Overview
Grevillea sericea, commonly known as the pink spider flower or silky grevillea, is a species endemic to New South Wales, Australia. This flowering shrub belongs to the Proteaceae family and showcases unique characteristics that make it a popular choice for native gardens.
Summary
Grevillea sericea is an evergreen shrub first described by James Edward Smith in 1794. It's part of the diverse Grevillea genus, which comprises about 360 species. Robert Brown later transferred it to the Grevillea genus in 1810, solidifying its classification within this important group of Australian native plants.
Key Features
Grevillea sericea typically grows 0.5-2 metres tall with a 1-metre spread. Its elliptic to lance-shaped leaves measure 25-120 mm long and 2-9 mm wide, varying by subspecies. The shrub's distinctive flowers cluster on one side of the flowering rachis, displaying colours ranging from pink to deep purplish pink, white, or reddish.
Natural Habitat
Grevillea sericea thrives in its native New South Wales environment. It's adapted to grow in sandy or rocky soils, often found in coastal areas and dry sclerophyll forests. The plant's resilience to various conditions, including drought and poor soil, reflects its evolution in the diverse Australian landscape.
Growing Guide
Cultivating Grevillea sericea in your garden is rewarding and straightforward. Here's a comprehensive guide to help you successfully grow and maintain this attractive native shrub.
Requirements
Grevillea sericea thrives in sunny or semi-shaded spots with well-drained soil. It prefers slightly acidic to alkaline soil (pH 6.4-7.5) and tolerates moderate frosts and dry conditions once established. While adaptable, it benefits from mulch around the roots and occasional watering during prolonged droughts. This hardy plant suits a wide range of climates, making it an excellent choice for diverse garden settings.
Planting Tips
Prepare the soil thoroughly to improve water retention. Use a slow-release, low-phosphorus fertiliser when planting to support establishment. Choose a location that receives ample sunlight or partial shade. Dig a hole twice the size of the root ball and place the plant at the same depth it was in its container. Backfill with soil, water well, and add a layer of mulch around the base, keeping it away from the stem.
Maintenance
Grevillea sericea requires minimal maintenance once established. Prune lightly after flowering to maintain shape and encourage bushiness. Water deeply during dry spells, but avoid overwatering. Apply a native plant fertiliser annually in spring. Monitor for pests and diseases, although this plant is generally resistant. Remove any weeds competing for nutrients and water. Refresh mulch annually to conserve moisture and suppress weed growth.
Uses & Benefits
Grevillea sericea offers numerous uses and benefits for Australian gardens. Its versatile nature and attractive features make it a valuable addition to various landscape designs.
Garden Design
Grevillea sericea's versatility shines in garden design. Use it as a mid-story feature shrub, popping out over lower-growing plants. It responds well to tip pruning, allowing you to shape it into a dense low screen. This adaptability makes it suitable for different garden layouts, from formal to naturalistic designs.
Wildlife Benefits
The shrub serves as an excellent wildlife habitat. Its dense, prickly foliage provides shelter and protection for small birds. The nectar-rich flowers attract native pollinators, including honey bees and honeyeaters. By planting Grevillea sericea, you're creating a thriving ecosystem in your garden, supporting local biodiversity.
Special Features
Grevillea sericea boasts several special features. Its attractive flowers and dense foliage make it an ideal ornamental plant. The prickly leaves form an effective barrier, making it perfect for hedges or screens. Its drought tolerance and ability to thrive in poor soils make it a low-maintenance option for challenging garden areas.
Problems & Solutions
Grevillea sericea, while generally hardy, can face certain challenges in cultivation. Understanding these issues and their solutions ensures successful growth and maintenance of this attractive native shrub.
Common Issues
Grevillea sericea may experience skin irritation when handled, yellowing foliage in alkaline soils, and seed dormancy during propagation. Frost damage can occur in extreme cold snaps, despite the plant's moderate frost tolerance. Poor drainage leading to root rot and chlorosis from nutrient deficiencies are also potential problems.
Care Tips
Wear protective clothing when handling Grevillea sericea to avoid skin irritation. Ensure well-drained, slightly acidic soil to prevent yellowing foliage. Apply iron sulfate or sulfur to correct alkaline soil issues. For seed propagation, scarify seeds or use fire-related cues to break dormancy. Plant in sheltered areas to protect from harsh frosts.
Seasonal Notes
In spring, monitor for new growth and apply low-phosphorus fertiliser. Summer requires occasional deep watering during dry spells. Autumn is ideal for light pruning after flowering. In winter, protect from severe frosts by covering with frost cloth if necessary. Year-round, maintain good air circulation to prevent fungal issues.
Additional Information
Grevillea sericea offers diverse varieties and is available through various sources. Here's additional information to enhance your knowledge and guide your purchase decisions.
Varieties
Grevillea sericea has two recognized subspecies:
- subsp. sericea: Features leaves typically under 30 mm long and pink or white flowers above the foliage. Leaves are egg-shaped to elliptic.
- subsp. riparia: Found along rivers in the lower Blue Mountains, with leaves up to 120 mm long and deep pink to purple flowers amongst linear leaves.
Where to Buy
You can purchase Grevillea sericea from:
- Local native plant nurseries specialising in Australian flora
- Online retailers focusing on native plants
- Botanical gardens' plant sales
- Community plant swaps or gardening clubs
- Specialist Proteaceae nurseries
Check for availability as it may vary seasonally.
- Australian Native Plants Society website
- Royal Botanic Gardens Sydney online resources
- Gardening Australia's native plant guides
- Local botanical gardens' educational materials
- Australian flora field guides and identification books
- State-specific native plant societies' publications