Encore Autumn Royalty azalea

Sun

Full sun to partial shade; aim for 4-6 hours of direct light, preferably morning sun with afternoon shade in hot climates.

Water

Keep the shallow root zone evenly moist but not saturated. Water deeply during dry spells, especially during establishment and in containers.

Soil

Acidic, humus-rich, well-drained soil, ideally pH 4.5-6.0. Avoid chalky soil and sites that remain waterlogged.

Height

4-5 ft (1.2-1.5 m)

Spread

4-5 ft (1.2-1.5 m)

Flowers

Large, single, rich purple flowers in spring, with further flushes in summer and autumn; repeat flowering varies with climate and growing conditions.

Foliage

Evergreen. Small, leathery, dark green leaves retained through winter; some older leaves may shed or bronze in cold weather.

Growth

Moderate

Care needed

Medium

• Pollinators
• Heat tolerant
• 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

   2.2 ft (0.67 m)

3. After 2 years

   2.8 ft (0.84 m)

4. After 3 years

   3 ft (1 m)

5. After 5 years

   4 ft (1.4 m)

   full size

About 5 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

Moderate

• Plant with the top of the root ball level with, or slightly above, the surrounding soil.
• Water at soil level when the surface begins to dry; do not let newly planted roots dry out.
• Apply 2-3 in (5-8 cm) of pine bark or leaf-mould mulch, keeping it clear of the stems.
• Feed lightly with an azalea fertiliser after the main spring flowering; avoid late-season nitrogen.
• In alkaline gardens, grow it in a container of ericaceous compost and use rainwater where practical.

Pruning. Prune lightly just after the main spring flowering, shortening stray shoots rather than shearing the whole shrub. Avoid routine late-summer or autumn pruning, which removes developing flower buds; remove dead wood whenever noticed.

Early spring

Check soil moisture and winter damage; remove dead branches once damaged growth is clear.

Spring

Plant in prepared acidic soil, water thoroughly and mulch the root zone.

Late spring

After the main flowering, feed lightly and prune only if shaping is needed.

Summer

Water during dry spells and inspect leaf undersides if foliage becomes pale or stippled.

Autumn

Maintain moisture during repeat flowering and replenish mulch without burying the stems.

Winter

Shelter container plants from drying winds and protect their roots from prolonged freezing.

• Plant in groups beneath high-canopied trees for purple flowers above a leafy woodland understory.
• Use as an informal flowering hedge along a path, allowing room for its natural rounded shape.
• Combine with ferns and hostas in an acidic, partly shaded border for contrasting leaf textures.
• Grow in a large container of ericaceous compost beside a patio where garden soil is alkaline.

Garden styles it suits: Woodland, Traditional, Southern, Cottage garden, Japanese and Romantic rose garden.

Plant it with: Japanese pieris, Camellias, Japanese maples, Hostas, Christmas fern and Japanese forest grass.

Wildlife: Flowers provide nectar and pollen for visiting insects, including bees. Dense evergreen growth offers small birds shelter, but deer may browse the foliage and buds.

• Azalea lace bugs cause pale stippling, especially in hot, exposed sites. Check leaf undersides and treat infested surfaces with an insecticidal soap labelled for azaleas, following local directions.
• Phytophthora root rot causes wilting and root decay in wet ground. Improve drainage before planting and remove badly affected plants; extra watering makes the problem worse.
• Yellow leaves with green veins often indicate iron deficiency in alkaline soil. Check soil pH and move to suitable acidic soil or ericaceous compost; chelated iron may provide temporary relief.
• Weak repeat flowering can result from deep shade, drought or late pruning. Provide more morning sun, maintain steady moisture and prune only after the main spring flush.

All parts are toxic to people, cats, dogs and horses if eaten, including leaves, flowers and nectar. Grayanotoxins can cause vomiting, weakness, abnormal heart rhythms and potentially life-threatening poisoning; seek urgent medical or veterinary advice after ingestion.

• Formosa azalea (Rhododendron 'Formosa')

  Also has large purple flowers, but generally becomes a much larger shrub and flowers mainly in spring rather than producing dependable repeat flushes.

• Encore Autumn Twist azalea (Rhododendron 'Conlep')

  Usually bears pale flowers striped or splashed with purple, sometimes alongside solid purple flowers; Autumn Royalty normally has uniformly purple flowers.

Rhododendron comes from the Greek words for 'rose' and 'tree'; Autumn Royalty is the selling name for the cultivar 'Conlec'.

Propagation. Root semi-ripe cuttings in summer in a moist, free-draining acidic medium with high humidity. Seedlings will not reliably retain the cultivar's characteristics; check any local plant-propagation rights before multiplying it.

Accepted botanical name

Rhododendron

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