Dichelachne crinita (Longhair Plume Grass): Complete Grass Growing Guide
Dichelachne crinita
Dichelachne crinita (Longhair Plume Grass) (Source: wikimedia)
1. Introduction & Taxonomy
Dichelachne crinita is one of Australia's and New Zealand's most elegant native grasses, earning its common name 'Longhair Plume Grass' from the spectacular, flowing awns that cascade from its slender panicles like a shimmering mane. Growing to 1.5 meters tall in open woodlands and grasslands, it creates mesmerizing waves of movement as even the slightest breeze sets its long-awned spikelets dancing in the light. This graceful grass is gaining well-deserved recognition in native-plant landscaping for its ethereal beauty and low-maintenance character. Dichelachne crinita is notable for reaching 1.5 m in height.
Dichelachne crinita is a tufted perennial grass growing 60-150 cm tall, forming loose to moderately dense clumps from a fibrous root system. The leaves are flat to inrolled, 2-5 mm wide, bright green to grey-green, and rough-textured on the upper surface. The flowering panicle is narrow and spike-like, 15-35 cm long, and is the plant's most dramatic feature: each spikelet bears a single floret with an awn 15-30 mm long, creating a flowing, hairy appearance that gleams golden in sunlight. The panicle is initially erect but becomes nodding and increasingly silky as the spikelets mature. The awns are geniculate (bent) and twisted at the base, catching the light to produce an iridescent, shimmering effect. Spikelets are 8-12 mm long, pale green to straw-colored at maturity.
Taxonomic Classification
Habitat and Distribution
Dichelachne crinita is native to eastern and southeastern Australia (from Queensland to Tasmania) and New Zealand. It inhabits open eucalypt woodlands, dry sclerophyll forests, grasslands, and coastal heathlands, typically on well-drained soils from sea level to about 1,200 meters.
Botanical Note: Poaceae (the grass family) is one of the largest and most ecologically important plant families, with over 12,000 species worldwide. True grasses have hollow, jointed culms (stems), narrow leaves with parallel veins and a distinctive ligule where the blade meets the sheath, and flowers reduced to spikelets arranged in panicles, racemes, or spikes. Ornamental grasses from this family are prized for their graceful movement, feathery inflorescences, and seasonal colour changes.
Native Range & Distribution Map
The map below shows the native range and notable cultivation regions for Dichelachne crinita.
2. Biology & Morphology
<\!-- SIZE_COMPARISON_SVG -->Growth Form & Architecture
Dichelachne crinita is a clumping true grass (Poaceae) with hollow, jointed culms, narrow leaves with parallel veins, and a distinctive ligule.
Species-Specific Morphology
Dichelachne crinita is a tufted perennial grass growing 60-150 cm tall, forming loose to moderately dense clumps from a fibrous root system. The leaves are flat to inrolled, 2-5 mm wide, bright green to grey-green, and rough-textured on the upper surface. The flowering panicle is narrow and spike-like, 15-35 cm long, and is the plant's most dramatic feature: each spikelet bears a single floret with an awn 15-30 mm long, creating a flowing, hairy appearance that gleams golden in sunlight. The panicle is initially erect but becomes nodding and increasingly silky as the spikelets mature. The awns are geniculate (bent) and twisted at the base, catching the light to produce an iridescent, shimmering effect. Spikelets are 8-12 mm long, pale green to straw-colored at maturity.
Inflorescence & Flower Structure
Grass flowers are highly reduced and arranged in spikelets, with wind pollination as the primary reproductive strategy.
Key Characteristics
- Height: 0.8-1.5 m
- Growth Habit: Clumping / Caespitose
- Growth Rate: Moderate under optimal conditions
- Life Cycle: Perennial
- Toxicity: Not toxic to humans, pets, or livestock. The long awns can occasionally cause mechanical irritation if they become lodged in animal fur or clothing.
- Conservation Status: Least Concern in both Australia and New Zealand. Widespread and common in suitable habitats, though some lowland populations have declined due to agricultural clearing and urbanization.
3. Reproduction & Propagation
<\!-- PROPAGATION_METHODS_SVG -->Primary propagation methods for Dichelachne crinita: Seed or vegetative division.
Propagating Dichelachne crinita
Dichelachne crinita is readily propagated by seed, which should be sown in autumn or spring on the surface of a well-drained native seed-raising mix. Cover lightly and keep moist; germination occurs in 14-28 days at 15-20C. Established clumps can also be divided in early spring by lifting the tussock, splitting it into sections with a sharp spade, and replanting in well-drained soil. Seed-raised plants typically flower in their second year.
Vegetative Propagation
Propagated by clump division in spring or early summer.
Propagation Tip: Division of established clumps in spring gives the fastest results.
4. Cultivation Requirements
<\!-- CULTIVATION_SVG -->Soil / Substrate
Well-draining, moderately fertile soil. A mix of garden loam, compost, and coarse sand.
Watering
Low to moderate. Adapted to well-drained soils and tolerates dry periods once established. Supplemental watering during extended droughts improves appearance but is not essential for survival.
Light Requirements
Full sun to partial shade. Most ornamental grasses perform best in full sun with at least 6 hours of direct light daily.
Temperature
- Optimal Growth: 18-30°C (65-86°F)
- Minimum Tolerance: -29°C (-20°F)
- USDA Hardiness: Zones 5-9
Fertilization
Apply a balanced slow-release fertilizer in spring. Most grasses are light feeders.
Common Cultivation Mistake: Over-watering and over-fertilizing promote weak, floppy growth. These plants prefer lean conditions.
Seasonal Care Calendar
Follow this season-by-season guide for optimal care timing throughout the year.
🌱 Spring (March–May)
The main growing season begins. New tufts can be planted or established clumps divided. Apply a light application of slow-release native-plant fertilizer if desired. Water newly planted specimens regularly.
☀️ Summer (June–August)
Flowering occurs in late spring to mid-summer. The shimmering, long-awned panicles are the highlight of the display. Water during extended dry spells but established plants are moderately drought-tolerant.
🍂 Fall (September–November)
Seeds ripen and disperse. The panicles dry to a beautiful straw color and remain ornamental. Leave them intact for winter interest. Reduce watering as temperatures cool.
❄️ Winter (December–February)
The plant is semi-evergreen in mild climates. Cut back old flowering stems to ground level in late winter to allow fresh spring growth. The clump may look somewhat tatty but will rejuvenate in spring.
5. Diseases & Pests
Below are the most common pests and diseases affecting Dichelachne crinita and how to manage them.
Grass rust (Puccinia spp.)
Orange-brown pustules on leaf blades and sheaths, most common in humid conditions during autumn. Usually cosmetic and the plant recovers naturally.
Crown rot (Fusarium spp.)
A fungal disease causing rotting at the base of the plant in poorly drained, heavy soils, leading to yellowing and eventual death of affected tufts.
Grass grub (Costelytra zealandica)
In New Zealand, the larvae of this beetle feed on grass roots, causing patches to yellow and die. Most damaging in late summer and autumn.
Red-legged earth mite (Halotydeus destructor)
A tiny mite that feeds on young leaves, causing a silvery stippling effect. Most active in cooler months in Australia.
IPM: (1) Choose the right species for your conditions. (2) Maintain good air circulation. (3) Cut back dead foliage in late winter. (4) Most ornamental grasses are remarkably pest-free when well-sited.
6. Indoor Growing Guide
Dichelachne crinita can be grown in containers and brought indoors during winter in cold climates.
Container Selection
Use containers with adequate drainage holes. Terra cotta pots provide good drainage and stability.
Indoor Light
Place in the brightest available location. Most grasses need at least 4-6 hours of direct or bright indirect light.
Indoor Success Key: Bright direct light is the single most important factor for growing grasses indoors.
7. Landscape Use & Design
Dichelachne crinita provides graceful movement, fine texture, and seasonal interest in the landscape.
Design Applications
- Native meadow and prairie-style plantings
- Ornamental grass border feature
- Dried flower arrangements
- Wildlife-friendly grassland restoration
- Low-maintenance slope stabilization
- Understory planting in open eucalypt woodland
Companion Planting
These species pair well with Dichelachne crinita in garden settings:
- Themeda triandra
- Poa labillardieri
- Dianella longifolia
- Lomandra longifolia
- Brachyscome multifida
- Chrysocephalum apiculatum
Design Principle: Ornamental grasses are at their most magical when backlit by low sun. Position where morning or evening light illuminates inflorescences from behind.
8. Cold Climate Strategies
Dichelachne crinita shows good cold tolerance and can be grown outdoors year-round in many temperate climates.
Hardiness Thresholds
- USDA Zones: 5-9
- Minimum Survival Temperature: -29°C (-20°F)
Overwintering Options
- Leave in Place (hardy species): Cut back dead foliage in late winter. Apply 5-10 cm of mulch around the crown.
- Container Culture: Move potted plants to a frost-free location for winter.
- Mulching: Apply thick straw or bark mulch over the crown after the first hard frost.
Winter Survival Rule: Most grass losses occur from wet cold. Ensure excellent drainage through winter.
Winter Care Tip: The plant is semi-evergreen in mild climates. Cut back old flowering stems to ground level in late winter to allow fresh spring growth. The clump may look somewhat tatty but will rejuvenate in spring.
9. Ethnobotany & Cultural Significance
Dichelachne crinita holds a significant place in Australian and New Zealand native grassland ecology and is increasingly recognized in the growing movement toward native-plant landscaping in both countries. Aboriginal Australians recognized this grass as an indicator of healthy grassland and woodland ecosystems. In modern landscape design, it has become a flagship species for the 'Australian meadow' aesthetic, championed by designers who advocate for native grasses as sustainable, low-water alternatives to traditional lawns and exotic ornamental grasses.
Conservation Note: Many grass, sedge, and rush species play critical ecological roles as habitat providers, soil stabilizers, and water filtration agents. By growing Dichelachne crinita, you contribute to maintaining awareness of these often-overlooked botanical workhorses.
Did You Know?
- The genus name 'Dichelachne' comes from the Greek 'dicha' (in two) and 'achne' (chaff), referring to the divided lemma tips at the base of the awn.
- The shimmering effect of the awns is caused by their twisted, geniculate structure, which refracts light as they move in the breeze.
- In New Zealand, it is one of the few native grasses that can compete successfully with introduced European pasture grasses in undisturbed habitats.
- The seeds are equipped with hygroscopic awns that coil and uncoil with humidity changes, actively drilling the seed into the soil surface for successful germination.
Frequently Asked Questions
What makes Dichelachne crinita special among ornamental grasses?
Its extraordinarily long awns (up to 3 cm each) create a shimmering, flowing effect in even the slightest breeze, making it one of the most kinetic and visually dynamic grasses for garden use.
Is it drought-tolerant?
Moderately so once established. It naturally grows in well-drained soils in open woodlands and can handle dry periods, but performs best with occasional supplemental watering during extended droughts.
Does it self-seed?
Yes, it can self-seed in the garden, but not usually aggressively. The seedlings are easily removed if unwanted. Self-sowing is actually desirable in naturalistic meadow plantings.
What soil type does it prefer?
It thrives in well-drained, sandy to loamy soils of low to moderate fertility. It does not perform well in heavy, waterlogged clay or highly enriched soils.
Summary & Key Takeaways
Dichelachne crinita, is a clumping member of the Poaceae reaching 1.5 m, native to New Guinea and Australasia. It shows good cold tolerance, making it suitable for temperate gardens.
Key Points to Remember:
- Propagation: Seed or clump division
- Light: Full sun for most species
- Substrate: Well-draining, moderately fertile
- Watering: Moderate — avoid overwatering
- Hardiness: USDA Zones 5-9, minimum -29°C (-20°F)