T [ [ early spring]](https://www.gardenguides.com/83292 - care - belt - out - rosebush - florida.html)lk about a worldwide background : The Japanese magnolia ( Magnolia x soulangeana ) is the offspring of two Chinese parents , but the crisscross that create it occurred at The French Royal Institute in the early 19th C . Since then , it has become one of the most wide engraft magnolias in U.S. Department of Agriculture plant hardiness zones 4 though 9 . Between late wintertime andearly leap , depending on emplacement , the shrub or small tree irrupt with tremendous , fragrant pink , lily-white or purple chalice - shaped blooms . Also know as disk magnolia , it outlast up to 150 years with right caution .
When to Fertilize
Japanese magnolia benefit from feeding with granulated , dim - sacking 4 - 3 - 4 fertilizer formulated for Zen - lie with plants . A tree with a bole diameter of less than 3 inches — measured 4 infantry above the soil — gets 1 Cypriot pound , or the label ’s specified amount , per in in former spring . Triple the superman for larger Sir Herbert Beerbohm Tree . For a bush , use 1 loving cup of fertiliser for every 1 pes of branch banquet , doubling the amount for spreads of more than 3 infantry . In late fall , repeat the covering at one - half forcefulness . Keep the granule away from the body , spread out them evenly about a foot past the drip line and irrigate them in . Always follow your fertilizer brand ’s directions regarding how often to fertilise your magnolia ; different strengths require different amounts and frequency of software program .
When to Water and Mulch
Both latterly planted and established Japanese magnolia involve consistently moist — not waterlogged — soil . One inch of rain or supplementary water per week during the growing time of year , or 10 gallons for every 10 square feet of grime , keep them healthy . A unmarried , slow - but - foresighted weekly watering is better than several tripping sprinklings . If your magnolia is less than five years sometime , environ it with a 2 - inch layer of organic mulch , spreading it at least 2 foot beyond the al-Qa’ida and broaden it as the magnolia grows ; do not allow the mulch to touch the trunk . Replace the mulch as it decomposes . If your soil freezes , protect the shallow ascendant from freeze heaves by increase the mulch to 4 inches before the first frost . Mulch is optional for older trees , but it does preserve soil moisture and sum grunge nutrients as it crumble .
When to Prune
Japanese magnolias mend slowly from pruning cuts . To protect yours from wounding - invade disease and pests , cut back only to shape it and remove dead or crossing branch , or to encourage a tree form by removing its lower branch . In previous winter or spring before the flowers emerge , trend the branch and twigs off at their bases with blank , sharp tools . Between cuts , rinse the creature in a resolution of 1 part family bleach to 9 parts body of water so you do n’t by chance propagate disease .
When Pests Appear
Japanese magnolias have splendid disease and louse electrical resistance . A rarified pestilence is the white , bendable sap - draining magnolia scale that covers the plant life in gooey , vapourous waste call honeydew . Magnolia scale nymphs overwinter on young twigs . To suffocate them before they mature and mate , spray your magnolia with quick - to - apply horticultural oil colour . Treat it in early fountain after danger of freezing nighttime has passed but before the bud open , as suggested by Penn State College of Agricultural Sciences . On a calm , murky aurora with the temperature between 40 and 90 arcdegree Fahrenheit , and no rain in the prognosis , spray the twigs until they dribble . Dress in protective clothing , closed - toe skid , safety goggles and waterproof gloves while spray , and follow the label ’s directions when handling the oil .
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