The four main lamb's ear plant problems you'll run into are leaf rot, powdery mildew, crown meltout, and root rot. All four trace back to one cause: too much moisture. Keep your plants dry and well-spaced and you can avoid most of these issues in your garden.
I found out the hard way during a humid July when I noticed mushy brown leaves in the center of my biggest clump. The outside looked fine but the middle was a soggy mess. I pulled apart the clump, cut out all the rotten parts, and replanted the healthy pieces with more space between them. That fix saved the plant. Most lamb's ear diseases start in the center of crowded clumps where air can't reach the leaves. If you catch it early, you can rescue your plants the same way I did.
Humidity is the main enemy of your lamb's ear. Those fuzzy trichomes on each leaf do a great job keeping water in during dry spells. But in humid weather, they work against the plant. The woolly hairs trap moisture against the leaf surface and create a perfect spot for fungus to grow. Lamb's ear diseases thrive in these damp pockets where air flow is poor. Your plants need good spacing and a spot with breeze to stay healthy through wet summers.
NC State Extension flags lamb's ear as prone to leaf rot in high humidity zones. They also note a risk of Southern Bacterial Wilt in warm wet climates. UW Extension warns about crown meltout where the center of an old clump dies and rots away. Winter injury adds another concern if your soil holds too much water during the cold months. All of these lamb's ear plant problems share the same root cause, and your best defense is fast-draining soil.
Mushy Brown Leaves
- Cause: Too much water sitting on your leaves and crown, often from overhead watering or humid air trapping moisture.
- What it looks like: Soft slimy leaves that fall apart when you touch them, usually starting in the center of your clump first.
- Your fix: Stop watering from above and pull out all rotten leaves. Divide your clump to improve air flow around each plant.
White Powder on Leaves
- Cause: Powdery mildew from poor air flow around your plants, especially in shady or crowded spots in your garden.
- What it looks like: A dusty white coating on your leaf surfaces that spreads fast to nearby leaves during warm humid weather.
- Your fix: Thin out your clump, move it to a sunnier spot, and spray with a baking soda solution to slow the spread.
Dead Center of Clump
- Cause: Crown meltout from an old clump that has grown too thick for air to reach the middle section of the plant.
- What it looks like: The outer ring grows fine but the center turns brown and dies, leaving a donut shape in your lamb's ear patch.
- Your fix: Dig up the whole clump and divide it into smaller pieces. Replant healthy sections 8 to 10 inches (20 to 25 cm) apart.
Wilting in Wet Soil
- Cause: Root rot from soil that stays soggy too long after rain or watering, drowning your plant's root system.
- What it looks like: Your whole plant wilts and droops even though the soil is wet, which confuses many gardeners who think it needs more water.
- Your fix: Move your plant to a raised bed or add coarse sand to the soil. Lamb's ear leaf rot starts at the roots and works up.
The best way to prevent lamb's ear leaf rot and all these other problems is to check your plants once a week during humid months. Pull out any brown or mushy leaves right away before the rot spreads. Divide your clumps every 2 to 3 years so they don't get too thick. Your lamb's ear will stay clean and healthy if you keep moisture away from its center.
Don't let this list of problems scare you off from growing lamb's ear. These issues only pop up when conditions get too wet. Give your plants sun, good drainage, and some room to breathe and you'll see very few problems at all. Most of the time this plant takes care of itself with zero fuss from you.
Read the full article: Lamb's Ear Plant Care and Growing Guide
