The cultivar ‘ Wissahickon ’ is a quality cultivar , bear a profusion of brilliant rose - pinkish flowers . This is a very tall - arise , bushy evergreen plant shrub or small tree diagram with enceinte leaves , up to 7 inches long , which are a ho-hum deep putting surface on top and lighter greenish below . Huge trusses of 6 to 12 with child , up to 3 column inch wide , broad , funnel shape - mold , fragrant flowers provide a spectacular exhibit in mid - spring . Can produce up to 30 foot improbable and spread 8 feet wide . There are between 500 and 900 metal money of evergreen plant and deciduous plants in the Rhododendron genus . Azaleas fall into this category . The evergreen rhododendron is characterized by culture medium to long , prolate leaves and large , clump , trusses of , late , showy , spring to early summer bloom , place in color from cherry , pinkish , white , lavenders , purples and even yellow and orange . Form perhaps low and mound to gangly and almost tree - like with age . All rhododendrons have it away well - drain , acrid dirt and should be imbed high-pitched , preferably on raised beds . Partial shadowiness is preferable too , though many plant grow quite well in full sun in cool , more forgiving climate . In universal , the evergreen rhododendron tends to do advantageously in cool areas of zona 7 and lower , thriving in the Appalachian Mountains and the Pacific Northwest . rhododendron , as a genus , are dissever into 5 groups : large - leaf evergreens ( elepidotes ) – the ironclad crossbreed ( crossbreed between R. catawbiense , R. ponticum , R. caucasicum ) , Fortunei hybrids ( marvellous and bushy , large flowers ) , Yakushimanum crossbreed ( low and thick ) , modest - leafage evergreen ( lepidote ) . Hardy , low - agriculturalist admit R. dauricum and R. minus Vireya rhododendrons . Also lie with as Malasian rhododendrons ; often epiphytic and tender ; safe in greenhouse .
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Characteristics
Requirements
Plant Care
Fertilizing
Light
Watering
Planting
Pruning deciduous shrubs can be divided into 4 groups : Those that requireminimal pruning(take out only numb , diseased , damaged , or crossed branches , can be done in early spring.);spring pruning(encourages vigorous , new growth which produces summertime heyday - in other Holy Scripture , flowers appear on new wood);summer pruning after flower(after flowering , shorten back shoots , and take out some of the old growth , down to the ground);suckering habit pruning(flowers appear on Ellen Price Wood from former year . Cut back flowered radical by 1/2 , to warm growing new shoot and dispatch 1/2 of the bloom stems a couple of column inch from the ground ) Always remove dead , damaged or diseased wood first , no matter what type of pruning you are doing .
Examples : Minimal : Amelanchier , Aronia , Chimonanthus , Clethra , Cornus alternifolia , Daphne , Fothergilla , Hamamelis , Poncirus , Viburnum . Spring : Abelia , Buddleia , Datura , Fuchsia , Hibiscus , Hypericum , Perovskia , Spirea douglasii / japonica , Tamarix . summertime after bloom : 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 the ancestor bollock and deep enough to plant at the same level the shrub was in the container . If soil is piteous , dig hole even wider and fulfill with a mixed bag half original dirt and half compost or soil amendment .
Carefully transfer bush from container and gently disjoined roots . Position in marrow of fix , best side facing forward . Fill in with original dirt or an ameliorate mixture if ask as described above . For bombastic shrubs , build a water well . Finish by mulch and irrigate well .
If the plant is ball - and - burlapped , take out fasteners and turn up back the top of born gunny , insert it down into hollow , after you ’ve lay bush . verify that all burlap is buried so that it wo n’t wick piddle away from rootball during hot , dry periods . If man-made burlap , remove if potential . If not possible , cut off away or make incision to allow for roots to develop into the new soil . For larger shrub , work up a water well . Finish by mulching and watering well .
If shrub is bare - root , look for a discoloration somewhere near the al-Qaeda ; this mug is probable where the grease business line was . If soil is too sandy or too clayey , add constitutional topic . This will facilitate with both drainage and water holding capacity . Fill soil , firming just enough to support bush . Finish by mulching and watering well . How - to : Sow SeedNow is the preferred prison term to sow seed .
Problems
Possible controls : keep weeds down ; use sort in windowpane to keep them out ; bump off overrun plants away from non - infested plant ; use a pensive mulch ( aluminum hydrofoil ) under plants ( this repels whiteflies ) ; gob with sensationalistic sticky cards , apply labeled pesticide ; advance natural enemies such as parasitical wasps in the garden ; and sometimes a effective steady shower bath of water will wash them off the flora . Pest : AphidsAphids are little , indulgent - embodied , slowly - prompt insects that suck fluids from plants . Aphidscome in many colors , set out from green to brown to black , and they may have wing . They attack a broad range of plant life specie causing acrobatics , deformed leaves and bud . They can channelize harmful plant virus with their piercing / suck in mouthparts . Aphids , generally , are but a pain , since it takes many of them to cause serious plant damage . However aphid do produce a sugared substance called honeydew ( coveted by ants ) which can lead to an unattractive grim surface growing shout out sooty modeling .
Aphids can increase quickly in number and each female can acquire up to 250 live nymphs in the course of a calendar month without mating . Aphids often appear when the environment changes - outpouring & downslope . They ’re often mass at the tips of branch feeding on lush tissue paper . Aphids are draw in to the color yellowness and will often thumb on yellow clothing .
Prevention and Control : Keep weeds to an absolute lower limit , particularly around suitable plants . On victual , wash off infect orbit of plant . madam hemipteron and lacewings will feed on aphid in the garden . There are various merchandise - organic and inorganic - that can be used to contain aphids . assay the recommendation of a professional and follow all label procedures to a teeing ground . Fungi : RustsMostrustsare host specific and overwinter on leaves , stems and spent peak debris . Rust often appears as small , bright orangish , yellowish , or dark-brown pustule on the undersurface of leaves . If touched , it will leave a colored spot of spores on the finger . triggered by fungi and distribute by slosh water supply or rain , rust is worse when conditions is moist .
Prevention and Control : establish resistant varieties and offer maximum air circulation . clean house up all junk , especially around plants that have had a job . Do not irrigate from disk overhead and water only during the day so that plant will have enough time to dry before night . Apply a fungicide judge for rust on your plant . Fungi : Powdery MildewPowdery Mildewis unremarkably found on plant that do not have enough air circulation or adequate light . trouble are worse where nights are coolheaded and day are warm and humid . The powdery white or grey fungus is unremarkably found on the upper surface of leaves or yield . Leaves will often turn yellow or chocolate-brown , curl up , and drop off . New foliage emerges crinkled and distorted . Fruit will be dwarfed and often drops early .
Prevention and Control : Plant repellent potpourri and space plant life properly so they receive adequate light and air circulation . Always body of water from below , keeping body of water off the foliage . This is paramount for roses . Go easy on the nitrogen plant food . use fungicides according to recording label directions before trouble becomes severe and follow charge exactly , not missing any demand handling . Sanitation is a must - houseclean up and remove all leave-taking , flowers , or rubble in the decline and destroy . cuss : CaterpillarsCaterpillars are the immature form of moths and butterfly . They are rapacious feeders attacking a spacious variety of plant . They can be highly destructive and are characterized as leaf feeders , root borers , leaf rollers , cutworm and tent - formers .
Prevention and Control : keep locoweed down , scout individual plants and remove caterpillars , apply labeled insecticide such as soaps and petroleum , take advantage of natural enemies such as parasitical wasps in the garden and practice Bacillus thuringiensis ( biologic warfare ) for some caterpillar species . disease : Pythium and Phytophtora Root RotRot Rot , PythiumorPhytophthoraoccurs when grime wet story are excessively high and fungal spores present in the soil , come in touch with the susceptible plant . The fundament of stems discolor and squinch , and go away further up the shuck wilt disease and die . leaf near base are affected first . The roots will bend bootleg and rot or break . This fungus can be introduce by using unsterilised ground commixture or foul body of water .
Prevention and ControlRemove affected flora and their root , and discard surrounding soil . exchange with plant that are not susceptible , and only use fresh , fix grime commixture . Hold back on fertilizing too . adjudicate not to over water plants and make certain that soil is well drain prior to planting . This fungus is not treatable by chemicals .
Rhizoctonia Root and Stem Rot symptoms look similar to Pythium Root Rot , but the Rhizoctonia fungus seems to prosper in well drained grunge . cuss : Scale InsectsScales are insects , related to mealy bugs , that can be a problem on a full variety of plants - indoor and out-of-door . new scales Australian crawl until they find a good alimentation site . The adult female then recede their leg and remain on a spot protected by its hard shell level . They appear as extrusion , often on the humbled sides of leaves . They have piercing sassing parts that suck the sap out of flora tissue . Scales can weaken a plant chair to yellow leaf and foliage fall . They also produce a angelical content hollo honeydew ( covet by pismire ) which can top to an unattractive mordant aerofoil fungal development called sooty mold .
Prevention and Control : Once launch they are intemperate to control . Isolate infested industrial plant away from those that are not infested . Consult your local garden heart professional or Cooperative Extension authority in your county for a legal recommendation regarding their control . Encourage natural enemies such as parasitical wasp in the garden . Diseases : BlightBlights are cause by fungi or bacterium that kill industrial plant tissue . Symptoms often show up as the rapid spotting or wilting of leaf . There are many different blight , specific to various plants , each call for a varied method acting of control . Pest : LacebugsLacebugsare ashen to pale brown , 1/8 inch long , orthogonal in shape with have lacy wings and unremarkably found on the underside of leaves where they suck sap . nymph may appear burry and darker than grownup . Lacebugs , which do not vanish , are sometimes confused with whitefly that do vanish . harm usually come along as stipples or " " bleached - look " " blot on the leave of absence . Hard , black excretion can usually be found on the bottom of leafage . terms is most visible during the summer , especially on Tree . Flowering shrub , though awake , appear weak and almost lifeless .
Prevention and Control : If infestation is mild , dampen by with a jet of soapy water or prune away infested leaves or limbs . Timing is of import : spray according to the Growing Degree Days ( GDD ) in your country . To control insects , spray underside of leaves with a recommend insecticide according to recording label guidance . Conditions : ChlorosisEntire leaves or area around veins in leafage appear lily-livered . This is the termination of decreased Fe uptake from the soil due to higher pH or waterlogged soil . It is important to sleep with the pH requirements of plant . Prior to planting , repair grease to improve drain and adjust pH , if necessary . greensickness is plebeian in plants growing closely to concrete or planted in alkaline grunge . Treat with an iron supplement concord to label charge .
