Pieris Brown Leaves: Winter Burn plus Lace Bug Damage
Pieris brown leaves usually show up in spring. This evergreen shrub loses water through its leaves on sunny winter days, while frozen roots cannot replace it.
The short answer
University of Wisconsin Extension notes winter burn browns broad leaved evergreens, starting at leaf edges. Foliage facing south or west is most often hit. Mulch the root zone plus skip late season pruning. NC State Extension notes pieris likes shelter from winter winds.
What is winter burn on pieris?
Wisconsin notes that on sunny winter days leaves lose water. The ground is frozen, so roots cannot replace it. Leaves dry plus brown. Wind adds to it. New transplants with small roots are prone.
| Sign | Likely cause | Source |
|---|---|---|
| Brown leaf edges in spring | Winter burn | Wisconsin |
| South or west side brown | Winter sun | Wisconsin |
| White stippled leaves | Lace bugs | Maryland |
| Black dots under leaves | Lace bug waste | Maryland |
Source: UW Extension plus University of Maryland Extension.
Could lace bugs cause brown pieris leaves?
University of Maryland Extension notes the andromeda lace bug is a common pieris pest. Feeding leaves white stippling. Spots merge plus leaves turn yellow. Black specks sit on the leaf undersides.
How do I cut winter browning next year?
Wisconsin advises 2 to 4 inches of loose mulch out to the drip line. Plant early in spring or late summer. Avoid pruning in late summer or early fall.
How to: step by step
- Check which side of the shrub browned.
- Flip a few leaves to look underneath.
- Wait for new growth before pruning.
- Plant new shrubs by early fall.
- Mulch out to the drip line.
- Shelter the shrub from winter wind.
Troubleshooting
Brown edges on the sunny side: winter burn. Spread mulch to the drip line.
Pale, speckled leaves: lace bugs. Check leaf undersides.
Whole shrub brown: root stress. NC State notes root rot can occur.
For plant stress see environmental stresses on plants plus frost damage. Read underwatering. Kind Seed Co also stocks cannabis seeds.
Sources
- Winter burn, University of Wisconsin Extension Horticulture
- Lace bugs on trees and shrubs, University of Maryland Extension
- Pieris japonica (Japanese pieris), NC State Extension Gardener Plant Toolbox
- Environmental disorders of woody plants, Colorado State University Extension
FAQ
Will pieris grow new leaves after winter burn?
Wisconsin notes browned foliage often drops from spring through midsummer as new foliage is produced.
When should pieris be pruned?
NC State Extension notes next season's blossoms appear on old growth. Wisconsin advises no pruning of evergreens in late summer or early fall.
Does pieris need shade?
NC State notes pieris grows in full sun to part shade plus prefers some shade in southern gardens.
How do I stop pieris browning next winter?
Wisconsin advises 2 to 4 inches of mulch out to the drip line. A site sheltered from wind helps.
What soil does pieris like?
NC State notes pieris needs moist, well drained acidic soil enriched with organic matter.
