Mountain Fire pieris

Sun

Partial shade, ideally morning sun and afternoon shade. Tolerates more sun in cool climates if the soil stays moist; protect from drying winds.

Water

Keep the root zone evenly moist but never saturated. Water deeply during dry spells, especially during the first two growing seasons and when grown in containers.

Soil

Acidic, humus-rich, well-drained soil, ideally pH 4.5-6.0. Use an ericaceous potting mix in containers where garden soil is alkaline.

Height

6-10 ft (1.8-3 m)

Spread

4-6 ft (1.2-1.8 m)

Flowers

Late winter to mid-spring, depending on climate; drooping clusters of small, white, urn-shaped flowers.

Foliage

Evergreen. Glossy, narrow oval leaves emerge bright red, pass through bronze tones and mature to dark green. Flower buds remain visible through winter.

Growth

Slow; may take 10-20 years to approach its full size.

Care needed

Medium

• Pollinators
• Deer resistant
• Wildlife
• Low allergen

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.4 ft (0.74 m)

3. After 2 years

   3 ft (0.98 m)

4. After 3 years

   4 ft (1.2 m)

5. After 5 years

   6 ft (1.7 m)

About 8 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Slow

• Plant with the top of the root ball level with the surrounding soil; do not bury the crown.
• Water deeply when the surface soil begins to dry, using rainwater where tap water is alkaline.
• Apply 2-3 in (5-8 cm) of leaf mould or composted bark over the roots, keeping it clear of the stems.
• Feed lightly in spring with an ericaceous fertiliser if growth is weak; avoid heavy feeding.
• Avoid digging around the shallow roots, and shelter young plants from drying wind and late frost.

Pruning. Prune just after flowering, removing dead or damaged stems and shortening only branches that spoil the shape. Avoid late-season pruning, which removes the following spring's flower buds.

Late winter

Check soil moisture in containers and protect developing flower buds from severe frost and drying wind.

Spring

Plant once the soil is workable, water thoroughly and mulch the root zone.

Mid-spring

After flowering, remove spent flower clusters if desired and carry out light shaping.

Late spring

Check tender red shoots for frost damage and inspect leaf undersides for lace bugs.

Summer

Water during dry spells and take semi-ripe cuttings if you want more plants.

Autumn

Refresh mulch and check drainage before wetter weather; avoid pruning off developing flower buds.

• Use as an evergreen anchor beneath high-canopied trees, where its red shoots stand out against green foliage.
• Combine with rhododendrons, camellias and ferns in a sheltered acidic-soil border.
• Place near a path or entrance where the hanging flowers and colourful new growth can be seen closely.
• Grow in a large, well-drained container of ericaceous compost in a sheltered courtyard.

Garden styles it suits: Woodland, Japanese, Traditional, Modern courtyard, Pacific Northwest woodland and Winter interest.

Plant it with: Rhododendrons, Japanese camellias, Japanese maples, Japanese painted ferns, Hostas and Skimmias.

Wildlife: Flowers provide nectar and pollen for bees, including early-season bumblebees. Dense evergreen branches offer shelter for small garden animals.

• Pieris lace bug causes pale stippling on leaves and dark specks underneath. Inspect leaf undersides, reduce drought stress and treat young insects with an insecticidal soap labelled for the plant and pest where permitted.
• Phytophthora root rot causes wilting and dieback in wet soil. Improve drainage, avoid overwatering and remove badly affected plants; do not replace them in the same poorly drained spot.
• Yellow leaves with green veins often indicate iron chlorosis from alkaline soil or water. Check soil pH, use rainwater and grow in ericaceous compost if the garden soil is unsuitable.
• Late frost, strong sun and drying wind can scorch new shoots or flower buds. Choose a sheltered, partly shaded site and cover tender growth temporarily when frost is forecast.

Toxic to people, cats, dogs and horses if eaten. All parts contain grayanotoxins, including the leaves and flowers; ingestion can cause vomiting, weakness, abnormal heart rhythms and potentially fatal poisoning. Keep clippings away from livestock and seek urgent medical or veterinary advice after suspected ingestion.

• Red robin photinia (Photinia × fraseri 'Red Robin')

  Also produces red new growth, but usually has larger, more obviously toothed leaves and broad heads of small white flowers rather than hanging urn-shaped flowers.

• Drooping leucothoe (Leucothoe fontanesiana)

  Has arching stems and hanging white urn-shaped flowers, but its flower clusters arise along the stems rather than forming the large branched terminal clusters typical of pieris.

• Bog rosemary (Andromeda polifolia)

  Shares the name andromeda and has urn-shaped flowers, but is a much smaller bog shrub with narrow, rolled-edged leaves that are pale underneath.

The epithet japonica means 'from Japan', while 'Mountain Fire' refers to the cultivar's fiery red new growth.

Propagation. Take semi-ripe cuttings in mid- to late summer and root them in a free-draining acidic medium with gentle humidity. Layering low branches is another option; seedlings will not reliably retain the cultivar's characteristics.

Accepted botanical name

Pieris japonica

Native range

China South-Central, China Southeast, Japan and Taiwan.

Measured

Soil pH 4.2 to 5.5. Average height 332 cm.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.