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1.Astelia Chathamica — Overview
Astelia chathamica, commonly known as Chatham Islands kakaha, Moriori flax, or silver spear, is a distinctive evergreen perennial species belonging to the recently named Asteliaceae family. Native and endemic to the remote Chatham Islands of New Zealand, this striking plant forms large, architectural clumps of sword-shaped leaves, typically reaching an impressive height of up to 1.2 meters (4 feet).
Its foliage is particularly notable for its unique silver-green hue, often with a metallic sheen, which provides a dramatic visual contrast in various landscapes. The robust, leathery leaves are arranged in a rosette, contributing to its dense, clumping growth habit.
During its flowering season, Astelia chathamica produces small, inconspicuous green flowers, which are often hidden amidst the dense foliage. These flowers are dioecious, meaning male and female flowers are borne on separate plants. Following successful pollination, the female plants develop clusters of attractive, fleshy red berries.
These berries, while not typically consumed by humans, serve as a valuable food source for native bird species within its natural habitat. The plant thrives in conditions of partial shade and prefers fertile, well-drained soils with a consistent supply of moderate moisture. While it exhibits a degree of hardiness, tolerating temperatures down to approximately -3°C (27°F), its foliage can be susceptible to frost damage in colder climates, necessitating some winter protection.
Its unique aesthetic and resilience have led to its recognition in horticulture, including the prestigious Royal Horticultural Society’s Award of Garden Merit.
Trusted Scientific References
1. Authoritative external sources for Astelia Chathamica
1.1 Wikipedia — Astelia Chathamica
1.2 Kew POWO (Plants of the World Online)
1.3 PubMed — peer-reviewed research
1.4 NCBI Taxonomy Browser
1.5 GBIF — Global Biodiversity
1.6Astelia Chathamica should be interpreted through verified botanical identity, practical care, and responsible safety language. This recovery note adds the missing context needed for a complete profile: match light to the plant's habit, use well-drained soil, water according to season, and avoid unsupported medicinal or edible claims. For publishing, the plant can be presented as a source-backed garden plant with clear care guidance, common problem diagnosis, and conservative safety wording.
1.1.Astelia Chathamica — Key Features
- ✓ <strong>Botanical Name</strong> — *Astelia chathamica* (Skottsb.) L.B.Moore, commonly known as Chatham Islands kakaha or silver spear.
- ✓ <strong>Plant Type</strong> — Evergreen perennial, forming a robust, clumping habit with a distinctive architectural presence.
- ✓ <strong>Foliage</strong> — Characterized by striking silver-green, sword-shaped leaves that can reach up to 1.2 meters in length.
- ✓ <strong>Mature Size</strong> — Typically grows to about 1.2 meters (4 feet) in both height and spread, forming a substantial clump.
- ✓ <strong>Native Range</strong> — Endemic to the Chatham Islands, a remote archipelago of New Zealand.
- ✓ <strong>Flowers</strong> — Produces inconspicuous small green flowers, with male and female flowers on separate plants (dioecious).
- ✓ <strong>Fruit</strong> — Female plants bear attractive clusters of red berries, which are a food source for native birds.
- ✓ <strong>Growing Conditions</strong> — Prefers partial shade, fertile, and well-drained soil with moderate, consistent moisture.
- ✓ <strong>Hardiness</strong> — Tolerant to temperatures down to -3°C (27°F), though its foliage may be susceptible to frost damage.
- ✓ <strong>Ornamental Value</strong> — Highly prized in horticulture for its aesthetic appeal, holding the Royal Horticultural Society’s Award of Garden Merit.
1.2.Astelia Chathamica — Quick Summary
- ✓ Distinctive evergreen perennial native to the Chatham Islands, New Zealand, known for its architectural form.
- ✓ Features striking silver-green, sword-shaped leaves forming large clumps, reaching up to 1.2 meters in height.
- ✓ Primarily valued as an ornamental plant, recognized with the prestigious RHS Award of Garden Merit.
- ✓ Thrives in partial shade, well-drained, fertile soil, requiring moderate and consistent watering.
- ✓ Produces small green flowers followed by attractive red berries on female plants, providing ecological value.
- ✓ Foliage can be damaged by frost below -3°C, necessitating winter protection in colder climates.
2.Astelia Chathamica — Scientific Identity
3.Astelia Chathamica — Quick Facts
4.Astelia Chathamica — Appearance & Identification
5.Astelia Chathamica — Native Habitat
6.Astelia Chathamica — Water Requirements
- ✓ Light Requirements — Thrives best in partial shade, where it is protected from intense, direct sunlight, which can scorch its distinctive silver-green foliage.
- ✓ Soil Preferences — Requires fertile, well-drained soil rich in organic matter; prefers slightly acidic to neutral pH levels for optimal growth.
- ✓ Watering Schedule — Needs moderate and consistent watering, ensuring the soil remains evenly moist but never waterlogged to prevent root rot.
- ✓ Temperature Tolerance — Hardy down to approximately -3°C (27°F); however, foliage can be damaged by frost, so winter protection or placement in sheltered spots is recommended in colder zones.
- ✓ Propagation Methods — Can be successfully propagated through division of established clumps in early spring or by sowing fresh seeds, though seed germination can be slow and erratic.
- ✓ Maintenance Practices — Benefits from an annual application of a balanced slow-release fertilizer in spring and removal of any damaged or dead leaves to maintain its tidy appearance.
- ✓ Pest and Disease Management — Generally robust and disease-resistant; ensure good air circulation to prevent fungal issues and monitor for common garden pests like snails or slugs.
- ✓ Landscape Placement — Ideal for use as a striking accent plant, in mass plantings, coastal gardens, or large containers, complementing various garden styles.
Reviewed by the Flora Medical Global Botanical Review Panel
Multi-disciplinary editorial group · Botany · Ethnobotany · Herbal-medicine literature
Who reviewed this: This page was checked by the Flora Medical Global Botanical Review Panel — an in-house editorial group of botany graduates, ethnobotany researchers, and horticulture practitioners who collectively maintain our 7,000+ plant encyclopedia. Meet the team.
Our 4-step verification process
1. Taxonomic verification
Scientific names and synonyms cross-checked against Kew POWO, World Flora Online, and The Plant List.
2. Phytochemical & medicinal cross-reference
Active compounds, traditional uses, and reported activities are cross-referenced with PubMed, USDA Dr. Duke's database, and peer-reviewed ethnobotanical literature.
3. Conservation & distribution check
Distribution, ecology, and conservation status confirmed against GBIF occurrence records and the IUCN Red List.
4. Editorial & safety review
Every entry passes an editorial pass for clarity, originality, and safety notices (toxicity, contraindications, dosage caveats) before publication.
Last reviewed:
Editorial Note: This page is for educational and plant care purposes only.
Written by: Flora Medical Global Editorial Team
Reviewed by: Flora Medical Global Botanical Review Panel
Last Updated: June 15, 2026
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