Troubleshooting
Purple Paintbrush problems — and how to fix them
Purple Paintbrush (Castilleja purpurea) 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.
Transplant failure from root disturbance
The haustorial connections to host roots are extremely fragile; moving or disturbing plants almost always kills them. Sow seed directly into the growing site beside a host grass, and do not attempt to divide or repot.
Crown rot in wet soils
Waterlogged or clay soils cause rapid rotting at the root crown, especially over winter. Amend heavy soils with coarse grit or grow in raised beds with limestone rubble to replicate the calcareous free-draining native habitat.
Prevent purple paintbrush problems before they start
Most purple paintbrush issues are care-mismatch, not bad luck. Dial in the basics:
Purple Paintbrush problems — FAQ
Why is my purple paintbrush transplant failure from root disturbance?
The haustorial connections to host roots are extremely fragile; moving or disturbing plants almost always kills them. Sow seed directly into the growing site beside a host grass, and do not attempt to divide or repot.
Why is my purple paintbrush crown rot in wet soils?
Waterlogged or clay soils cause rapid rotting at the root crown, especially over winter. Amend heavy soils with coarse grit or grow in raised beds with limestone rubble to replicate the calcareous free-draining native habitat.