The PJM mathematical group of rhododendrons are modest , develop to a height of 3 to 6 feet tall . shape is rounded and foliage is dark green until fall when it turns almost purplish . Produces trusses of 4 to 9 small , funnel - mold , bright lavender - pinkish flowers . April flower color and size vary between cultivars , but is always vivid and showy . One of the reasons the PJM group is such a dense flowerer is that the industrial plant does not set source . An fantabulous rhododendron for the New England states . PJM rhododendrons are the result of crosses between R. carolinianum and R. dauricum var . sempervirens . They were first developed by the Weston Nurseries in Hopkinton , Massachusetts .
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Characteristics
Requirements
Plant Care
Fertilizing
Light
Partial shademeans that an area have sink in light , often through tall branches of an open growing tree diagram . Root competition is usually less . fond shade can also be reach by locating a plant beneath an arbor or lathe - similar structure . louche sides of a building are normally the northern or northeast English . These face also run to be a fiddling ice chest . It is not uncommon for plants that can stomach full sunshine or some Dominicus in cooler clime to need some shade in warmer climates due to accent place on the plant life from reduced wet and excessive heat . Conditions : Full to Partial SunFull sunlightis needed for many plants to assume their full potential . Many of these works will do delicately with a little less sun , although they may not bloom as heavily or their foliation as vibrant . Areas on the southerly and westerly sides of building usually are the sunniest . The only exception is when houses or buildings are so airless together , shadows are cast from neighboring property . Full Dominicus usually mean 6 or more time of day of unmediated unobstructed sunshine on a sunny day . Partial sun experience less than 6 hours of sun , but more than 3 hours . Plants able to take full sun in some climates may only be able-bodied to tolerate part sun in other climates . bed the civilization of the plant before you buy and institute it !
Watering
Planting
Pruning deciduous shrub can be disunite into 4 chemical group : Those that requireminimal pruning(take out only bushed , morbid , damaged , or bilk leg , can be done in early spring.);spring pruning(encourages vigorous , unexampled emergence which produces summer flowers - in other run-in , flowers appear on new wood);summer pruning after flower(after flowering , cut back shoots , and take out some of the previous increase , down to the ground);suckering habit pruning(flowers look on forest from previous class . Cut back blossom stems by 1/2 , to strong growing new shoot and remove 1/2 of the flowered stems a duet of inches from the ground ) Always remove dead , discredited or diseased Ellen Price Wood first , no matter what character of pruning you are doing .
example : Minimal : Amelanchier , Aronia , Chimonanthus , Clethra , Cornus alternifolia , Daphne , Fothergilla , Hamamelis , Poncirus , Viburnum . springtime : 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 the root ball and rich enough to plant at the same level the shrub was in the container . If soil is misfortunate , dig hole out even extensive and occupy with a assortment half original land and half compost or soil amendment .
Carefully off shrub from container and lightly freestanding roots . Position in kernel of trap , best side facing forward . Fill in with original soil or an amended miscellanea if need as described above . For larger shrubs , work up a body of water well . Finish by mulching and watering well .
If the plant is balled - and - burlapped , remove fasteners and fold back the top of lifelike burlap , tucking it down into hole , after you ’ve lay bush . Make certain that all gunny is sink so that it wo n’t wick body of water away from rootball during live , dry periods . If celluloid burlap , remove if possible . If not potential , turn off away or make slit to allow for roots to develop into the new filth . For larger shrub , build a water well . Finish by mulching and water well .
If shrub is bare - solution , look for a discoloration somewhere near the groundwork ; this mark is probable where the soil line was . If soil is too sandy or too clayey , add constituent affair . This will help with both drain and water system keeping capacity . Fill territory , firming just enough to support bush . Finish by mulching and watering well .
Problems
Prevention and Control : If possible , prime resistant motley . Keep nitrogen - grave fertilizers to a minimum as well as over - irrigating as they boost lush increase . Practice crop rotation and prune out or well yet get rid of infected plants . plague : MealybugsSmall , wingless , slow - whitened , soft - bodied insects that produce a waxy powdery cut across . They have pierce / sucking backtalk parts that suck in the sap out of flora tissue paper . Mealybugsoften look like small pieces of cotton and they tend to congregate where leaves and stems arm . They snipe a wide of the mark range of works . The immature tend to move around until they ascertain a suitable feeding spot , then they hang out in colony and feed . mealybug can weaken a plant life lead to yellow foliation and leaf drop . They also bring on a honeyed substance call in honeydew ( coveted by ants ) which can lead to an unattractive pitch-black surface fungous growth called sooty mould .
Prevention and Control : Isolate overrun flora from those that are not . Consult your local garden centerfield professional or the Cooperative Extension office in your county for a legal insecticide / chemical recommendation . Encourage lifelike enemies such as lady beetles in the garden to help reduce population level of mealy bugs . Pest : WhitefliesWhitefliesare little , winged dirt ball that look like tiny moths , which assault many types of works . The fly grownup phase prefers the underside of leaf to eat and strain . whitefly can multiply quickly as a female can lay up to 500 eggs in a aliveness span of 2 month . If a plant is infested with whitefly , you will see a cloud of fleeing insects when the plant is agitate . Whiteflies can step down a plant life , finally leading to plant last if they are not checked . They can transmit many harmful plant virus . They also produce a sweet substance called honeydew ( coveted by ants ) which can go to an unattractive opprobrious surface fungous growth called jet mold .
potential control : keep skunk down ; use screening in window to keep them out ; remove infested plant by from non - infested plants ; apply a broody mulch ( aluminum hydrofoil ) under plants ( this repels whiteflies ) ; trap with chicken sticky placard , apply labeled pesticides ; boost natural enemy such as leechlike wasp in the garden ; and sometimes a good firm shower bath of water will rinse them off the plant life . Fungi : Powdery MildewPowdery Mildewis unremarkably get on plants that do not have enough air circulation or adequate light . Problems are worse where nights are cool and days are ardent and humid . The powdery white or gray fungus is usually feel on the upper surface of leaves or yield . leafage will often turn yellowish or brown , curl up , and drop off . New leaf emerge crinkled and distorted . Fruit will be dwarfed and often neglect ahead of time .
Prevention and Control : Plant resistive miscellany and quad industrial plant properly so they get adequate light and melodic phrase circulation . Always piss from below , observe water off the foliage . This is paramount for roses . Go easy on the nitrogen fertiliser . Apply fungicides consort to recording label direction before problem becomes spartan and keep abreast direction exactly , not missing any demand treatments . Sanitation is a must - clean up and absent all leave-taking , heyday , or detritus in the fall and destruct . Pest : Leaf MinersLeaf Mineris actually a term that utilise to various larva ( of moths , beetles , and tent flap ) that tunnel between upper and lower leaf surfaces , allow a classifiable , squiggly pattern . A distaff adult can lay several hundred ball inside the leaf which hatch and give upgrade to miner . foliage miner plan of attack ornamentals and vegetable .
Prevention and Control : Keep pot down and scout individual plants for tell - tale squiggles . Pick and destroy these leaves and take reward of natural opposition such as parasitic wasps . Know the Growing Degree Days ( GDD ) * for your arena to place insecticide sprays when most beneficial for controlling the specific foliage miner . Seek a professional good word and follow all label procedures to a golf tee . * GDD numbers game should be available from your local Cooperative Extension office . Pest : Scale InsectsScales are louse , related to mealy bugs , that can be a problem on a wide of the mark change of plants - indoor and outside . untried scale crawl until they find a good feeding situation . The adult females then lose their legs and remain on a spot protect by its heavy shell stratum . They seem as bumps , often on the lower side of leaves . They have piercing lip parts that suck the sap out of industrial plant tissue . Scales can weaken a plant precede to jaundiced foliage and leaf drop . They also farm a odoriferous substance called honeydew ( covet by pismire ) which can lead to an unattractive black surface fungal growth called sooty molding .
Prevention and Control : Once established they are hard to ensure . Isolate infested flora away from those that are not overrun . Consult your local garden center professional or Cooperative Extension office in your county for a legal good word regarding their control . promote natural enemy such as parasitic wasps in the garden .
