Troubleshooting
King of Hearts Brunnera problems — and how to fix them
King of Hearts Brunnera (Brunnera macrophylla 'King of Hearts') 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
Sun and drought brown the silvered leaf edges; plant in cool shade with shelter and keep the soil reliably moist.
Powdery mildew
Late-season grey film in dry, still air; thin congested growth, water at the base, and clear infected foliage.
Slug and snail grazing
Emerging spring leaves are vulnerable; protect with barriers or traps until foliage matures.
Slow establishment
Plants sulk if planted in dry or sunny sites; give them a moist, shaded position and they bulk up steadily.
Prevent king of hearts brunnera problems before they start
Most king of hearts brunnera issues are care-mismatch, not bad luck. Dial in the basics:
- Common brunnera macrophylla problems — the species this cultivar belongs to
- What's wrong with my plant? — the diagnosis apps compared
- King of Hearts Brunnera watering schedule
- King of Hearts Brunnera light requirements
- Best soil mix for king of hearts brunnera
- King of Hearts Brunnera temperature & humidity
- Full king of hearts brunnera care guide
Looking for king of hearts brunnera in general rather than its problems? Read the full king of hearts brunnera care guide — light, water, soil and feeding.
King of Hearts Brunnera problems — FAQ
Why is my king of hearts brunnera leaf scorch?
Sun and drought brown the silvered leaf edges; plant in cool shade with shelter and keep the soil reliably moist.
Why is my king of hearts brunnera powdery mildew?
Late-season grey film in dry, still air; thin congested growth, water at the base, and clear infected foliage.
Why is my king of hearts brunnera slug and snail grazing?
Emerging spring leaves are vulnerable; protect with barriers or traps until foliage matures.
Why is my king of hearts brunnera slow establishment?
Plants sulk if planted in dry or sunny sites; give them a moist, shaded position and they bulk up steadily.