Grevillea rhyolitica
Grevillea rhyolitica
Grevillea rhyolitica
Grevillea rhyolitica
Grevillea rhyolitica
Deua flame
The upper stem of the young plant was broken.
Sylvie S., 25/03/2018
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This plant carries a 24 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
Grevillea rhyolitica, or Deua Grevillea, is an evergreen Australian bush that is particularly floriferous, a little frost-sensitive but very well adapted to pot culture in cold regions. Its coral-red, nectar-rich, tubular flowers gathered in slightly trailing inflorescences, somewhat resemble those of Embothrium. They bloom from December to September, or even all year round in very mild climates, among leaves that are rather large for the genus, with an ovate shape and pointed tips. A very beautiful species to discover and cultivate on a sunny terrace for those who want an exotic touch.
Grevillea rhyolitica is a bush from the proteaceae family endemic to the Deua National Park, located in New South Wales, Australia. Accustomed to very silica-rich volcanic rocks, it is a pioneering species in its natural environment: it tolerates fairly poor but non-chalky dry soils, and requires full sun to flower. It grows quite rapidly, reaching maturity in 3-4 years, and on average reaches 2m (6 ft 7 in) in all directions. This bush has a spreading and open habit. The entire, elliptical leaves are light green with a matte finish. The flowering period lasts for a good part of the year, with the peak between April and June-July. The flowers are small and gathered in large trailing inflorescences that have a spider-like shape. The petal-less flowers are composed of a tubular, bright red style and long stamens.
Grevillea rhyolitica is not difficult to grow as long as the conditions are met. This bush requires little maintenance and tolerates light and regular pruning, which will keep it dense. It is best planted in coastal gardens protected from heavy frosts, in light, well-draining, and slightly acidic soil. Particularly suited to Mediterranean climates, it will look good in a hedge or as a standalone plant, on large slopes or at the back of dry garden beds, but always in an open and sunny position. In an exotic garden, it can be associated with proteas, Agave, Aloe, Canary Island viper's bugloss, Euphorbia mellifera, evergreen ceanothus, Melianthus major, palm trees, or even Leptospermum. Container cultivation, which is particularly suitable for this species, allows for control of the substrate composition and overwintering of the bush in a cold greenhouse or a very bright and lightly heated conservatory.
Grevillea rhyolitica in pictures
Plant habit
Flowering
Foliage
Botanical data
Grevillea
rhyolitica
Proteaceae
Deua flame
Australia
Planting and care
Grevillea rhyolitica is best planted in spring, after the last frosts. It prefers soil with an acidic to neutral pH, sandy, gritty, poor, and very well-drained. The presence of limestone in the soil causes yellowing of the foliage, chlorosis, which weakens the bush until it eventually dies. This disease can be corrected by regular application of chelated iron. In regions where the soil and subsoil are limestone, it is recommended to dig a large pit of 60 cm (23.6 in) in all directions and fill it with ericaceous soil and sand. Pot cultivation allows better control of the substrate and allows the plant to be stored frost-free in a borderline hardiness zone (up to -8°C (17.6 °F) for a well-established plant). In pots, use light, well-drained potting soil that remains moist. We recommend the following mix: 60% pine bark, 20% coarse river sand, 10% fine river sand, and 10% clay soil for its water retention capacity. The pH should be 7 or less.
Grevilleas are drought-resistant once well established: however, monitor watering during the first two years in summer and throughout the cultivation period in pots. In the ground, it benefits from a thick layer of mulch. Use wood chips or grass clippings. It is recommended to use a fertilizer very low in phosphorus, as it can decrease the plant's resistance to drought by destroying the dense root hairs that develop just below the soil surface. An N-P-K type fertilizer with an 18-2-10 ratio is well suited.
Insects and diseases:
Grevilleas can develop black leaf spots, caused by a rarely fatal fungus: a fungicidal treatment will resolve the issue.
Collar rot can also be observed, a deadly disease also caused by fungi that develop in moist and warm soil. Avoid burying the plant's collar, as it will improve aeration. Avoid watering too often in hot and dry weather, let the soil dry out between waterings.
Phytophthora (cinnamomi), a disease also caused by a fungus, affects many plants in dry areas. The parasite destroys the roots during excessively rainy winters. Prevention is crucial, as the disease is almost impossible to eradicate: ensure good drainage, remove water from the saucer placed under the pot, and remove dead or diseased parts.
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).
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.
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