Troubleshooting
Iron Butterfly Tiarella problems — and how to fix them
Iron Butterfly Tiarella (Tiarella 'Iron Butterfly') 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.
Leaf scorch
Marginal browning signals too much sun or dry soil. Move to deeper shade and keep the root zone evenly moist with mulch.
Crown rot in wet winters
Poorly drained soil rots the crown during cold, wet spells. Plant in well-drained humus-rich soil and avoid standing water.
Powdery mildew
Crowded, humid, still-air sites encourage mildew on the leaves. Improve spacing and airflow and water at the base, not overhead.
Fading leaf blaze
The dark central marking is strongest in good dappled light; in deep shade the contrast dulls. Give brighter (still indirect) light to keep the pattern bold.
Prevent iron butterfly tiarella problems before they start
Most iron butterfly tiarella issues are care-mismatch, not bad luck. Dial in the basics:
Looking for iron butterfly tiarella in general rather than its problems? Read the full iron butterfly tiarella care guide — light, water, soil and feeding.
Iron Butterfly Tiarella problems — FAQ
Why is my iron butterfly tiarella leaf scorch?
Marginal browning signals too much sun or dry soil. Move to deeper shade and keep the root zone evenly moist with mulch.
Why is my iron butterfly tiarella crown rot in wet winters?
Poorly drained soil rots the crown during cold, wet spells. Plant in well-drained humus-rich soil and avoid standing water.
Why is my iron butterfly tiarella powdery mildew?
Crowded, humid, still-air sites encourage mildew on the leaves. Improve spacing and airflow and water at the base, not overhead.
Why is my iron butterfly tiarella fading leaf blaze?
The dark central marking is strongest in good dappled light; in deep shade the contrast dulls. Give brighter (still indirect) light to keep the pattern bold.