Hydrangea serrata Hydrangea serrata 'Blue Billow' Photo/Illustration: Courtesy of White Flower Farm
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Botanical Name: Hydrangea serrata hy-DRAIN-jah ser-RAY-tah Common Name: Mountain hydrangea Synonyms: Hydrangea macrophylla ssp. serrata Genus: Hydrangea
This species was formerly grouped with the Lacecap hydrangeas because of its flattened flowerheads that consist of central, small florets surrounded by showy, larger florets. It is similiar to H. macrophylla but is a more compact plant with smaller flowers and leaves. Noteworthy characteristics: Blue or pink lacy flowerheads. Care: Grow in moist, but well-drained soil, in sun to partial shade. Provide shelter from drying winds. Propagation: Sow seed in a cold frame in spring; take softwood cuttings in early summer, hardwood cuttings in winter. Problems: Gray mold, slugs, powdery mildew, rust, ringspot virus, leaf spots.