Shrub · Ericaceae
Encore Azalea
Rhododendron
Give it acidic soil, filtered sun, and steady moisture, and the Encore azalea blooms in spring and comes back into fall.
Partial sun
Every 3–7 days
USDA 6–10
2–5 ft · 0.6–1.5 m
Overview
Want an azalea that doesn't pack up after one spring? That's the whole idea behind the Encore. It's a reblooming shrub that flowers in spring like any azalea and then shows up again from summer into fall. It belongs to the genus Rhododendron in the heath family, bred as a series of hybrids for folks who wanted more than the usual quick show, and a grown plant rounds out into a tidy mound of evergreen leaves full of flowers.
So what makes these different from the old garden azaleas? Sun, mostly. The traditional kinds sulk in anything brighter than dappled shade, but Encores are fine with more direct sun, and they put that light to work on the second and third round of flowers. Give them too little, though, and you'll lose the reblooming that's the whole point.
They want acidic, well-drained soil with lots of organic matter and steady moisture down at the roots, and honestly they don't ask for much beyond that. Pruning's light, you can skip deadheading, and a plant in the right spot just settles in for years. The one thing to take seriously is toxicity, since every part of the shrub can poison pets, livestock, and people.
Care
The short version: pop it into acidic, well-drained soil with filtered sun and a bit of afternoon shade, keep the roots evenly moist but never waterlogged, feed it an acid-forming azalea fertilizer in late spring, and give it a light trim right after the spring bloom.
Light
Encore azaleas like filtered or partial sun, and unlike the old garden types they're okay with some full sun too. Shoot for bright light with a little afternoon shade. Too much shade and you'll lose the reblooming, but harsh, hot sun stresses the plant and brings in lace bugs, so there's a happy middle.
Water
Keep the soil evenly moist but well-drained, and water deeply, down to 6 to 8 inches, once the top few inches feel dry. A new plant in sandy soil might want a drink about twice a week through its first year. Steady moisture is great, but standing water? That'll rot the roots fast.
Soil
These shrubs need acidic soil, ideally a pH of 4.5 to 6.0, that drains well and holds plenty of organic matter. Mix in some pine bark or compost before planting and set the plant a touch high. Heavy, soggy ground is the fastest way to lose one, so don't skip the drainage.
Temperature
Encore azaleas are hardy across a big range, from about -9°F to 100°F (-23°C to 38°C), which covers zones 6 through 10. They handle serious winter cold and summer heat just fine. In the coldest zones, though, young plants like a little shelter from drying wind.
Humidity
Regular outdoor humidity is plenty, so there's no number to fuss over. What matters more is good air circulation, because crowded, still, damp conditions are exactly what bring on petal blight and lace bug trouble. Give each plant some breathing room and you're set.
Feeding
Feed with a complete, slow-release acid-forming azalea fertilizer, around a 2-1-1 ratio, in late spring once new growth shows up, and on through early summer. Skip feeding in late fall, since that pushes out tender growth right before the cold. One feeding a season usually does it.
Pruning
Good news here: these shrubs need very little pruning. If you do want to shape or thin one, do it right after the spring flush so you don't snip off the rebloom that's coming. And you can skip deadheading, since the plant reblooms on its own anyway.
Repotting
Encore azaleas hardly ever need repotting and are happiest planted out in the ground. If yours is in a container, keep an eye out for roots circling the soil ball or growth that just stalls, both signs it's outgrown its pot and wants a bigger one with fresh acidic mix.
Size & spacing
A grown plant lands around 2 to 5 feet (61 to 152 cm) tall and spreads wider than it is high, roughly 3 to 4 feet (91 to 122 cm) across. Give each shrub room for that full width so air moves through and the leaves stay dry, which keeps a lot of trouble away.
When to plant
Encore azaleas are woody shrubs that handle zones 6 through 10, and you'll plant them as nursery shrubs rather than starting from seed. The easy windows are spring and fall, when it's mild out and the roots get time to settle in. Spring brings the first flowers, and then that reblooming habit keeps the color coming from summer through fall.
Northern hemisphere
Southern hemisphere
Typical months for a temperate climate: start earlier in warm zones, later where spring frosts linger.
- Plant: Spring or fall
- Harvest: Spring, then again summer through fall
Hardiness
USDA hardiness zones: 6–10
Temperature: down to -23°C
Troubleshooting
Most trouble with Encore azaleas comes back to where they're planted. Too much sun? That's an invitation for lace bugs. Too much water? That's how the roots rot. Catch the signs early on the leaves, flowers, or roots and you can usually bring a plant back. Find what matches below, then jump on it before it spreads.
Droopy, dying growth and dark, mushy roots
If a plant's wilting and going downhill even though there's water in the ground, think Phytophthora root and crown rot, a soil disease that loves wet, poorly drained spots. Dig down at the base and you'll find roots that are dark and mushy instead of firm and pale. There's no saving a badly rotted plant, so pull it, sort out the drainage, and replant shallow in acidic soil mixed with pine bark.
Fix:
- Improve drainage and avoid overwatering
- Remove severely affected plants
Whitish, speckled leaves and dark dots on the underside
That washed-out, speckled look is usually the azalea lace bug, which feeds on the leaf undersides and pulls the color out from above. Flip a few leaves and you'll spot the lacy-winged adults, the spiny nymphs, and the varnish-like droppings, or wipe an underside on white paper to rule out spider mites. Hit the undersides with a labeled insecticide, or go with a soil systemic if you want season-long cover, and get the plant out of hot full sun where these bugs really pile on.
Fix:
- Treat undersides of leaves with a labeled insecticide such as acephate, bifenthrin, malathion, or cyfluthrin
- For season-long control use a soil-applied systemic such as imidacloprid or dinotefuran
- Plant lace-bug-resistant cultivars where possible
Spotted flowers that turn to slimy goo
When the open flowers spot up and then slump into mush in just a few days, that's petal blight, a fungus that loves cool, wet weather. The spots start small, pale on colored petals or rust-toned on white ones, and keep spreading until the bloom caves in. Pick off the infected flowers and toss them, water at the base instead of overhead, and open the plant up so air can move through while it's blooming.
Fix:
- Remove and dispose of infected blooms
- Improve air circulation and avoid overhead watering during bloom
Toxicity
Here's the part to really pay attention to, because this plant is genuinely dangerous around animals and little kids. Every part of an Encore azalea has grayanotoxins in it, the same stuff that's in all the rhododendrons, and even a few leaves or flowers can make a pet sick. Keep the shrub, its prunings, and any fallen leaves and flowers well away from cats, dogs, horses, livestock, and curious kids.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Severe
Even a couple of leaves can make a cat really sick. Early on you'll see drooling, vomiting, and diarrhea, and then weakness and an unsteady, wobbly walk. In bigger doses the grayanotoxins mess with the heart rhythm and drop the blood pressure, and a cat can collapse, so any nibble is an emergency.
Dogs Severe
A dog that chews the leaves or flowers usually drools, vomits, and gets diarrhea within hours. Tremors, weakness, and loss of coordination can come next as the toxin spreads. A big mouthful puts the heart and blood pressure at risk, which is why even a little bit means a fast call to the vet.
Horses Severe
Horses can't vomit, so the grayanotoxins hit hard and stick around. Expect colic, diarrhea, drooling, and deep weakness, and in serious cases the heart starts to fail. Browsing horses are at real risk, so keep clippings and fallen leaves way out of reach.
Rabbits Severe
The same grayanotoxins that poison cats and dogs are dangerous to rabbits too. A nibble can bring on a sluggish gut, no appetite, weakness, and a slowed heartbeat. Never offer azalea leaves or flowers, and clear any prunings from where a rabbit grazes.
Livestock Severe
Goats, sheep, and cattle get poisoned by even small amounts of azalea, and grazing animals sometimes eat enough to die. You'll see drooling, repeated vomiting or regurgitation, staggering, and a faltering heartbeat. Fence the shrubs off and never toss trimmings into a pasture.
Birds Severe
Birds are sensitive to the grayanotoxins in every part of this plant, and since they're small, a little goes a long way. A bird that pecks the leaves or flowers might get weak, lose its balance, and end up with a disturbed heart rhythm. Keep pet birds away from the foliage entirely.
People Caution
No part of an azalea is meant to be eaten, and the grayanotoxins can sicken a person too. A child or adult who swallows leaves or flowers might feel nauseated and weak, with vomiting and, in bigger amounts, a slowed or irregular heartbeat. Keep the plant out of reach of small kids and call poison control if anyone eats it.
Keep plants, prunings, and fallen leaves and flowers away from pets and livestock; even a few leaves or flowers can cause serious signs.
Helpline numbers
United States
ASPCA Animal Poison Control: (888) 426-4435 (fee applies)
Poison Control: (800) 222-1222
Canada
Poison Centres: 1-844-764-7669
Varieties
The Encore series has loads of named cultivars, and they're mostly sorted by flower color. These four give you a good feel for the range.
Autumn Royalty
Autumn Royalty is a reblooming Encore cultivar with rich purple flowers.
Autumn Twist
Autumn Twist is a reblooming Encore type that's known for striped, bicolor blooms.
Autumn Fire
Autumn Fire is a reblooming Encore cultivar that brings bold red flowers.
Autumn Moonlight
Autumn Moonlight is a reblooming Encore type that blooms in clean white.
Companions
Encore azaleas do best under high, open trees that filter the light and drop an acidic mulch as their leaves break down.
Plant near
Oak: Provides high filtered shade while allowing enough light, and its leaf mulch breaks down to acidify and feed the soil
Pine: Gives filtered shade and acidic needle mulch suited to azaleas' soil needs
How to propagate
Want more Encore azaleas without buying them? You can grow them from plants you've already got, either by rooting cuttings or layering a low branch, though both take a little patience.
Stem cuttingsModerate
Late spring to summer from semi-hardwood growth · Several weeks to months to root
Take cuttings of current-season, semi-hardwood growth from late spring into summer and set them into a moist, well-drained acidic medium. They're slow to root, often several weeks to a few months, so keep them humid and just be patient until new growth tells you they've caught.
LayeringEasy
Spring · One or more growing seasons
Layering's the easy way in. In spring, pin a low, flexible branch down into acidic soil and leave it attached to the parent while it roots, which can take a full growing season or more. Once it's got its own roots, snip it free and move it where you want it.
Myths
Azaleas are hardly toxic at all, so a quick nibble won't bother a pet.
Every part of the plant's got grayanotoxins in it, and the dose in just a few leaves is enough to do real harm. A small nibble can set off vomiting, weakness, and a dangerous heart rhythm in a cat or dog, and a bigger one can kill. Treat any azalea this seriously, and keep pets away from the whole plant.
Encore azaleas want full shade, same as the old-school types.
Nope, these were bred to take more sun than the traditional azaleas. To rebloom well they want at least 4 to 6 hours of sun, ideally with some afternoon shade, so a deep-shade spot leaves you short on the repeat flowers they're grown for.