Dig a hole as deep as the root ball and 2 times as wide. When to Plant Azaleas. Read on for information about azalea plant propagation, including how to root azalea cuttings. Plant deciduous and evergreen azaleas while they are dormant.In warm, mild-winter climates of USDA zones 8 and 9, B&B and container-grown azaleas should be planted between November and February. A woodland area is an ideal planting location for azaleas; it naturally provides the shade and soil the shrub thrives in. The spectacular spring flowers of azaleas and rhododendrons make them among the most popular garden shrubs. HOW TO PLANT RHODODENDRON. Space plants 2 to 6 feet apart, depending on their estimated mature size. Deciduous azaleas also grow taller, reaching around eight to fifteen feet, compared to evergreens, which can only grow up to six feet. A month after planting, begin feeding azaleas with Miracle-Gro® Water Soluble Azalea, Camellia, Rhododendron Plant Food. They were originally developed in about 1870 by Anthony Waterer at his nursery in Knap Hill, England, but the plants did not become widely available until 1924. These plants do best in well-drained acidic soil, with a pH between 4.5-6.0. In tropical zones, azaleas will bloom in full shade. The only way to be certain you’ll get clones of a favorite azalea is to propagate them vegetatively from azalea stem cuttings. In some areas, the pest most likely to be the culprit is deer. Since azaleas are not deer-resistant shrubs, it is entirely possible that Bambi came onto your property for a midnight snack one night and ate the flower buds right off your poor plant. Plant azaleas in early spring; just before the new growth starts begins. Hybrid Deciduous Azaleas. Ghent azaleas are hybrids developed in Belgium about 150 years ago resulting from crosses between several American azalea species and R. luteum.Their single flowers, with one ring of petals, or double flowers, with numerous overlapping petals, are 1 1/2 to 2 inches across and come in white and in shades of yellow, orange, pink and red. Azaleas typically bloom early in the growing season, lavishing landscapes with copious mounds of white, pink, salmon, and lavender flowers. Except, here, it is the pest that does the "pruning," not the gardener. Some deciduous azaleas add bright fall color before the leaves drop. Knap Hill and Exbury Azaleas are by far the most popular of deciduous, hybrid Azaleas grown in North America. Azaleas prefer to grow in acidic soil; under taller shrubs and trees. Planting Guides How to Plant Deciduous Trees . You can grow azaleas from seeds, but that’s not your best bet if you want your new plants to resemble the parent. Azaleas are usually sold as container-grown plants or have a ball of soil to protect their delicate roots. They thrive near and even beneath shade trees, unlike most flowering shrubs. Deciduous trees lose their foliage during winter, bursting to life with new growth once spring arrives. In addition to the main plant nutrients, this fertilizer also includes micronutrients such as iron, manganese, and zinc, which are vital for growing azaleas (and other acidic soil-loving plants). After Azaleas bloom they start to form a seed pod that stays on the plant all summer as the seeds inside the pod develop and mature. Deciduous, Hybrid Azaleas. Many types of deciduous trees bring color to an otherwise dull landscape in fall with their brilliant leaf colors in hues of purple, yellow, orange and red. Plant in spring or early fall. Growing Exbury Deciduous Azaleas from Seed. Plant in a site that receives afternoon shade, especially in hot areas. 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