Hydrangea serrata Blue Deckle - Mountain Hydrangea
Hydrangea serrata Blue Deckle - Mountain Hydrangea
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Amelle B.
Hydrangea serrata Blue Deckle - Mountain Hydrangea
Amelle B. • 68 FR
Hydrangea serrata Blue Deckle - Mountain Hydrangea
Hydrangea serrata Blue Deckle
Mountain Hydrangea, Tea of Heaven
Magnificent, it completely matches my expectations. Planted along a wall in an open, partially shaded position where it will be trained, it is in the company of hostas, ferns, astilbe and heucheras.
Marie-Claude, 22/04/2025
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Description
Hydrangea serrata 'Blue Deckle' is a small shade bush offering flat flowers of a unique blue!
Awarded in spring 1992 at the Courson plant days, 'Blue Deckle' forms a small bush, 2m (7ft) high and wide. It bears deciduous leaves, which are tapered and sometimes brightly coloured in autumn in sunny locations. In June, it produces flowers in a unique light blue colour. Small tightly packed fertile flowers are grouped in the centre of the inflorescences, themselves surrounded peripherally by a crown of sterile flowers. These open on the current year's wood. The colour of the flowers varies depending on the nature of the soil and the presence or absence of aluminium sulphate.
Originating from Japanese mountains, Hydrangea serrata is hardy down to -15°C (5°F) and thrives in light, acid or neutral soil, that is neither heavy nor wet. Plant in partial shade or sun without the hot midday hours that could burn the flowering.
Plant Hydrangea serrata 'Blue Deckle' in a bed, on its own, or in a pot. Use it to compose spectacular flowering hedges. Pair it with other ericaceous soil plants like other hydrangea varieties, rhododendron, and azalea. Paulownia tomentosa is highly beneficial to hydrangeas as their turgid roots feed those of the bushes installed in the undergrowth.
Hydrangea serrata Blue Deckle - Mountain Hydrangea in pictures
Plant habit
Flowering
Foliage
Planting and care
Choose a shady to semi-shady exposure. When planting, use neutral to acidic soil. Use liquid fertiliser. Every three or four years, place well decomposed cow manure mixed with dead leaves at its base. Preferably water with non-limestone water. Be careful with slugs from February, as they attack young buds. Avoid planting your hydrangea under a birch, hazel, or ash due to the competition of roots that could hinder its growth.
Cut completely dry stems down to the base at the end of winter. For the rest, prune the oldest stems halfway up above the new, young shoots.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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