Hydrangea Hybriden - Hortensia

Variety overview

Ball-shaped flowers

Plate-shaped flowers

Specifications:

Origin:

Wild varieties Japan

Habit:

Broad, upright growing, hemispheric, flowering shrub, 1.5-2 m tall and wide, branches arching under the weight of the flowers, slow-growing.

Flowers:

Mop-headed or lacecap, large flowers, colours depending on variety and soil pH, blue, white, rose, July to August (September), pruning from mid-June to mid-July promotes bud formation.

Leaves:

Deciduous, succulent, ovate, medium green, no autumn colour.

Demands:

Sun to semi-shade, demands wind protection, moderately frost hardy depending on variety, root ball should not dry out, no waterlogging.

Soil:

Fresh to moist, deep, rich in humus, slightly acidic, nutritious substrates; tolerates alkaline habitats, this may have an effect on flower colour.

Note:

Only frozen or dense growing shoots should be pruned as flowers are developed on last season’s wood. The varieties are partly assigned
to H. macrophylla, partly to H. serrata.

Tip:

Soil pH is decisive for flower colour. Maintaining blue flowers demands free aluminium ions with a soil pH between 4.0 and .5; white and red hortensias keep their flowers independant of soil pH.

Hardiness:

H. macrophylla Zone 6b

Hardiness:

H. serrata Zone 7

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