Alphabetical Plant Listing

Hydrangea serrata 'Diadem'

Mountain Hydrangea 'Diadem', Diadem Mountain Hydrangea


Flowering before any other hydrangea, Hydrangea serrata 'Diadem' is a compact, spreading, deciduous shrub laden with delicate lacecap flowers, up to 6 in. across (15 cm), in early summer. The flower heads are composed of large, showy sterile sepals radiating around a central cluster of tiny fertile florets. The florets are pale pink or light blue, depending on the soil pH. The profuse blossoms are beautifully framed by the foliage of narrowly-ovate, pointed, yellow-green leaves. 'Diadem' is an outstanding landscape shrub that is ideal for small gardens.

  • Winner of the prestigious Award of Garden Merit of the Royal Horticultural Society
  • This deciduous shrub enjoys a round, bushy habit, typically growing up to 3 ft. tall and wide (90 cm)
  • A full sun or part shade lover, it is best grown in rich, medium moisture, well-drained soils. Tolerant of sun if the soil remains moist.
  • No serious pest or disease issues. Watch for aphids, capsid bug, hydrangea scale and vine weevil.
  • Perfect from foundation plantings to container plantings. Massed in a sheltered location or as an accent plant.
  • To change the color of your Hydrangea, add aluminum sulfate to the soil to make the flowers bluer or add lime to the soil to make them pinker. Treatment should occur ahead of time (late fall or early spring)
  • This beautiful deciduous shrub should be pruned after flowering by cutting back the stems to a pair of healthy buds. Prune out weak or winter-damaged stems in early spring.

Not sure which Hydrangeas to pick?
Compare All Hydrangeas

Buy Hydrangea serrata 'Diadem'

Requirements

Hardiness 6 – 9
Heat Zones 5 – 9
Climate Zones 3, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hydrangeas
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Height 2' – 3' (60cm – 90cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 48" (120cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Plant of Merit, Showy
Garden Uses Beds and Borders, Patio and Containers, Small Gardens, Wall-Side Borders
Garden Styles City and Courtyard, Coastal Garden, Informal and Cottage, Traditional Garden

Buy Plants

Great Plant Combination Ideas with Hydrangeas

Guides with Hydrangeas


Fotoflor

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 6 – 9
Heat Zones 5 – 9
Climate Zones 3, 3B, 4, 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, H1
Plant Type Shrubs
Plant Family Hydrangeas
Exposure Full Sun, Partial Sun
Season of Interest Summer (Early,Mid,Late)
Height 2' – 3' (60cm – 90cm)
Spread 2' – 3' (60cm – 90cm)
Spacing 48" (120cm)
Water Needs Average
Maintenance Low
Soil Type Clay, Loam, Sand
Soil pH Acid, Neutral
Soil Drainage Moist but Well-Drained, Well-Drained
Characteristics Cut Flowers, Plant of Merit, Showy
Garden Uses Beds and Borders, Patio and Containers, Small Gardens, Wall-Side Borders
Garden Styles City and Courtyard, Coastal Garden, Informal and Cottage, Traditional Garden

Great Plant Combination Ideas with Hydrangeas

Guides with Hydrangeas

Plant Calculator

How many Hydrangea serrata 'Diadem' do I need for my garden?

%
ft
ft

Your Shopping List

Plant Quantity
Hydrangea serrata 'Diadem'

Find your Hardiness Zone

Find your Climate Zone

Find your Heat Zone

Join Gardenia.net

Create a membership account to save your garden designs and to view them on any device.

Becoming a contributing member of Gardenia is easy and can be done in just a few minutes. If you provide us with your name, email address and the payment of a modest $25 annual membership fee, you will become a full member, enabling you to design and save up to 25 of your garden design ideas.

Join now and start creating your dream garden!

Create a New Collection

Optional. For your reference.


Move Selected Plants to a Different Collection


Delete Collection

This field is required.