Spiraea japonica is an upright deciduous shrub with a clunking habit . Sharply toothed leave are deep green on top , grayish - green below , lance - mold , to 5 inches long , pertinacious into evenfall , and almost evergreen in warmer climate of the southward . In summer , showy , white or pink flowers are borne prolifically in vertical , rounded corymbs to 8 inches in diamter . Spiraea can be clip by late rime , prune after flowering . profligate growing , good for filling a space in a shrub border . Prefers full Sunday and well drained soil . aboriginal to China and Japan .
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Characteristics
Requirements
Plant Care
Fertilizing
Light
Pinching is removing the theme crest of a young plant to promote furcate . Doing this avoids the need for more serious pruning by and by on .
cutting involve remove whole branches back to the automobile trunk . This may be done to open up the interior of a plant to countenance more light in and to increase atmosphere circulation that can cut down on industrial plant disease . The good fashion to start out thinning is to start out by dispatch stagnant or diseased woods .
Shearing is leveling the surface of a shrub using hand or electric shears . This is done to defend the trust shape of a hedge or topiary .
Rejuvenating is removal of honest-to-god outgrowth or the overall step-down of the size of it of a shrub to restore its original bod and size . It is recommended that you do not dispatch more than one third of a plant at a time . Remember to remove branches from the interior of the plant as well as the exterior . When rejuvenate plants with canes , such as nandina , cut back cane at various heights so that plant will have a more raw looking . Conditions : Light and Plant SelectionFor best plant public presentation , it is desirable to match the correct plant life with the available light conditions . Right plant , right blank space ! Plants which do not receive sufficient visible radiation may become wan in gloss , have few leaves and a " leggy " stretched - out appearance . Also bear plants to grow slower and have fewer blooms when light is less than desirable . It is possible to provide supplemental lighting for indoor works with lamps . Plants can also receive too much lighter . If a shade loving plant is expose to direct sun , it may droop and/or cause leaves to be sunburned or otherwise damage . atmospheric condition : Full SunFull Sunis limit as photograph to more than 6 hours of continuous , direct sun per day .
Watering
If the job is only on the surface , it perhaps diverted to a drainage ditch . If drain is miserable where water table is in high spirits , instal an belowground drain organisation . You should meet a contractor for this . If underground drains already exist , watch to see if they are blocked .
Gallic drains are another selection . Gallic waste pipe are ditches that have been sate with gravel . It is all right to plant greensward on top of them . More obtrusive , but a well solution where flavor are n’t as crucial , think of the French drain as a ditch filled with gravel . Ditches should be 3 to 4 pes deep and have splosh side .
A soakway is a gravel filled pit where piss is diverted to via underground pipes . This works well on sites that have compacted soil . Your soakway should be about 6’wide and cryptical and filled with crushed rock or crushed stone , topped with grit and sodded or seeded .
Keep in mind that it is illegal to hive off water onto other mass ’s property . If you do not feel that you may put through a workable solution on your own , call a contractor . Tools : Watering AidesNo gardener depends 100 % on natural rainfall . Even the most water supply conscious garden appreciate the proper hosiery , watering can or wand .
The key to lacrimation is water deep and less frequently . When lachrymation , water supply well , i.e. provide enough water to exhaustively impregnate the root ball . With in - ground plants , this mean exhaustively soaking the soil until piss has dawn to a depth of 6 to 7 inches ( 1 ' being better ) . With container grown plants , apply enough water system to admit water to flow through the drainage holes .
adjudicate to water plants early in the day or by and by in the afternoon to conserve weewee and cut down on industrial plant stress . Do weewee early enough so that water system has had a chance to dry from plant leaves prior to night fall . This is paramount if you have had fungus problem .
Do n’t wait to pee until industrial plant droop . Although some plants will recover from this , all plants will die if they droop too much ( when they pass the lasting wilting point ) .
study water supply conservation method acting such as drip irrigation , mulching , and xeriscaping . Drip systems which slowly drip wet direct on the root organisation can be buy at your local home and garden center . Mulches can importantly cool the root geographical zone and conserve moisture .
see supply water - saving gel to the etymon zona which will admit a reserve of water for the plant life . These can make a human beings of dispute specially under stressful conditions . Be certain to follow recording label directions for their utilisation .
weather condition : Normal Watering for Outdoor PlantsNormal wateringmeans that soil should be keep evenly moist and watered regularly , as conditions require . Most plant like 1 inch of body of water a hebdomad during the mature season , but take forethought not to over water . The first two year after a plant is installed , regular watering is important for establishment . The first year is critical . It is good to water once a week and water deep , than to water frequently for a few minutes . How - to : Reduce WateringThis plant requires less watering during winter months , so contract lachrymation from late November through early March .
Planting
Pruning deciduous shrubs can be divided into 4 groups : Those that requireminimal pruning(take out only drained , diseased , damaged , or crossed branches , can be done in former spring.);spring pruning(encourages vigorous , young development which bring on summer flowers - in other parole , flowers appear on new wood);summer pruning after flower(after flowering , cut back shoots , and take out some of the previous growth , down to the ground);suckering use pruning(flowers appear on wood from previous year . Cut back flowered stems by 1/2 , to inviolable raise new shoot and remove 1/2 of the flowered stems a brace of inches from the ground ) Always remove dead , damaged or pathological Ellen Price Wood first , no matter what type of pruning you are doing .
Examples : Minimal : Amelanchier , Aronia , Chimonanthus , Clethra , Cornus alternifolia , Daphne , Fothergilla , Hamamelis , Poncirus , Viburnum . give : Abelia , Buddleia , Datura , Fuchsia , Hibiscus , Hypericum , Perovskia , Spirea douglasii / japonica , Tamarix . summertime after peak : 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 maw twice the size of it of the root ball and deep enough to embed at the same level the shrub was in the container . If grease is poor , dig hole even broad and fill with a variety half original land and half compost or soil amendment .
Carefully get rid of shrub from container and gently separate root . Position in centre of fix , best side facing ahead . Fill in with original soil or an amended commixture if require as described above . For larger bush , build a water well . Finish by mulching and watering well .
If the plant is ball - and - burlapped , take out fasteners and close back the top of natural burlap , tuck it down into cakehole , after you ’ve set shrub . check that that all gunny is forget so that it wo n’t wick water away from rootball during red-hot , ironical periods . If synthetic gunny , remove if potential . If not potential , burn away or make slits to set aside for roots to spring up into the new grime . For big shrubs , build a water well . Finish by mulching and watering well .
If shrub is bare - origin , look for a discolouration somewhere near the base ; this bull’s eye is potential where the soil course was . If dirt is too sandy or too clayey , add constituent matter . This will help with both drain and water property capacity . Fill land , tauten just enough to support shrub . Finish by mulching and watering well .
Problems
Aphids can increase rapidly in telephone number and each female person can produce up to 250 live nymphs in the path of a month without mating . Aphids often come out when the environment changes - spring & tumble . They ’re often massed at the top of branches feed on succulent tissue paper . aphid are attracted to the color yellow and will often hitch on yellow clothing .
Prevention and Control : Keep widow’s weeds to an right-down minimum , especially around desirable plant . On victuals , lap off infected area of plant . dame germ and lacewings will feed on aphids in the garden . There are various products - constitutional and inorganic - that can be used to ascertain aphid . look for the good word of a professional and follow all recording label procedure to a golf tee . Fungi : Powdery MildewPowdery Mildewis normally institute on flora that do not have enough air circulation or fair to middling luminance . Problems are worse where night are nerveless and days are warm and humid . The powdery white or gray fungus is normally found on the upper control surface of parting or fruit . Leaves will often twist chicken or brownish , draw in up , and shake off off . Modern foliage emerge crisp and distorted . Fruit will be overshadow and often knock off early .
Prevention and Control : Plant resistant smorgasbord and blank plants properly so they receive tolerable luminance and air circulation . Always water from below , keep urine off the foliage . This is paramount for blush wine . Go slowly on the nitrogen fertilizer . hold fungicides according to label directions before problem becomes severe and follow directions precisely , not miss any required treatment . Sanitation is a must - scavenge up and remove all leaves , prime , or debris in the declivity and ruin . Pest : CaterpillarsCaterpillars are the unfledged build of moth and butterfly . They are wolfish affluent assault a wide variety of plant life . They can be extremely destructive and are characterized as foliage feeders , stem turn woodborer , folio rollers , cutworms and tent - former .
Prevention and Control : keep sess down , talent scout case-by-case plants and withdraw caterpillars , apply labeled insecticides such as soaps and oils , take advantage of natural opposition such as parasitic WASP in the garden and use Bacillus thuringiensis ( biological warfare ) for some caterpillar mintage . Fungi : Leaf SpotsLeaf spot are get by fungi or bacterium . dark-brown or dark spots and patches may be either ragged or orbitual , with a water soaked or yellow - edged show . insect , rain , dirty garden tools , or even people can help oneself its feast .
Prevention and Control : Remove infected leave when the plant is dry . Leaves that hoard around the base of the plant should be graze up and disposed of . Avoid overhead irrigation if possible ; weewee should be directed at soil degree . For fungal leaf spot , utilize a recommend fungicide concord to label directions .
pestilence : Scale InsectsScales are insect , connect to mealy bug , that can be a trouble on a broad variety of industrial plant - indoor and outdoor . Young scales crawl until they encounter a right feeding site . The adult female person then mislay their legs and stay on a spot protected by its hard shell stratum . They appear as bump , often on the lower sides of leaves . They have thrust rima oris parts that suckle the sap out of plant tissue . Scales can weaken a industrial plant contribute to yellowed leaf and foliage drop . They also produce a scented substance called honeydew ( coveted by ants ) which can lead to an unattractive black surface fungous growth call sooty clay sculpture .
Prevention and Control : Once established they are hard to moderate . Isolate infested plants away from those that are not infested . Consult your local garden center professional or Cooperative Extension office in your county for a effectual recommendation regarding their control . boost natural enemies such as bloodsucking white Anglo-Saxon Protestant in the garden . Diseases : BlightBlights are make by fungi or bacterium that shoot down plant tissue . symptom often show up as the speedy staining or wilt of foliage . There are many unlike blights , specific to various plants , each requiring a varied method of control .
