Troubleshooting
California Fawn Lily problems — and how to fix them
California Fawn Lily (Erythronium californicum) 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.
Corm failure to establish
Corms dry out rapidly after lifting and will fail if planted dry. Always source from reputable suppliers storing corms in damp medium; plant immediately on receipt, 8–10 cm deep, in already-moistened soil.
Summer corm rot
Wet summer soils during dormancy cause fungal rot. Position under a deciduous canopy that naturally reduces summer rainfall reaching the soil, or mix coarse grit into planting areas to improve drainage during the dry season.
Vine weevil larvae
The white grubs of vine weevil feed on corms underground, causing plants to collapse during the growing season. Apply pathogenic nematodes (Heterorhabditis bacteriophora) to the soil in early autumn when soil is still warm.
Prevent california fawn lily problems before they start
Most california fawn lily issues are care-mismatch, not bad luck. Dial in the basics:
California Fawn Lily problems — FAQ
Why is my california fawn lily corm failure to establish?
Corms dry out rapidly after lifting and will fail if planted dry. Always source from reputable suppliers storing corms in damp medium; plant immediately on receipt, 8–10 cm deep, in already-moistened soil.
Why is my california fawn lily summer corm rot?
Wet summer soils during dormancy cause fungal rot. Position under a deciduous canopy that naturally reduces summer rainfall reaching the soil, or mix coarse grit into planting areas to improve drainage during the dry season.
Why is my california fawn lily vine weevil larvae?
The white grubs of vine weevil feed on corms underground, causing plants to collapse during the growing season. Apply pathogenic nematodes (Heterorhabditis bacteriophora) to the soil in early autumn when soil is still warm.