True red semi-double flowers glowing against dark green foliage, on the most compact Encore at 1 to 3 feet tall and 2 to 4 feet wide. Rhododendron 'Robleza', sold as Encore Autumn Bonfire®, grows in full sun to part sun, hardy from Zone 6 through Zone 10.
The doubling gives the flowers more substance than the singles, and the red is a genuine red rather than a red-leaning pink. At this size it fits a container, a narrow bed, or the front edge of a border.
Encore azaleas can flower up to three times a year. A traditional azalea blooms for a couple of weeks in spring and then stops, while Encores set buds on new growth through the season and bloom again in summer and once more in fall. Spring and fall give the strongest shows, with the summer flush lighter and more scattered. They also take more sun than most azaleas.
Azaleas want acidic soil, roughly pH 4.5 to 6.0, with good drainage and steady moisture. Mulch the shallow roots.