Rhododendron maximum is an evergreen shrub growing to 4 m (13 ft), rarely 10 m (33 ft), tall. Pruning. Order today! The flowers are 2.5–3 cm (1 in) diameter, white, pink or pale purple, often with small greenish-yellow spots. Gardenality is a gardening-centric site made by gardeners for gardeners with tools that enhance any gardening for the expert to the weekend gardener. Prefers cooler regions but some protection from winter wind is helpful. Requires well-drained, acidic soils. The leaves are 9–19 cm (3–8 in) long and 2–4 cm (0.75-1.5 in) broad. Both methods require patience- azaleas and rhododendrons are not known for setting the world on fire in growth rates. Light pruning helps control the growth habit of a rhododendron so that it retains a desired shape or doesn't outgrow its location. Blooming in mid to late spring, each trumpet-shaped flower is delicately splashed with deep maroon blotches on their upper lobes. A compact, smaller growing evergreen shrub. Rhododendrons are shallow rooted, so keep them well mulched with acidic mulches like pine needles and pull any weeds that dare invade it's space. It has deep, wide-spread roots and is a good choice for binding soil at the top or base of a slope. Growth rate: moderate Form: coniferous evergreen to 260 feet; deep, extensive root system. Basically it comes down to a choice of two basic methods- gradual or drastic reduction. Since the high growth rates are the most prominent fea- ture of the Irish populations, they are quite probably the decisive factor to explaining the invasion success of Rhododendron ponticum. Excellent for shade gardens or in a sheltered site. zones 4 to 8 for Rhododendrons and the most cold-hardy Azaleas, but most Azaleas are only cold hardy to zones 5 or 6, with some only tolerant of Winters in zones 7, 8, or even 9 (and are restricted to mild Winter regions or are used as indoor flowering plants) Trust us, if you love the look of Anah Kruschke, taking these steps is well worth the time. Native to southeastern United States. Provides seeds, cover, and nesting sites for wildlife. Sun Preference Full sun is the ideal condition for this tree, meaning it should get at least six hours of direct, unfiltered sunlight each day. Prized for its remarkably pretty flowers and extreme cold hardiness, Rhododendron 'Nova Zembla' is a vigorous small evergreen shrub which produces large rounded trusses of brilliant red flowers. Growth Rate This tree grows at a medium rate, with height increases of 13–24" per year. Use as an accent or specimen. 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