Grevillea rosmarinifolia Rosa Jenkinsii
Grevillea rosmarinifolia Rosa Jenkinsii
Grevillea rosmarinifolia Rosa Jenkinsii
Grevillea rosmarinifolia Rosa Jenkinsii
Rosemary Grevillea, Spider Flower
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Description
Grevillea rosmarinifolia 'Rosa Jenkinsii' is a compact variety of grevillea with rosemary-like leaves, featuring slightly trailing branches covered in very ornamental light green foliage throughout the year. It blooms early in spring, with short clusters of small bright pink spider-like flowers. This evergreen bush is both disease-resistant and tolerant of drought and cold, down to -10°C (14 °F) in well-drained soil. Excellent for coastal hedges, mixed shrub borders and large dry slopes, it also adapts well to container gardening.
Grevillea rosmarinifolia is a bush belonging to the protea family, native to the cooler regions of southeastern Australia. Many Grevillea species are pioneers in their natural environment: they tolerate fairly poor dry soils but do not like limestone, and require full sun to flower. 'Rosa Jenkinsii' is a more modest cultivar, slightly less spiky than its parent, offering mainly springtime pink flowering. It grows rapidly, reaching its mature size in 3 or 4 years, with a rounded habit that averages about 1.3 metres (4 feet 4 inches) in all directions. It develops thin ascending branches, forming a dense and somewhat bushy mass. Its small narrow and pointed leaves do not exceed 1.5 to 3 cm (0.6 to 1.2 in) in length. They are smooth, hairy on the underside, and bright light green. The very decorative flower buds form from late autumn. The flowering "explodes" from March and continues until May, without interruption. It can also reoccur in September in mild climates, if the soil remains somewhat moist in summer. The bright pink petal-less flowers are composed of petal-shaped styles rolled upon themselves and long recurved stamens. They are grouped in short spider-like clusters. The root system of this plant is very dense near the surface, which results in adaptation to nutrient-poor soils and summer drought.
The Grevillea rosmarinifolia 'Rosa Jenkinsii' is fairly resistant to sea spray, requires little maintenance and no watering once established, and tolerates light pruning to maintain density. It will easily thrive in coastal gardens as well as deeper inland, in sheltered positions and preferably in light, well-draining, slightly acidic soil. It will blend well with evergreen ceanothus in dense hedges, flowering over a long period. It will also make a good impression when planted alone on large slopes or in the back of dry gardens, always in an open position, in full sun. In an exotic or Mediterranean garden, it can be combined with proteas, Agave, Caesalpinia gilliesii, Sesbania punicea, Aloe aristata, Leucophyllum frutescens, as well as Callistemon and Leptospermum. Container gardening allows both control of the substrate composition and overwintering the bush in a cold greenhouse or a very bright and minimally heated conservatory in cold regions.
Grevillea rosmarinifolia Rosa Jenkinsii in pictures
Plant habit
Flowering
Foliage
Botanical data
Grevillea
rosmarinifolia
Rosa Jenkinsii
Proteaceae
Rosemary Grevillea, Spider Flower
Cultivar or hybrid
Planting and care
Grevillea 'Rosa Jenkinsii' is best planted in spring, after the last frosts. It prefers soil with a pH ranging from acidic to neutral, sandy, loamy, 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 with regular iron supplements. In regions where the soil and subsoil are limestone, dig a large hole of 60 cm (23.6 in) in all directions, filled with ericaceous soil or compost and non-limestone sand. Growing in a pot allows better control of the substrate and protects the plant from frost in areas with borderline hardiness (down to -9/-10°C (15.8/14 °F) for a well-established plant).
Grevilleas are drought-resistant once well established: monitor watering during the first 2 summers but this will become optional or even unnecessary later on. In the ground, they appreciate a thick layer of mulch. Use wood chips or grass clippings. It is recommended to use a fertilizer very in low phosphorus as it decrease the bush's drought resistance by destroying the thick root hairs that develop just below the soil surface. A fertilizer with N-P-K proportions of 18-2-10 is well-suited.
Olant Grevillea species and varieties with low growth in pots. Use a lightweight, well-drained potting mix that remains moist. We recommend the following mixture: 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.
Insects and diseases:
Grevilleas can develop black leaf spots, caused by a rarely fatal fungus: it can be treated with a fungicidal treatment.
Collar rot, a fatal disease caused by fungi that develop in wet and warm soil, is also a risk. Avoid burying the plant's collar, which will allow for better air circulation. Avoid watering too often during hot and dry weather, let the soil dry out between two 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. The plant can suddenly wither in summer due to a lack of water caused by the destruction of some or all of its roots. Partial or complete death of the vegetation or branches can be observed in severe cases. Prevention is crucial, as the disease is almost impossible to eradicate: ensure that the soil drainage is perfect, remove the water from the saucer placed under the pot, and remove dead or diseased parts.
Pruning:
Grevilleas tolerate annual pruning well, during their growth period or just after flowering. Shorten the branches by one-third of their length. A regularly pruned bush will be more branched and more floriferous.
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.