bad luck. Dial in the basics:
Cusp Blazing Star problems — FAQ
Why is my cusp blazing star corm rot?
The most common cause of plant failure; caused by Fusarium or Pythium in waterlogged or heavy clay soils. Ensure sharp drainage and avoid overhead irrigation — there is no cure once the corm is rotted.
Why is my cusp blazing star aphid infestations?
Colonies of aphids may cluster on flower spikes in early summer, distorting buds and leaving honeydew that encourages sooty mould; a strong jet of water or insecticidal soap spray controls minor outbreaks.