Basically it comes down to a choice of two basic methods- gradual or drastic reduction. Prefers cooler regions but some protection from winter wind is helpful. It has deep, wide-spread roots and is a good choice for binding soil at the top or base of a slope. 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) Requires well-drained, acidic soils. Rhododendron maximum is an evergreen shrub growing to 4 m (13 ft), rarely 10 m (33 ft), tall. 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. Valued for its large trusses of bright pink flowers with darker edges and orange spotting. The leaves are 9–19 cm (3–8 in) long and 2–4 cm (0.75-1.5 in) broad. 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. Grand fir is adapted to a wide range of habitats and is drought tolerant. 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. The results confirmed our first hypothesis that Irish populations show higher growth rates than native ones. Description. Gardenality is a gardening-centric site made by gardeners for gardeners with tools that enhance any gardening for the expert to the weekend gardener. Native to southeastern United States. Both methods require patience- azaleas and rhododendrons are not known for setting the world on fire in growth rates. The flowers are 2.5–3 cm (1 in) diameter, white, pink or pale purple, often with small greenish-yellow spots. Catawba rhododendron is a large-leaved, evergreen shrub reaching 6 to 10 feet high with large, lilac-purple flowers borne in clusters (trusses) in mid-to late spring. slow growth rate and establishment Habitat. The fruit is a dry capsule 15–20 mm (.60-.79 in) long, containing numerous small seeds. Growth Rate This tree grows at a medium rate, with height increases of 13–24" per year. Badly overgrown plants took some time getting there … Provides seeds, cover, and nesting sites for wildlife. Light pruning helps control the growth habit of a rhododendron so that it retains a desired shape or doesn't outgrow its location. 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. Excellent for shade gardens or in a sheltered site. Growth rate: moderate Form: coniferous evergreen to 260 feet; deep, extensive root system. 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