The cultivar ‘ Roseum Superbum ’ is a superb , heat and cold kind bush that is hardy to -25 degree F. Spring borne flowers are big , showy , lilac - rose . There are between 500 and 900 metal money of evergreen and deciduous plants in the Rhododendron genus . Azaleas fall into this class . The evergreen rhododendron is characterized by medium to long , elliptical leaves and large , clump , truss of , late , showy , spring to early summer flush , ranging in colour from red , pinkish , white , lavender , purple and even yellow and orange . Form maybe low and mound to gangly and almost tree - ilk with geezerhood . All rhododendrons screw well - drained , acid soil and should be planted high , rather on erect beds . fond spook is preferable too , though many flora grow quite well in full sun in cooler , more forgiving climate . In general , the evergreen rhododendron tends to do better in cooler region of zone 7 and lower , thriving in the Appalachian Mountains and the Pacific Northwest . rhododendron , as a genus , are divide into 5 groups : with child - leaf evergreens ( elepidotes ) – the ironclad cross ( hybrids between R. catawbiense , R. ponticum , R. caucasicum ) , Fortunei hybrids ( tall and shaggy-haired , large flowers ) , Yakushimanum cross ( low and succinct ) , little - leaf evergreens ( lepidote ) . Hardy , low - growers admit R. dauricum and R. minus Vireya rhododendrons . Also known as Malasian rhododendrons ; often epiphytic and tender ; best in greenhouse .
Google Plant Images : cluck here !
Characteristics
Requirements
Plant Care
Fertilizing
Light
Watering
Planting
Pruning deciduous shrubs can be separate into 4 grouping : Those that requireminimal pruning(take out only dead , diseased , damaged , or crossed branch , can be done in early spring.);spring pruning(encourages vigorous , new growth which produce summer flower - in other actor’s line , blossom look on new wood);summer pruning after flower(after flowering , disregard back shoots , and take out some of the old growth , down to the ground);suckering riding habit pruning(flowers seem on wood from previous year . Cut back flowered stem by 1/2 , to potent grow new shoots and remove 1/2 of the flowered stems a couple of inches from the ground ) Always remove dead , damaged or pathologic wood first , no matter what type of pruning you are doing .
representative : Minimal : Amelanchier , Aronia , Chimonanthus , Clethra , Cornus alternifolia , Daphne , Fothergilla , Hamamelis , Poncirus , Viburnum . springiness : Abelia , Buddleia , Datura , Fuchsia , Hibiscus , Hypericum , Perovskia , Spirea douglasii / japonica , Tamarix . summertime after flower : Buddleia alternifolia , Calycanthus , Chaenomeles , Corylus , Cotoneaster , Deutzia , Forsythia , Magnolia x soulangeana / stellata , Philadelphus , Rhododendron sp . , Ribes , Spirea x arguta / prunifolia / thunbergii , Syringa , Weigela . Suckering : KerriaHow - to : Planting ShrubsDig a hole twice the size of it of the etymon globe and bass enough to plant at the same grade the shrub was in the container . If soil is poor , dig hole even full and fill with a mixture half original soil and one-half compost or soil amendment .
cautiously remove shrub from container and gently disjoined rootage . Position in center of hole , best side facing forward . Fill in with original soil or an amend commixture if require as described above . For with child shrubs , make a water well . Finish by mulch and watering well .
If the plant is balled - and - burlapped , remove fastener and pen up back the top of natural burlap , insert it down into gob , after you ’ve place shrub . verify that all burlap is buried so that it wo n’t wick water away from rootball during spicy , dry periods . If synthetic burlap , remove if possible . If not possible , curve away or make slits to reserve for roots to develop into the new territory . For larger shrubs , build a water well . Finish by mulching and watering well .
If shrub is bare - theme , look for a discoloration somewhere near the base ; this scratch is probable where the dirt tune was . If soil is too sandlike or too clayey , add constituent subject . This will help with both drainage and urine holding capacity . Fill grease , firming just enough to endorse bush . Finish by mulch and watering well . How - to : Sow SeedNow is the preferred time to inseminate seeded player .
Problems
potential control : keep widow’s weeds down ; use screening in window to keep them out ; get rid of infest plants forth from non - infested plant life ; utilise a broody mulch ( aluminum foil ) under plant ( this repels whitefly ) ; bunker with chicken sticky cards , put on labeled pesticide ; encourage natural enemy such as parasitic wasps in the garden ; and sometimes a good unbendable shower of water will dampen them off the plant . Pest : AphidsAphids are small , lenient - embodied , slow - moving insects that fellate fluids from plants . Aphidscome in many colors , ranging from immature to brown to black , and they may have wings . They attack a wide range of plant metal money induce stunting , distort leaves and buds . They can transmit harmful works virus with their pierce / sucking mouthpart . Aphids , generally , are merely a pain in the neck , since it takes many of them to cause serious works price . However aphids do produce a scented pith called honeydew ( coveted by ants ) which can lead to an unattractive black control surface growth called sooty moulding .
Aphids can increase quickly in numbers and each female can bring about up to 250 live nymph in the course of a calendar month without mating . Aphids often appear when the environment changes - spring & fall . They ’re often mass at the tips of branches feeding on succulent tissue . aphid are attracted to the colouring material yellowness and will often hitchhike on yellow clothing .
Prevention and Control : Keep weeds to an absolute minimum , especially around suitable industrial plant . On edibles , wash off infected area of works . Lady bugs and lacewing fly will feast on aphids in the garden . There are various products - constitutive and inorganic - that can be used to contain aphid . try the testimonial of a professional and espouse all recording label procedures to a tee . fungus kingdom : RustsMostrustsare host specific and overwinter on leave , stems and spent flower detritus . Rust often appears as small-scale , bright orange , yellowish , or brown pustule on the bottom of leaves . If touched , it will leave a coloured spot of spores on the finger . due to fungi and spread by splashing water or rain , rust is bad when conditions is moist .
Prevention and Control : Plant resistant varieties and provide maximum atmosphere circulation . Clean up all debris , especially around plants that have had a problem . Do not water from overhead and H2O only during the day so that plants will have enough meter to dry out before night . implement a fungicide labeled for rusting on your plant . Fungi : Powdery MildewPowdery Mildewis usually recover on plant that do not have enough melodic phrase circulation or adequate sparkle . Problems are sorry where nights are cool and Day are warm and humid . The powdery whitened or gray fungus is usually found on the upper Earth’s surface of leave or yield . leave will often turn yellow or chocolate-brown , wave up , and overlook off . New foliage go forth crinkled and distorted . Fruit will be dwarfed and often drops early .
Prevention and Control : imbed resistant variety and space plants properly so they invite adequate luminance and air circulation . Always weewee from below , keeping water off the leaf . This is paramount for roses . Go soft on the atomic number 7 plant food . implement antifungal agree to recording label directions before job becomes serious and play along focusing exactly , not missing any required treatments . Sanitation is a must - cleanse up and take away all leaves , flowers , or detritus in the fall and destroy . Pest : CaterpillarsCaterpillars are the immature form of moths and butterfly stroke . They are voracious feeders attacking a wide variety of plant . They can be extremely destructive and are characterized as leaf feeders , stem borer , leaf tumbler , cutworm and tent - former .
Prevention and Control : keep weeds down , scout individual plants and take cat , go for labeled insecticides such as liquid ecstasy and oils , take vantage of natural foeman such as parasitic wasps in the garden and habituate Bacillus thuringiensis ( biological warfare ) for some caterpillar species . disease : Pythium and Phytophtora Root RotRot Rot , PythiumorPhytophthoraoccurs when soil wet levels are excessively gamy and fungous spores present in the ground , total in striking with the susceptible plant . The base of stems discolor and shrink , and leaves further up the stalk wilt and give-up the ghost . Leaves near base are affected first . The root will work black and waste or break in . This fungi can be introduce by using unsterilized soil mix or contaminated water .
Prevention and ControlRemove move plants and their roots , and discard surrounding grunge . Replace with plant that are not susceptible , and only employ new , sterilized soil mix . concur back on fertilizing too . try out not to over water plants and make indisputable that stain is well drained prior to planting . This fungus is not treatable by chemical .
Rhizoctonia Root and Stem Rot symptoms look like to Pythium Root Rot , but the Rhizoctonia fungus seems to fly high in well drained stain . blighter : Scale InsectsScales are insect , associate to mealy bug , that can be a job on a wide variety of plant life - indoor and outdoor . immature scales crawl until they find a good feeding site . The grownup female then drop off their legs and continue on a spot protected by its hard shell layer . They look as protuberance , often on the low sides of leaves . They have pierce mouth part that suck the sap out of plant life tissue paper . Scales can weaken a industrial plant conduct to chicken foliage and folio drop . They also produce a sweet substance call honeydew ( coveted by ants ) which can lead to an unattractive black airfoil fungal growth called sooty mold .
Prevention and Control : Once establish they are hard to control . Isolate infested plants aside from those that are not infested . confer with your local garden inwardness professional or Cooperative Extension office in your county for a legal passport regarding their control . Encourage natural opposition such as bloodsucking wasps in the garden . Diseases : BlightBlights are cause by fungi or bacterium that kill plant life tissue . symptom often show up as the speedy spotting or wilting of foliage . There are many different blights , specific to various industrial plant , each want a wide-ranging method acting of mastery . Pest : LacebugsLacebugsare white to pale brown , 1/8 inch long , rectangular in shape with have lacy wings and usually found on the bottom of leaves where they suck sap . nymph may appear spiny and darker than adult . Lacebugs , which do not fly , are sometimes confuse with whiteflies that do fly . harm ordinarily appears as stipples or " " bleached - look " " blot on the leaves . Hard , pitch-black excretion can usually be found on the undersurface of leaf . legal injury is most visible during the summer , specially on tree . Flowering bush , though alive , appear weak and almost exanimate .
Prevention and Control : If plague is mild , wash away with a jet of oleaginous water or prune aside infest leaf or limbs . Timing is important : spray according to the Growing Degree Days ( GDD ) in your area . To control insects , spray underside of leaves with a recommended insecticide harmonise to label counseling . Conditions : ChlorosisEntire parting or orbit around vein in leaves come out yellow . This is the consequence of decreased iron uptake from the grease due to high pH or waterlogged soil . It is crucial to know the pH requirement of industrial plant . Prior to planting , amend grease to ameliorate drainage and adjust pH , if necessary . Chlorosis is common in plants grow closely to concrete or plant in alkaline soils . Treat with an iron supplement harmonise to recording label directions .
