Pieris japonica is an acid-loving broadleaf evergreen that performs best in USDA zones 6 to 8, in full to part sun with shelter from harsh afternoon heat and drying winter wind. Like its azalea and rhododendron relatives, it wants moist, acidic, well-drained soil rich in organic matter.
Planting
- Choose a spot with full to part sun and protection from intense afternoon sun and winter wind; morning sun with afternoon shade is ideal.
- Work compost or peat into acidic, well-draining soil. Pieris will not tolerate soggy, poorly drained ground or alkaline conditions.
- Dig the planting hole as deep as the root ball and about twice as wide to loosen the surrounding soil.
- Set the plant so the top of the root ball sits level with the surrounding soil; never bury the crown.
- Backfill, firm gently, and water in thoroughly to settle the soil. Finish with 2 to 3 inches of mulch, keeping it pulled back a few inches from the stems.
Care & maintenance
- Water. Keep the soil consistently moist, especially the first two years and during dry spells. The shallow roots dislike both drought and standing water.
- Feed. Apply an acid-forming (holly-tone type) fertilizer formulated for azaleas and rhododendrons in early spring. Avoid over-feeding, which pushes weak growth.
- Light. Best foliage color and flowering come from full to part sun; in hot climates favor afternoon shade.
- Prune. Pieris sets next year's flower buds in summer, so prune only right after flowering in spring. Remove spent flower clusters and any dead or crossing branches; pruning later in the season removes the coming year's blooms.
- Mulch & winter care. Maintain an organic mulch layer to keep roots cool, moist, and acidic. In colder zones, shelter from drying winter wind helps the evergreen leaves come through clean.
- Pests & disease. Watch for lace bugs (stippled, bleached-looking leaves) in too-sunny, dry spots, and for root rot in poorly drained soil. Good drainage and adequate moisture prevent most problems.