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Rosemary Grevillea

Grevillea rosmarinifolia

$23.00 Sold out

1 Gallon | Hardiness Zones 8-10

This unusual shrub grows to 6 feet but is sometimes lower and semi-prostrate. The foliage resembles Rosemary but the curious flowers are red and cream and borne in late fall. This plant is native to Australia and has performed well in various gardens in the southern U.S. when given a well-drained soil and a sunny location.

Pickup currently unavailable at Aiken Nursery

PLANT DETAILS

Hardiness Zones: 8 - 10

Soil: Well-drained

Sun: Full Sun and Part Shade

Seasonal Behavior: Evergreen

Growth Rate: Moderate

Height at Maturity: 4 - 6 Feet

Spread at Maturity: 3 - 5 Feet

Foliage: The leaves are narrow, needle-like, and resemble those of rosemary, giving the plant its common name. The foliage is dark green, providing a year-round evergreen presence in the garden.

Flowers: Produces clusters of small, red or pink, spider-like flowers that bloom from late winter through spring. The flowers are rich in nectar, making them attractive to birds and other pollinators.

red with cream, dense racemes - fall to winter

Light Requirements: Prefers full sun to partial shade. For best flowering and overall growth, plant Grevillea rosmarinifolia in a location that receives at least 6 hours of direct sunlight daily. It can tolerate some shade, especially in hotter climates, but too much shade can reduce blooming.

Soil Requirements: Thrives in well-draining soil. This plant prefers slightly acidic to neutral soil with a pH range of 5.5-7.0. It can adapt to various soil types, including sandy and loamy soils. Avoid heavy clay soils unless they are well-draining, as poor drainage can lead to root rot. Incorporating sand or gravel can help improve drainage in heavier soils.

Watering: Requires low to moderate watering. Grevillea rosmarinifolia is drought-tolerant once established but will benefit from occasional deep watering during extended dry periods. Avoid overwatering, as the plant is sensitive to waterlogged conditions. Watering should be reduced in cooler months.

Temperature and Humidity: Hardy in USDA zones 8-10. Grevillea rosmarinifolia is tolerant of a wide range of temperatures and can withstand mild frost. It prefers dry to moderately humid climates. In areas with cold winters, protect the plant from prolonged frost and freezing temperatures.

Fertilization: Requires minimal fertilization. If necessary, use a low-phosphorus fertilizer, as Grevilleas are sensitive to phosphorus, which can harm the plant. A light application of a balanced, slow-release fertilizer in early spring can support growth and flowering. Avoid over-fertilizing, as this can lead to nutrient imbalances and poor health.

Pruning: Prune lightly after the flowering period to shape the plant and encourage bushier growth. Regular pruning helps maintain a compact form and can enhance the density of the foliage. Grevillea rosmarinifolia responds well to pruning, but avoid cutting back into old wood, as it may not regenerate.

Pests and Problems: Generally pest-resistant, but may occasionally be affected by aphids or spider mites. Ensure good air circulation around the plant to prevent fungal diseases, which can occur in overly humid or wet conditions. If pests are detected, treat with insecticidal soap or neem oil. Regular inspections and good garden hygiene can help maintain plant health.

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