Shrub · Ericaceae
Encore Azalea
Rhododendron
Settle one into acidic soil, filtered sun, and steady moisture, and your Encore azalea rewards you with spring color that returns into fall.
Partial sun
Every 3–7 days
USDA 6–10
2–5 ft · 0.6–1.5 m
Overview
If you have wanted an azalea that does not quit after one quick spring show, the Encore is a kind place to start. It is a reblooming shrub that flowers in spring like any azalea, then circles back with more bloom from summer into fall. It sits in the genus Rhododendron within the heath family, raised as a series of hybrids for gardeners who simply wanted more color, and a settled plant rounds out into a gentle mound of evergreen leaves dotted with flowers.
The happy surprise here is sun. Old garden azaleas pout in anything brighter than dappled shade, but Encores welcome more direct sun and turn it into that second and third round of flowers. Give them too little light and the reblooming fades, so do not tuck yours into a dark corner and worry. A brighter spot is the easier path.
These shrubs ask for acidic, well-drained soil full of organic matter and even moisture at the roots, and they give back a lot for very little fuss. Pruning stays light, deadheading is something you can skip, and a well-placed plant happily settles in for years. The one rule to take to heart is toxicity, since every part of the shrub can harm pets, livestock, and people, so a careful spot keeps everyone safe.
Care
The short version: tuck it into acidic, well-drained soil with filtered sun and a bit of afternoon shade, keep the roots evenly moist without ever letting them sit in water, offer an acid-forming azalea fertilizer in late spring, and trim lightly right after the spring flowers fade.
Light
Encore azaleas are happiest in filtered or partial sun, and unlike the old garden kinds they will take some full sun without complaint. Look for a spot with bright light and a little afternoon shade. Too much shade quietly costs you the reblooming, while harsh, hot sun wears the plant down and tempts lace bugs.
Water
Aim to keep the soil evenly moist but well-drained, soaking deeply down to 6 to 8 inches once the top few inches feel dry to your fingers. A young plant in sandy soil may want a drink about twice a week through its first year, which is normal. Steady moisture is the goal, so just remember that standing water turns roots to mush in a hurry.
Soil
These shrubs really do best in acidic soil, ideally a pH of 4.5 to 6.0, that drains well and holds plenty of organic matter. Mix in pine bark or compost before you plant and set the shrub a touch high in the hole. Heavy, soggy ground is the fastest way to lose one, so give the roots room to breathe.
Temperature
Encore azaleas are tougher than they look, hardy across a wide band from about -9°F to 100°F (-23°C to 38°C), which lines up with zones 6 through 10. They shrug off real winter cold and summer heat alike. In the coldest zones, young plants simply appreciate a little shelter from drying wind.
Humidity
Everyday outdoor humidity suits them fine, so there is no target number to chase here. 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 a bit of breathing room and you head off both.
Feeding
Offer a complete, slow-release acid-forming azalea fertilizer, around a 2-1-1 ratio, in late spring once new growth shows and on through early summer. Skip any late-fall feeding, since it pushes out tender growth right as the cold arrives. One seasonal helping is usually all a healthy plant needs.
Pruning
Happily, these shrubs need very little pruning. If you would like to shape or thin one, do it just after the spring flush so you do not snip off the rebloom that is on its way. You can skip deadheading altogether, because the plant reblooms on its own.
Repotting
Encore azaleas are rarely repotted and feel most at home planted out in the ground. If you are growing one in a container, keep a friendly eye out for roots circling the soil ball or growth that stalls, both gentle signs it has outgrown its pot and would love a larger one with fresh acidic mix.
Size & spacing
A mature plant settles in at 2 to 5 feet (61 to 152 cm) tall and spreads a bit wider than it is high, around 3 to 4 feet (91 to 122 cm) across. Give each shrub the room to reach its full width so air can move through and the leaves stay dry, which keeps trouble away.
When to plant
Encore azaleas are woody shrubs that come through winter in zones 6 through 10, and you set them out as young nursery plants rather than fussing with seed. Spring or fall is the gentle window, while the weather is mild and roots have time to take hold. Spring brings the first wave of flowers, and the reblooming habit carries fresh color 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 of the worry with Encore azaleas comes down to the spot you picked, whether that is too much sun inviting lace bugs or too much water rotting the roots. The good news is that catching the early signs on leaves, flowers, or roots usually lets you turn a struggling plant around. Find the picture that matches yours below, then step in before it spreads.
Wilting and fading, with roots gone dark and soft
If a plant wilts and fades even with moisture in the ground, suspect Phytophthora root and crown rot, a soil disease that thrives in wet, poorly drained spots. Dig at the base and the roots come up dark and mushy rather than firm and pale. A badly rotted plant cannot be saved, so lift it out, fix the drainage, and replant shallow in acidic soil enriched with pine bark.
Fix:
- Improve drainage and avoid overwatering
- Remove severely affected plants
Leaves turning gray and speckled, with dark flecks below
Those pale, washed-out leaves are usually the azalea lace bug at work, feeding on the undersides and pulling the color out from below. Turn a few leaves over and look for the lacy-winged adults, the spiny nymphs, and the dark varnish-like droppings, or wipe an underside on white paper to rule out spider mites. Treat the undersides with a labeled insecticide, or reach for a soil systemic when you want season-long cover, and move plants out of hot full sun where these bugs do their worst.
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
Blossoms spotting, then slumping into a soft mush
When open flowers spot and then slump into mush within days, the cause is petal blight, a fungus that loves cool, wet weather. The marks start small, pale on colored petals or rust-toned on white ones, and spread until the bloom collapses. Pick off the infected flowers and bin them, water at the base instead of overhead, and open the plant up so air moves through it while it is blooming.
Fix:
- Remove and dispose of infected blooms
- Improve air circulation and avoid overhead watering during bloom
Toxicity
This is the one place to be firm with yourself, because an Encore azalea is genuinely dangerous around animals and small children. Every part of the plant holds grayanotoxins, the same compounds found across the rhododendrons, and even a few leaves or flowers can make a pet sick. Keep the shrub, its trimmings, and any fallen leaves and flowers well away from cats, dogs, horses, livestock, and curious little ones, and you have handled the only real hazard.
Toxic to
Cats · Dogs · Horses · Rabbits · Livestock · Birds · People
Cats Severe
Just a couple of leaves can leave a cat very unwell. Early on you may see drooling, vomiting, and diarrhea, then weakness and an unsteady, wobbly walk. In larger doses the grayanotoxins upset the heart rhythm and drop the blood pressure, and a cat can collapse, so please treat any nibble as an emergency.
Dogs Severe
A dog that chews the leaves or flowers will usually drool, vomit, and develop diarrhea within hours. Tremors, weakness, and loss of coordination can follow as the toxin moves through. A big mouthful puts the heart and blood pressure at risk, which is exactly why even a small amount deserves a quick call to the vet.
Horses Severe
Horses cannot vomit, so the grayanotoxins hit hard and linger. Look for 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 well out of their reach.
Rabbits Severe
The same grayanotoxins that poison cats and dogs are dangerous to rabbits. A nibble can bring on a sluggish gut, a lost appetite, weakness, and a slowed heartbeat. Never offer azalea leaves or flowers, and clear any prunings from wherever a rabbit grazes.
Livestock Severe
Goats, sheep, and cattle are poisoned by even small amounts of azalea, and grazing animals sometimes eat enough to die. The usual signs are 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 their small size means a little goes a long way. A bird that pecks the leaves or flowers may grow weak, lose its balance, and develop a disturbed heart rhythm. Keep pet birds away from the foliage entirely.
People Caution
Azalea simply isn't food, and its grayanotoxins can leave a person unwell just as they do a pet. A child or grown-up who eats a few leaves or flowers might feel queasy and weak, with vomiting and, when more goes down, a heartbeat that slows or turns uneven. Keep it well beyond little hands, and if anyone does swallow some, call poison control right away.
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 grown to many named cultivars, grouped mostly by the color of their flowers. These four give you a friendly sense of the range.
Autumn Royalty
Autumn Royalty is a reblooming Encore cultivar that opens rich purple flowers.
Autumn Twist
Autumn Twist is a reblooming Encore type loved for its striped, bicolor blooms.
Autumn Fire
Autumn Fire is a reblooming Encore cultivar that glows with bold red flowers.
Autumn Moonlight
Autumn Moonlight is a reblooming Encore type that opens in clean, soft 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
You can grow more Encore azaleas from the ones already in your garden, either by rooting cuttings or by gently layering a low branch, and a little patience is all it really takes.
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 tuck them into a moist, well-drained acidic medium. They root slowly, often over several weeks to a few months, so keep them humid and stay patient until fresh growth tells you they have taken hold.
LayeringEasy
Spring · One or more growing seasons
Layering is the gentle, beginner-friendly route. In spring, pin a low, flexible branch down into acidic soil and leave it joined to the parent while it roots, which can take a full growing season or more. Once it has roots of its own, cut it free and move it to its new home.
Myths
A little taste of azalea won't really hurt a pet, since the plant is barely poisonous.
Every part of the plant carries grayanotoxins, and the amount in just a few leaves is enough to cause real harm. A small taste can set off vomiting, weakness, and a dangerous heart rhythm in a cat or dog, and a larger one can be fatal. Treat any azalea as seriously as that sounds, and keep pets away from the whole plant.
Like the old varieties, Encore azaleas have to have full shade.
These were bred to handle more sun than traditional azaleas. To rebloom well they want at least 4 to 6 hours of sun, ideally with a bit of afternoon shade, so a deeply shaded spot leaves you short on the very repeat flowers you planted them for.