Rhododendron macrophyllum , commonly known as the Coast Rhododendron or Pacific Rhododendron , is a member of theRhododendrongenus within the Ericaceae crime syndicate , which is also known as the heath or heather menage . This species is characterized by its big , leathery leaves and showy , bell - shaped bloom . The species name “ macrophyllum ” is infer from Greek , intend “ large - leaved , ” which report one of its striking features .
The Coast Rhododendron is native to the Pacific Northwest of North America , with its range extending from British Columbia in Canada , south through Washington , Oregon , and into parts of California . It flourishes in coastal and flock forest habitats , often found in the understory of coniferous forests where it benefits from the partial shade and the acidic , well - drained soils typical of these regions .
Historically , Rhododendron macrophyllum has had ethnical import among Native American kin group in its aboriginal range . It was used for medicinal purposes , with the leaves and bark apply to plow various ailments like colds and rheumatism . Its aesthetic appeal also made it a topic of interest for early settlers and botanists , leading to its widespread use in horticulture as one of the first North American rhododendron mintage to be cultivated . Its ravisher and the dumb clustering of pinko to lavender flowers have made it a symbol of the Pacific Northwest ’s natural heritage , often observe in regional festivals and garden .
Coast Rhododendron is well - adapt to USDA Hardiness Zones 7 through 9 . This mountain chain reflects its ability to handle both the balmy , besotted winters and the comparatively coolheaded , often foggy summer of the Pacific Northwest . As for life , Rhododendron macrophyllumcan live for many decades , with some specimen hit over 100 years under optimum conditions . Its longevity is supported by its slow growth rate , cryptical ascendant system of rules , and adaptation to its native environment , although this can depart based on culture practices , dirt atmospheric condition , and clime changes .
Coast Rhododendron (Rhododendron macrophyllum ): Characteristics
Coast Rhododendron (Rhododendron macrophyllum ): Cultivation
Site Selection
opt a site with fond shade , especially in warm climate , though it can tolerate full sunlight if adequately watered and not subject to uttermost high temperature . Mimic its natural home ground with dappled brightness level .
Soil Preparation
call for acid , well - drained soil . ameliorate stain with constitutional matter like composted pine needle or peat moss to lower pH if necessary . Good drainage is essential to keep solution rot .
Planting
Plant in spring or early fall to avoid extreme temperature . Dig a hole twice as wide as the etymon ball but no deeper . see to it the beginning ball sits just above or level with the soil surface to preclude water accumulation around the roots .
lachrymation
urine thoroughly after plant , and keep stain systematically moist but not waterlogged . Rhododendrons have shallow roots and require regular watering , especially during ironic go , but avoid overwatering .
Mulching
lend oneself a layer of acidic mulch ( for instance , pine bark , wood chips ) to avail hold dirt moisture , observe soil acidity , and suppress dope . Keep mulch away from the fore to preclude rot .
Fertilization
fecundate in former spring with a slow - vent , dot - have a go at it plant plant food . keep off high - atomic number 7 fertilizers which can upgrade leaf growth at the expense of flowers .
Pruning and Maintenance
Prune just after bloom to regulate or remove dead or diseased woods . annul heavy pruning as it bloom on erstwhile wood . Deadheading can encourage more vigorous growth for the next season .
Pest and Disease Management
watch over for vulgar rhododendron pests like lace bugs , weevils , and fungal diseases in wet conditions . Good air circulation , proper watering , and avoiding overcrowding can foreclose many issues . apply targeted treatments if problems spring up .
extension
Can be propagated by seeded player , but this is time - consuming and less honest for keep up desired traits . Layering or taking semi - hardwood cuttings in late summer to early capitulation is more efficient .
Winter Care
In its hardiness zones , no special winter precaution is typically require . However , in colder part of its range or during outstandingly harsh wintertime , a protective mulch layer can serve shield roots from freezing .
