Pieris
Pieris japonica
A compact evergreen shrub prized for its brilliant red or bronze new growth in spring, which gradually matures to deep green. Drooping clusters of white or pink bell-shaped flowers appear from March to May. Requires acid soil and a sheltered position. One of the finest spring-interest shrubs for UK gardens, providing colour from foliage and flowers simultaneously.
How to grow pieris
Plant in autumn or spring in acid soil enriched with ericaceous compost. Choose a sheltered, partially shaded position away from cold east winds. The vivid red new growth is vulnerable to late frosts — cover with fleece on frosty nights in April and May. Water with rainwater in hard water areas. Keep the soil consistently moist but never waterlogged. Mulch thickly each spring with composted bark or pine needles to maintain acidity and moisture. Feed in spring with an ericaceous slow-release fertiliser. Pieris grows well in large containers of peat-free ericaceous compost where garden soil is alkaline. The cultivar 'Forest Flame' is the most popular for its spectacular red young leaves.
Pruning
Prune lightly after flowering in late spring, removing faded flower heads and any dead or damaged branches. Pieris rarely needs heavy pruning. If the plant becomes too large, it can be cut back hard in late spring and will regrow, though slowly. Avoid autumn or winter pruning which may encourage tender new growth vulnerable to frost.
Propagation
- Semi-ripe cuttings in late summer
- Layering in autumn
Common problems
- Frost damage to new red growth
- Lacebug causing mottled yellow leaves
- Yellowing leaves on alkaline soil
- Root rot in waterlogged conditions