True summer-long blooming azaleas represent one of the most exciting and relatively recent developments in ornamental shrub breeding. Traditional azaleas are celebrated for their spectacular but brief spring flower displays, typically lasting only two to four weeks before the blooms fade entirely until the following year.
The introduction of reblooming azalea technology — pioneered most notably by the Encore Azalea series in the 1990s — transformed the azalea world by producing varieties capable of flowering in spring, resting briefly, and then reblooming continuously through summer and autumn until the first hard frosts. These remarkable shrubs deliver months of color rather than weeks, fundamentally changing what gardeners can expect from this beloved genus.
Azaleas that Blooms All Summer
Encore Azalea ‘Autumn Empress’ (Rhododendron ‘Robleg’)
One of the most spectacular and widely planted of all reblooming azaleas, Autumn Empress produces enormous, fully double, deep rose-pink flowers with ruffled, layered petals that bloom prolifically in spring and then rebloom continuously through summer and into autumn.
Its large flower size — significantly bigger than most azalea blooms — and its rich, warm pink color make it one of the most visually striking reblooming shrubs available. It forms a rounded, dense, evergreen shrub reaching 3–4 feet and performs best in partial shade with consistent moisture and well-drained, acidic soil.
Encore Azalea ‘Autumn Fire’ (Rhododendron ‘Roblez’)
A brilliantly vivid reblooming azalea producing an abundance of single, vivid scarlet-red flowers with distinctive darker red veining and frilled petal margins in spring and repeatedly through summer and autumn.
The intense, pure scarlet color of Autumn Fire is among the most striking and eye-catching of any reblooming azalea and provides outstanding hot-colored contrast in the summer garden when most azaleas have long since finished flowering. It forms a compact, rounded, evergreen shrub reaching 3–4 feet with dense, dark green foliage that sets off the vivid red flowers magnificently.
Encore Azalea ‘Autumn Coral’ (Rhododendron ‘Roblen’)
A beautiful reblooming azalea producing single to semi-double flowers in a warm, glowing coral-pink — a color that sits between the deep pinks and vivid oranges of other Encore varieties and provides outstanding versatility in mixed planting combinations.
Autumn Coral blooms in spring and then reblooms reliably through summer and into autumn, maintaining a continuous presence of warm-colored flower clusters throughout the growing season. It forms a compact, well-branched, evergreen shrub reaching approximately 3 feet with attractive, glossy, dark green foliage that remains ornamental year-round.
Encore Azalea ‘Autumn Twist’ (Rhododendron ‘Roblez2’)
One of the most uniquely colored and visually fascinating of all reblooming azaleas, Autumn Twist produces bicolored flowers with white petals dramatically striped and splashed with vivid orchid-purple — a color combination unlike any other commonly available azalea.
The striping pattern varies from flower to flower, with some blooms showing bold, broad purple stripes and others showing more subtle, irregular markings, creating a lively, unpredictable floral display. It blooms in spring and reblooms reliably through summer and autumn, forming a compact, rounded, evergreen shrub reaching 3–4 feet.
Encore Azalea ‘Autumn Princess’ (Rhododendron ‘Robleg2’)
A refined and elegant reblooming azalea producing large, single to semi-double flowers in soft, pale orchid-lavender pink — one of the most delicate and sophisticated color tones in the Encore collection.
Autumn Princess blooms abundantly in spring and then reblooms continuously through summer and into autumn, providing months of soft, refined color that combines beautifully with blue, purple, and white companion plants. It forms a compact, dense, rounded evergreen shrub with attractive dark green foliage and reaches 3–4 feet in height and spread, making it ideal for foundation plantings and border specimens.
Encore Azalea ‘Autumn Rouge’ (Rhododendron ‘Roblen2’)
A richly colored reblooming azalea producing deep, saturated, rose-red to magenta flowers with a warm, jewel-like intensity that provides bold, vivid color from spring through summer and into autumn.
The deep, saturated color of Autumn Rouge intensifies beautifully in partial shade, where the rich magenta-red flowers glow with particular luminosity against the dark green evergreen foliage. It forms a compact, well-branched shrub reaching 3–4 feet and is highly valued for its deep, sophisticated color tone that bridges the gap between the cooler pinks and warmer reds in the reblooming azalea palette.
Bloom-A-Thon Lavender (Rhododendron Bloom-A-Thon series)
Part of the Bloom-A-Thon reblooming azalea series developed as a competitor to the Encore range, Bloom-A-Thon Lavender produces an outstanding display of soft, silvery-lavender flowers that bloom in spring and then rebloom continuously and prolificacy through summer and well into autumn — often with even more impressive summer rebloom than Encore varieties in comparable conditions.
Its cool, refined lavender color is particularly valuable in the summer garden, providing a sophisticated, calming tone that complements both warm and cool color schemes. It forms a compact, evergreen shrub reaching 3–4 feet.
Bloom-A-Thon Pink Double (Rhododendron Bloom-A-Thon series)
A spectacular double-flowered reblooming azalea from the Bloom-A-Thon series producing fully double, ruffled, soft pink flowers that resemble miniature roses more than traditional azalea blooms, creating a uniquely lush and opulent floral display from spring through summer and into autumn.
The fully double flower form holds up exceptionally well in summer heat, maintaining its ruffled, multi-petalled appearance longer than single-flowered varieties. It is one of the most visually luxurious reblooming azaleas available and forms a compact, dense, evergreen shrub reaching 3–4 feet with outstanding landscape versatility.
Bloom-A-Thon Red (Rhododendron Bloom-A-Thon series)
A vibrant and prolific reblooming azalea producing vivid, true red, single flowers in exceptional abundance from spring through summer and into autumn — the continuous red rebloom performance of this variety making it one of the finest warm-colored reblooming azaleas for summer garden color.
Its bright, clear red flower color is among the most reliably vivid and consistent of any reblooming azalea, maintaining excellent color intensity throughout the summer rebloom period even in warm, humid climates. It forms a compact, rounded, evergreen shrub reaching 3–4 feet with attractive dark green foliage.
Encore Azalea ‘Autumn Starlite’ (Rhododendron ‘Robcou’)
A uniquely beautiful reblooming azalea producing single flowers in pristine white with a delicate, soft lavender-pink blush at the petal centers and margins — a subtle, romantic color combination of extraordinary elegance.
Autumn Starlite blooms abundantly in spring and reblooms continuously through summer and autumn, providing months of cool, refined, pale-toned color that brightens shaded garden positions and combines magnificently with deeper-colored companion shrubs and perennials. Its white-lavender flowers are particularly luminous and effective in evening garden settings. It forms a compact evergreen shrub reaching 3–4 feet.
Encore Azalea ‘Autumn Amethyst’ (Rhododendron ‘Roblee’)
A richly colored reblooming azalea producing single flowers in deep, saturated violet-purple — one of the most intensely colored purple azaleas in the reblooming category — from spring through summer and into autumn.
The deep amethyst-purple flower color of this variety is striking and bold, providing outstanding contrast against the shrub’s dark green evergreen foliage and creating vivid color combinations with pink, white, and red companion plants in the summer garden. It forms a compact, upright-to-rounded evergreen shrub reaching 4–5 feet and is among the hardiest of the Encore azalea varieties.
Encore Azalea ‘Autumn Sangria’ (Rhododendron ‘Robled’)
A deeply colored, richly saturated reblooming azalea producing single flowers in a warm, glowing magenta-rose — the color of deep sangria wine — that bloom from spring through summer and well into autumn with exceptional prolificacy.
The warm, saturated magenta-rose color of Autumn Sangria is one of the most intensely jewel-like tones in the Encore collection, providing outstanding visual impact in the summer border. It forms a compact, dense, upright-to-rounded evergreen shrub reaching 4–5 feet with dark, glossy foliage and is one of the more heat-tolerant varieties in the Encore range.
Encore Azalea ‘Autumn Cheer’ (Rhododendron ‘Roblen3’)
A cheerful, warm-toned reblooming azalea producing single flowers in bright, clear, warm pink — a vibrant, fresh pink tone midway between salmon and rose — from spring through summer and into autumn with outstanding rebloom reliability.
Autumn Cheer is particularly valued for the warmth and brightness of its flower color, which remains vivid and saturated throughout the summer rebloom period without fading in heat. It forms a compact, rounded, evergreen shrub reaching 3–4 feet with dense, attractive foliage and is outstanding for foundation plantings, container culture, and mixed border specimens requiring reliable summer-long color.
Incrediball Azalea / Rhododendron (Rhododendron ‘NCRX2’ — ReBlooms series)
A newer generation reblooming azalea from the ReBlooms series combining outstanding cold-hardiness with prolific, continuous summer rebloom performance — extending the reblooming azalea concept into significantly colder gardening zones than earlier series could tolerate.
It produces single flowers in vivid pink that rebloom with exceptional reliability and abundance throughout summer and autumn. Its improved cold hardiness — performing in USDA zones 5–9 compared to zones 6–9 for most Encore varieties — significantly expands the geographic range of gardeners who can enjoy continuous summer-blooming azalea color in their landscapes.
Encore Azalea ‘Autumn Ivory’ (Rhododendron ‘Robcou2’)
One of the finest white-flowered reblooming azaleas available, Autumn Ivory produces single to semi-double, pure white flowers with a subtle chartreuse-yellow throat that glow with extraordinary luminosity in shaded garden positions from spring through summer and into autumn.
White-flowered reblooming azaleas are among the most versatile and indispensable in mixed landscape plantings, providing a clean, neutral foil that enhances and intensifies the colors of all surrounding plants. Autumn Ivory forms a compact, dense, rounded evergreen shrub reaching 3–4 feet and is outstanding for evening gardens where its white flowers remain visible long after darker-colored varieties have faded into shadow.
Tips for Growing Reblooming Azaleas
Always plant in partial shade to filtered light — reblooming azaleas perform best with morning sun and afternoon shade, which protects flowers from fading and heat stress while providing sufficient light energy for continuous rebloom.
Acidic, well-drained, humus-rich soil with a pH of 4.5–6.0 is essential — amend heavy clay or alkaline soils with generous quantities of pine bark, peat moss, or acidic compost before planting. Never plant too deeply — the root ball crown should sit slightly above surrounding soil level to prevent crown rot.
Water consistently throughout the growing season, particularly during summer rebloom periods when heat and drought can reduce flowering performance significantly.
Feed with an azalea-specific, acid-forming fertilizer in early spring as flower buds swell and again immediately after the spring bloom flush fades to fuel summer rebloom.
Avoid deadheading spent spring blooms — disturbing the growth tips where summer rebloom buds are initiating can significantly reduce summer flowering performance.
Mulch generously with pine bark or pine needle mulch to maintain soil acidity, moderate root temperature, and conserve moisture throughout the summer rebloom season.