Richards toetoe Care (Austroderia richardii)

Also known as: Early Pampas-grass
Richards toetoe

About Richards toetoe

Richards toetoe (Austroderia richardii) is a large, clump-forming ornamental grass native to river terraces and wet valleys of New Zealand’s South Island. It forms tall, graceful fountains of narrow, arching leaves topped with feathery cream plumes in late season. The plant has a strong, fibrous root system and tolerates wind and exposed sites, which makes it useful for larger gardens and naturalistic plantings. It is generally tough but needs space to show its full form and can look untidy if crowded or poorly placed. This species prefers sun, consistent moisture, and free-draining soil, which helps guide how to care for Richards toetoe in temperate climates.

Main Plant Requirements

Care Difficulty

Easy Care

Light Preference

Full Sun

Water Requirements

Moderate Water

Temperature Preference

Cold Hardy

Hardiness Zone

7–10

Soil Texture

Sandy, Loamy, Rocky

Soil pH

Slightly acidic (6.5–7.0), Neutral (7.0)

Soil Drainage

Well-drained

Fertilization

Minimal (feed rarely)

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How to Care for the Richards toetoe

This clump-forming grass prefers bright, open conditions similar to its native riverbeds and tussocklands.

  • Provide full sun for 6–8 hours daily; Richards toetoe flowers and stands more upright in open, unshaded sites.
  • Plant where it receives morning sun and, in hotter regions, light afternoon shade to reduce leaf scorch and drying winds.
  • In cooler or cloudy climates it tolerates light partial shade, but dense shade causes weak, floppy growth and fewer plumes.

This species prefers moist but well-drained soil, especially while establishing in the first 1–2 years.

  • In the ground, aim for soil that stays slightly moist; allow the top 3–5 cm to dry between deep soakings, guided by weather and soil type.
  • Increase watering during hot, dry spells, watching for rolled, drooping leaves as a sign that Austroderia richardii needs moisture.
  • Avoid waterlogged sites; yellowing leaves, a sour smell, or standing water around the roots indicate poor drainage and overwatering.

This hardy grass tolerates a wide temperature range and suits many temperate climates.

  • Optimal growth occurs around 60–75°F (16–24°C), especially during the main growing season in spring and early summer.
  • Established plants tolerate cold down to about 10–15°F (-12 to -9°C), with foliage damage possible but roots usually surviving in well-drained soil.
  • It handles summer heat up to about 90°F (32°C) if soil moisture is maintained; prolonged hotter, dry winds can dry leaf tips and reduce flowering.

This species tolerates a wide humidity range and rarely needs special humidity management.

This grass prefers free-draining mineral soils that do not stay waterlogged.

  • Use a sandy or gravelly loam with 20–30% coarse grit to keep pore spaces open and roots oxygenated.
  • Aim for slightly acidic to neutral pH, around 6.0–7.2, which supports nutrient availability without toxicity issues.
  • In heavy clay, create a raised mound and mix in sharp sand and fine gravel to improve drainage and reduce winter rot risk.
  • Avoid compacted, boggy, or peat-heavy mixes that hold prolonged moisture around the crown and lower stems.

This species can be grown in large outdoor containers if the pot is stable and drains quickly.

  • Choose a wide, heavy container to counterbalance tall, wind-catching flower plumes and reduce tipping risk.
  • Use a deep pot to allow the fibrous root system to anchor firmly and support full-sized clumps.
  • Raise the container on feet or spacers so drainage holes stay clear and excess water escapes after rain.

This tough grass usually needs minimal feeding, especially in fertile garden soil.

  • In poor or sandy soils, apply a light dressing of compost or a balanced slow-release fertilizer (around 10-10-10) once in spring to support growing Richards toetoe.
  • Use about half the manufacturer’s recommended rate to avoid overly lush, floppy foliage.
  • Do not feed in fall or winter, since the plant is slowing into dormancy.
  • Always water well after applying fertilizer to move nutrients into the root zone.

Pruning Austroderia richardii focuses on removing old material and keeping the clump tidy.

  • Best time is late winter to very early spring, before strong new growth starts.
  • Cut back dead or damaged leaves and spent flower stems at the base using sharp secateurs or shears.
  • Thin out congested older stems in the clump’s center to maintain good air flow and shape.
  • Avoid cutting into fresh green shoots, which provide energy for strong growth and flowering.

This tall tussock grass is usually grown in the ground, so care centers on occasional transplanting rather than frequent repotting.

  • Transplant in late winter or early spring when growth is just resuming and temperatures are mild.
  • Look for signs such as a congested clump, reduced vigor, or roots circling and emerging from container holes.
  • Lift the plant with as much root ball as possible, keep roots shaded and moist, and replant at the same soil depth.
  • Water thoroughly after transplanting and keep soil evenly moist for several weeks to reduce root stress and encourage re-establishment.

Austroderia richardii is commonly propagated by division or from seed in suitable conditions.

  • Divide mature clumps in late winter or early spring, lifting and splitting the root mass into firm, healthy sections.
  • Replant divisions promptly in well-drained soil, water in well, and keep evenly moist until new growth strengthens.
  • For seeds, sow fresh in trays or pots of free-draining mix, just covering them lightly.
  • Maintain bright light, consistent moisture, and cool to mild temperatures to support germination and early growth.

This species is generally cold hardy in temperate climates and often needs little special winter care once established.

  • In colder regions, apply a 5–8 cm mulch around the root zone in late fall to buffer temperature swings.
  • Leave most foliage in place over winter, trimming only obviously damaged leaves to reduce wind and frost exposure.
  • Container-grown plants in very cold areas can be moved to a sheltered, unheated but frost-free spot.

Care Tips

Wind hardening

If planting in a windy site, raise young plants in a sheltered spot first, then gradually expose them to stronger winds over 2–3 weeks to reduce leaf shredding and strengthen the clumps before final planting.

Clump renewal

Every 5–7 years, lift and divide congested clumps in late winter, replanting only the vigorous outer sections so the plant maintains strong flowering and a tidy form.

Seed head management

In regions where it may self-seed, remove most of the mature plumes before seeds disperse, leaving only a few for ornamental effect to limit unwanted spread without losing the plant’s look.

Slope stabilization

Use multiple plants spaced 80–120 cm apart on banks or slopes, aligning rows in a staggered pattern so the root masses interlock and help stabilize loose or eroding soil.

Firewise placement

In fire-prone areas, position plants away from buildings and prune out old dry foliage at the base each year so the dense, dry leaves do not act as a ladder for flames when growing Richards toetoe.

Common Pests and Diseases

Leaf spot fungi

This disease causes tan to dark brown spots or bands on older leaves, often starting near the tips or margins. Symptoms include gradual expansion of spots and premature browning and shredding of foliage, especially in dense, humid clumps.

Solution

Remove and dispose of heavily spotted or dead leaves to reduce inoculum, and avoid overhead watering that keeps foliage wet for long periods. Improve spacing and airflow through the clump, and in persistent cases apply a labeled broad-spectrum ornamental grass fungicide in early spring when new foliage emerges.

Fusarium crown rot

This disease affects the basal clump, leading to yellowing, collapse of outer leaves, and a dry, reddish-brown discoloration at the crown. Symptoms include poor regrowth after cutting back and progressive dieback of individual tussocks in wet, compacted sites.

Solution

Dig out and destroy severely affected plants, including as much of the crown and surrounding infected debris as possible. Replant only into free-draining soil or raised beds, avoid overwatering and heavy summer irrigation, and source replacement plants from reputable nurseries with clean stock to support long-term Austroderia richardii care instructions.

Aphids

These insects cluster on young flowering stems and leaf bases, sucking sap and causing distortion and sticky honeydew on surrounding foliage. This pest can encourage sooty mold growth on the honeydew and weaken flowering performance in stressed plants.

Solution

Wash colonies off with a firm stream of water from a hose, repeating as needed during active growth. Encourage natural predators such as lady beetles, and if infestations persist, use a targeted low-toxicity product like insecticidal soap or horticultural oil applied in the cool part of the day.

Mealybugs

These insects appear as white, cottony masses hidden in the leaf bases and within the dense crowns, where they feed on sap and can cause localized yellowing and decline. This pest is more common on plants grown in sheltered, dry sites or in container culture.

Solution

Inspect the crown and leaf bases regularly and remove small clusters with a cotton swab dipped in alcohol or by pruning out heavily infested sections. For broader infestations, apply insecticidal soap or horticultural oil thoroughly into the crown area and repeat according to label directions, while also reducing plant stress with correct watering and light.

Spider mites

These pests are tiny sap-feeding arachnids that thrive in hot, dry, and windy positions, causing fine stippling, dulling of foliage color, and eventual bronzing of leaves. Symptoms include very fine webbing between leaves and along leaf margins when populations build up.

Solution

Increase ambient humidity around the plant by occasional hosing of the foliage, which also helps physically dislodge mites and dust. In more serious cases, apply a miticidal product or horticultural oil labeled for spider mites, ensuring both leaf surfaces are covered, and maintain regular monitoring during hot, dry periods.

Interesting Facts

South Island riverbank specialist

This species is naturally restricted to the South Island of New Zealand, where it is strongly associated with braided river systems, terraces, and stony alluvial soils along rivers such as the Rakaia and Waimakariri.

Wind-adapted flower plumes

Its tall, narrow plumes are structured for wind pollination, with many small, dangling spikelets that expose the pollen and stigmas efficiently to moving air rather than relying on insect visitors.

Role in riverbed stability

The dense, fibrous root system helps bind loose gravels and sands, contributing to bank stabilization and providing structure in dynamic floodplain habitats that experience frequent disturbance.

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Did you know?

In Māori tradition this grass, known as toetoe, was historically used for practical purposes such as thatching, lining food storage pits, and occasionally in weaving, making it both an ecological and cultural component of New Zealand river landscapes.

FAQs about Richards toetoe

This grass forms large, expanding clumps over time but does not run by stolons or rhizomes. It can self-seed in suitable climates, so remove flower heads before seed set if spread needs to be limited.

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