Hydrangea quercifolia Amethyst
Hydrangea quercifolia Amethyst
Hydrangea quercifolia Amethyst
Oakleaf Hydrangea
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Description
Hydrangea quercifolia 'Amethyst' is a vigorous variety of Oakleaf Hydrangea, appreciated for its large cream-white inflorescences and beautiful autumn colours. Its large panicles turn pink, then red and purple as they fade, creating a remarkable symphony of colour with the autumn foliage. It is a beautiful deciduous shrub, decorative for nine months out of twelve. Like all "oakleaf" hydrangeas, this hydrangea is undemanding in terms of soil and climate.
Hydrangea quercifolia 'Amethyst' is similar to 'Snow Queen', but the plant is slightly more vigorous and its inflorescences have more large decorative sterile florets. The species, Hydrangea quercifolia, from the hydrangea family, is mainly native to the southwest United States, particularly the Mississippi Valley. It can be found growing on cliffs, in moist woods, in ravines, and along riverbanks, from Georgia to Louisiana, through Florida. It is a large deciduous shrub, reaching a height of 4m in its natural habitat and spreading up to 3.50m in width through the production of shoots. It is characterised by large lobed leaves, which resemble oak leaves. It is appreciated for its superb autumn colours and its large upright white panicles composed of small frothy fertile flowers surrounded by larger fertile florets. In the garden, it is one of the easiest hydrangeas to grow: it is hardy beyond -20°C, tolerates some limestone in the soil, and can withstand heat and occasionally dry soil in summer if it is deep.
The 'Amethyst' cultivar was discovered in the United States by Dr. Michael Dirr near Cincinnati, Ohio. It has upright conical inflorescences that are 15cm long, with cream-white fertile florets that quickly turn wine red if the plant receives some sun. This colour is long-lasting on the plant or in fresh or dried bouquets. Flowering begins in June-July, depending on the climate, on old wood. The compact shrub reaches between 1.50m and 1.80m in all directions. The large, dark green, 12-14cm long leaves are deeply lobed with coarsely toothed edges. In late summer, they take on fantastic shades of red to violet before falling in October. The bark of this variety peels over time, revealing a new and shiny cinnamon-coloured wood, which is decorative in winter.
Hydrangea quercifolia 'Amethyst' likes slightly sunny exposures that will enhance its autumn colours. It can be used in shrub borders or an informal hedge. It can be associated with paniculate hydrangeas, as well as with guelder roses (Viburnum opulus) or wild barberries (Berberis sauvages).
Plant habit
Flowering
Foliage
Botanical data
Hydrangea
quercifolia
Amethyst
Hydrangeaceae
Oakleaf Hydrangea
Cultivar or hybrid
Planting and care
This 'Amethyst' oakleaf hydrangea requires a sunny exposure to enhance autumn colours, but it doesn't like excessively hot exposures: morning sun or shade from a large tree during the hottest hours are preferable, especially in very sunny and hot regions. It prefers humus-bearing, neutral to acidic soil, but tolerates limestone better than other hydrangeas after careful planting in a hole filled with a mixture of leaf compost and loam. Plant it in deeply worked soil. A good base fertiliser (horn or dehydrated blood) will promote the establishment of your plant and nourish it without risk of burning. If your soil tends to be very dry in summer, create a surface watering basin and mulch in summer. Once well established, this hydrangea can do without watering in summer, except in southern regions where it will appreciate weekly watering, or every two weeks depending on the weather. In late summer, it is best to leave the dry inflorescences, which will protect the terminal shoots of the branches in winter. You can cut all the dry flowers at the end of February or on the first warm days. Its spring vegetation is quite late.
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).
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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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.