There are 23 species of the recurrent bush hydrangeas , including deciduous and evergreen varieties . The hydrangea can be a bush , vine or even a small Sir Herbert Beerbohm Tree , all with profuse heads of huge , round summertime flowers of white , pink , lilac , purple and blue , all in varying shades . Most hydrangea grow from 3 to 5 feet marvelous , but some can reach stature of 25 feet . While the hydrangea is relatively pest free , job can grow without proper tutelage and maintenance .

Hydrangea Disease Problems

Powdery mildew can cause problems for bigleaf hydrangea that are planted in shaded high humidness surface area . It seldom kills the plant life , but make purple splotches on the leaves , and spread over them in a idle grey pulverization . If the hydrangea looks wilted and does not gain vigor up when water , the cause is usually Armillaria root rot . Oakleaf hydrangeas are specially susceptible , specially those planted in poorly - drained soil . Fungal leaf spot can also attack hydrangeas , usually in the late summer and other fall . folio smirch can assail all specie of hydrangea , specially those planted in the full sun . A purple halo will appear on the leaf on the fungal infested works , surrounding a dark-brown gray wound . Although not fatal to the plant life , it will take away from its stunner . The smooth hydrangea is also susceptible to disease . rusting show as orange billet on the back of leaf . When rubbed , spore of fungus will be released in an orangish junk . Rust normally affects hydrangea in the fall .

Hydrangea Insect Problems

Aphids , Japanese beetle and mites can all attack the raw increase of hydrangea , although seldom to insect pest infestations become life-threatening enough to guarantee the economic consumption of an insect powder . While most species of hydrangea are not gravel by the Japanese beetle , it will fertilize on the oakleaf hydrangea . pismire crawling on the hydrangea usually mean an aphid problem . Aphids excrete sticky honeydew that the ant feed on . As the new plant growth matures over the summertime , the leaves become baffling and the little green insect trouble incline to melt . web between the raw leaf of the hydrangea are the other indication of wanderer mites . The lilliputian mites ca n’t be seen by the au naturel eye , but they can cause big problems , distorting emergence of the hydrangea . verify the hydrangea gets plenty of water during hot , dry atmospheric condition to keep mites from becoming a problem .

Hydrangea Problems caused by Climate and Soil

overly high pH in the soil can cause atomic number 26 chlorosis in raw leaf maturation of the bigleaf hydrangea . Lowering grease pH with applications of atomic number 13 sulfate or constitutive fabric will discipline the problem by allowing iron to become available in the dirt . Too much tone can prevent some hydrangeas from bloom . A reliable bloomer may on the spur of the moment be a blossom letdown if a young social organisation , or even nearby tree growth order the hydrangea in the shade . The plant can easily be actuate to a sunnier spot . If the temperature suddenly cut down after the hydrangea has bud in the spring , or before the plant has gone dormant in the fall , the cold temperature may affect the hydrangeas ' ability to blossom .

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