Hydrangea macrophylla ‘Amethyst’

mophead hydrangea

  • © Joy Creek Nursery

Outstanding Qualities

A choice summer-flowering deciduous shrub, Hydrangea macrophylla 'Amethyst', is unique for its charming mophead flowers that produce both single and double florets. In mid-summer, clusters of pale-pink to pale-purple flowers develop, each petal-like sepal touched toward the edge with mauve. Flowering will continue until early fall. The flower trusses are smaller and more delicate than other mopheads, but hold their color well giving a long season of interest. Early flowers will often have more single blooms and later flowers will have more double florets. Use in rhododendron and azalea plantings to add summer color. Shade-loving perennials such as hostas or ferns add wonderful lush surroundings to the summer blooms.

Quick Facts

Plant Type: shrub

Foliage Type: deciduous

Plant Height: 4 ft. 0 in. (1.22 meters)

Plant Width/Spread: 5 ft. 0 in. (1.52 meters)

Plant Height-Mature: 0 ft. 0 in. (0.00 meters)

Plant Width-Mature: 0 ft. 0 in. (0.00 meters)

Hardiness: USDA Zones 6 to 9

Flower Color: lavender

Sun/Light Exposure: light to open shade

Water Requirements: regular summer watering

Colors & Combos

Great Color Contrasts: orange, variegated, bronze

Great Color Partners: rose, purple, cream

Culture Notes
This hydrangea grows best in light to open shade. A location protected from hot sun will keep the foliage and flowers from prematurely fading or scorching. A rich moist to well-drained soil produces the best growth and flowering. Hydrangeas are not drought tolerant and will grow and flower more prolifically with regular summer watering. The typically acidic soils of the Pacific Northwest will cause the variable flowers to bloom with purple and blue tones. For pink flowers, add lime to raise the pH and sweeten the soil. Have a soil test done to determine the amount of lime. Changing the color can often take a few years to accomplish with more than one application of lime. Remove a few old twiggy branches to the ground yearly or prune lightly to improve the overall shape. Heavy pruning can ruin the flowering for the following year. Consult an experienced pruner or take local classes before attempting substantial pruning.