Troubleshooting
Boissier's Silverbush problems — and how to fix them
Boissier's Silverbush (Convolvulus boissieri) 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.
Crown rot from winter wet
The primary threat; the rosette crown is extremely susceptible to rotting when moisture sits around it in cold weather — always plant on a slope or with a collar of sharp grit around the crown, or grow in an alpine house.
Vine weevil grubs
The compact root system makes this plant particularly vulnerable to vine weevil larval feeding; inspect roots at repotting and treat with biological nematodes or imidacloprid-based drenches as permitted.
Prevent boissier's silverbush problems before they start
Most boissier's silverbush issues are care-mismatch, not bad luck. Dial in the basics:
Boissier's Silverbush problems — FAQ
Why is my boissier's silverbush crown rot from winter wet?
The primary threat; the rosette crown is extremely susceptible to rotting when moisture sits around it in cold weather — always plant on a slope or with a collar of sharp grit around the crown, or grow in an alpine house.
Why is my boissier's silverbush vine weevil grubs?
The compact root system makes this plant particularly vulnerable to vine weevil larval feeding; inspect roots at repotting and treat with biological nematodes or imidacloprid-based drenches as permitted.