Hydrangea serrata 'Blue Billow' Mountain hydrangea (Hydrangea serrata) hy-DRAIN-jah ser-RAY-tah 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.

Overview

Height 3 ft. to 6 ft. Spread 3 ft. to 6 ft. Growth Habit Clumps Growth Pace Moderate Grower Light Full Sun to Part Shade Moisture Medium to Wet Maintenance Low Characteristics Showy Flowers, Showy Seed Heads Bloom Time Fall, Summer Flower Color Blue, Pink Uses Beds and Borders, Container, Cut Flower, Dried Flower Style Cottage Garden, Woodland Garden Seasonal Interest Summer Interest Tolerance Frost Tolerant Type Shrubs