Troubleshooting
Iron Butterfly Foamflower problems — and how to fix them
Iron Butterfly Foamflower (Tiarella 'Iron Butterfly') 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.
Vine weevil
Adults notch leaf margins; grubs attack roots and can kill plants outright. Apply parasitic nematodes (Steinernema kraussei) to moist soil in late summer or early autumn as a biological control.
Slugs
Slugs are attracted to the soft emerging growth in spring. Use iron phosphate-based pellets, beer traps, or biological nematode treatments; check under pots and debris where slugs shelter by day.
Prevent iron butterfly foamflower problems before they start
Most iron butterfly foamflower issues are care-mismatch, not bad luck. Dial in the basics:
Iron Butterfly Foamflower problems — FAQ
Why is my iron butterfly foamflower vine weevil?
Adults notch leaf margins; grubs attack roots and can kill plants outright. Apply parasitic nematodes (Steinernema kraussei) to moist soil in late summer or early autumn as a biological control.
Why is my iron butterfly foamflower slugs?
Slugs are attracted to the soft emerging growth in spring. Use iron phosphate-based pellets, beer traps, or biological nematode treatments; check under pots and debris where slugs shelter by day.