Overview
Grevillea iaspicula, commonly known as the Wee Jasper Grevillea, is a rare and endangered shrub native to southern New South Wales, Australia. First collected in 1966, it wasn't botanically described until 1986 by D.J. McGillivray.
Summary
Grevillea iaspicula is one of Australia's rarest plants, with only about 100 mature individuals remaining in the wild. It's listed as endangered under Commonwealth legislation and critically endangered at the state level. Conservation efforts include replanting clones, fencing to protect from grazing, and weed control to mitigate threats like blackberry invasion and hybridization.
Key Features
Grevillea iaspicula is a small to medium shrub, typically growing 1.2-1.5 metres tall, but can reach 2.5 metres. It features distinctive red flowers and unique foliage, making it appealing to botanists and garden enthusiasts. The plant's resilience in harsh conditions underscores its significance for conservation efforts and horticultural research.
Natural Habitat
Grevillea iaspicula is found exclusively in a limited region of New South Wales, Australia. It thrives in rocky limestone outcrops and steep slopes, adapting to harsh environmental conditions. The plant's natural habitat is characterised by well-drained soils and exposure to full sun or partial shade, reflecting its resilience and specialised adaptation to its native ecosystem.
Growing Guide
Grevillea iaspicula, or Wee Jasper Spider Flower, is a rare and adaptable shrub that can thrive in various conditions. Follow these guidelines to successfully grow this endangered species in your garden.
Requirements
Grevillea iaspicula grows best in well-draining, stony soils and tolerates limestone. It reaches 1.2-1.5 metres in height and width, occasionally growing up to 4 metres. Plant in full sun to partial shade. Once established, it's drought-tolerant but benefits from regular watering during dry spells. This hardy shrub adapts well to Canberra's climate and surrounding areas.
Planting Tips
Prepare the planting site by ensuring excellent drainage. Choose a location with protection from strong winds. Dig a hole twice the size of the root ball and mix native plant fertiliser into the backfill soil. Plant at the same depth as it was in the container. Water thoroughly after planting and mulch around the base, keeping mulch away from the stem.
Maintenance
Prune lightly after flowering to maintain shape and encourage bushiness. Apply a slow-release, low-phosphorus fertiliser in spring. Monitor for pests and diseases, particularly root rot in poorly drained soils. Protect young plants from frost in colder regions. Remove weeds regularly to reduce competition for nutrients and water. Avoid overwatering, especially in winter, to prevent root problems.
Uses & Benefits
Grevillea iaspicula offers unique advantages for conservation efforts and garden aesthetics. This rare plant species provides ecological, ornamental, and wildlife benefits.
Garden Design
Grevillea iaspicula's stunning red flowers and distinctive foliage make it a standout feature in gardens. Its compact size, typically 1.2-1.5 metres tall, suits rock gardens and small spaces. Plant it as a focal point or in groups for a dramatic effect. Its drought tolerance and adaptability to rocky, well-drained soils make it ideal for low-maintenance landscapes.
Wildlife Benefits
This shrub attracts native nectar-feeding birds, enhancing biodiversity in your garden. Its tubular flowers provide a valuable food source for honeyeaters and other pollinators. By cultivating Grevillea iaspicula, you're supporting local wildlife and contributing to the conservation of this endangered species. It's an excellent choice for creating wildlife-friendly gardens.
Special Features
Grevillea iaspicula's rarity and critically endangered status make it a unique addition to any garden. Its ability to thrive in harsh conditions, including rocky limestone outcrops and steep slopes, showcases its resilience. The plant's conservation significance adds educational value, allowing you to raise awareness about endangered species and their protection while enjoying its ornamental qualities.
Problems & Solutions
Grevillea iaspicula faces several challenges in its survival and cultivation. Understanding these issues and implementing appropriate solutions is crucial for the conservation of this critically endangered species.
Common Issues
Grevillea iaspicula is vulnerable to fire, grazing, land clearing, and invasive species. As an obligate seeder, fires kill standing plants, forcing populations to regenerate from soil-stored seeds. Habitat fragmentation due to agriculture and grazing reduces population size and genetic diversity. Competition with weeds and invasive species further threatens its survival. Drought conditions limit reproductive output, impacting long-term viability.
Care Tips
Protect Grevillea iaspicula from fire by creating firebreaks and implementing controlled burning strategies. Fence off plants to prevent grazing damage. Remove competing weeds and invasive species regularly. Ensure well-draining soil and proper watering during dry spells. Apply low-phosphorus fertiliser sparingly to avoid nutrient imbalances. Monitor for pests and diseases, addressing issues promptly to maintain plant health.
Seasonal Notes
In spring, prune lightly after flowering to promote bushiness and remove dead wood. During summer, provide extra water during prolonged dry periods. In autumn, apply a layer of mulch to retain soil moisture and suppress weed growth. Winter is ideal for planting new specimens, allowing roots to establish before the growing season. Monitor for frost damage in colder regions and protect young plants if necessary.
Additional Information
Grevillea iaspicula, despite its rarity, has garnered interest from botanists and gardeners alike. Here's some additional information about this unique plant species.
Varieties
Grevillea iaspicula doesn't have any recognised varieties or cultivars due to its critically endangered status and limited wild population. The species exhibits some natural variation in leaf shape and flower colour intensity within its restricted range. Conservation efforts focus on preserving the genetic diversity of the existing wild plants rather than developing cultivated varieties.
Where to Buy
Grevillea iaspicula is rarely available for purchase due to its endangered status. Specialist native plant nurseries in Australia occasionally offer limited stock propagated from licensed sources. Check with local botanic gardens or conservation organisations for potential availability. Always ensure plants are sourced ethically and legally to support conservation efforts.
- Australian Native Plants Society (Australia)
- The Royal Botanic Gardens Sydney website
- NSW Department of Planning and Environment - Threatened Species Profile
- Australian Government - Species Profile and Threats Database
- Local botanic gardens with conservation programs