Arthropodium cirratum – New Zealand Rock Lily

Arthropodium cirratum – New Zealand Rock Lily

$30.00

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Size: 20cm

20cm

Current Stock Height Guides

20cm: Enquire within for height guide information.

Height guide disclaimer: Height ranges are approximate only. As living products, plant heights naturally vary between individual plants, batches, and seasons. No guarantee is given that supplied plants will fall within the stated range. If minimum heights are required, you mustconfirm current batch heights with Evergreen Trees Direct prior to purchase. Variation in height is normal and is not grounds for return, refund, replacement, or compensation.

Mature Height & Width

Mature Height: 0.4m to 0.7m (in flower)

Mature Width: 0.6m to 1m

Arthropodium cirratum – New Zealand Rock Lily is expected to grow .

Root Ball Dimensions

Use this as a reference when digging your planting hole. We recommend digging at least 10% wider than the dimensions below to encourage strong root development.

30cm Pot: 33cm (W) × 30cm (D)
40cm/45L Pot: 44cm (W) × 41.5cm (D)
50cm Pot / 70L Pot: 55cm (W) × 41.8cm (D)
100L Bag: 50.6cm (W) × 52.8cm (D)
150L Bag: 66cm (W) × 55cm (D)
200L Bag: 71.5cm (W) × 60.5cm (D)
300L Bag: 88cm (W) × 63.8cm (D)
400L Bag: 99cm (W) × 66cm (D)
500L Bag: 122cm (W) × 66cm (D)
750L Bag: 134cm (W) × 69cm (D)
1000L Bag: 146.3cm (W) × 71.5cm (D)
2000L Bag: 176cm (W) × 82.5cm (D)

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About Your New Arthropodium cirratum – New Zealand Rock Lily

Arthropodium cirratum, the New Zealand Rock Lily or Renga Renga, is an evergreen clumping perennial with broad, arching grey-green strappy foliage. In spring and early summer it throws up airy sprays of small white star-shaped flowers on slender stems held well above the leaves.

Its real value is dry shade. Most flowering plants sulk under an established canopy or against a south wall, and this one thrives there, forming a dense weed-suppressing carpet in positions where little else performs. It also takes full sun in cooler districts and handles coastal exposure and salt spray.

Foliage sits around 40 to 50 centimetres with flower stems to 70 centimetres, and clumps spread steadily to about a metre. Once established it is genuinely drought tolerant. It is not a plant for heavy frost, so in cold inland districts give it a sheltered position or grow it in a pot that can be moved.

Use it massed under trees, along a shaded boundary, as a soft edge to a path, in a rockery, or in pots on a shaded terrace. It suits coastal, native-adjacent, modern and low-maintenance schemes.

Frequently Asked Questions

About New Zealand Rock Lily

What is Arthropodium cirratum?

It is an evergreen clumping perennial native to New Zealand, where it grows on coastal cliffs and rocky slopes. It is known as the New Zealand Rock Lily, Renga Renga, or Rengarenga Lily. It is grown for its broad arching grey-green foliage and its sprays of small white flowers in spring.

Will it grow in shade?

Yes, and this is the main reason to plant it. It performs in part to full shade, including dry shade under established trees and against south-facing walls where most flowering plants struggle. In cooler districts it also takes full sun, though foliage holds better colour with some protection from harsh afternoon light.

How big does it grow?

Foliage reaches roughly 40 to 50 centimetres tall, with flower stems to around 70 centimetres in spring. Clumps spread steadily to about a metre across. It is a groundcover rather than a shrub, so it stays low and fills horizontally.

When does it flower?

Spring into early summer. Slender stems carry loose sprays of small white star-shaped flowers well above the foliage, giving several weeks of light, airy display. Trimming spent stems at the base after flowering keeps the clump tidy.

Is it frost tolerant?

Only lightly. It handles a light frost but foliage is damaged by moderate to heavy frost, so it is not suited to cold inland or tablelands gardens in an exposed position. In those districts plant it under canopy, against a warm wall, or in a pot that can be moved through winter.

Is it suitable for coastal gardens?

Yes. It grows naturally on New Zealand coastal cliffs, so it takes salt spray, wind and sandy free-draining soils without trouble. It is one of the better shade-tolerant choices for a coastal garden.

How far apart should I plant it?

Space 50 to 70 centimetres apart for a continuous groundcover that closes over in two to three seasons, or a metre apart if you want individual clumps to read separately. Closer spacing suppresses weeds faster.

How do I care for it?

Water regularly through the first summer while it establishes, then only in extended dry spells. Mulch the root zone and feed with a slow release fertiliser in early spring. Remove spent flower stems and any tired outer leaves. Divide congested clumps in autumn or early spring if they thin in the centre.

Uses in my Garden

Underplanting
Plant in Pots (or) Suitable for Pots
Shrubs

Arthropodium cirratum – New Zealand Rock Lily works in an:

Coastal Garden – relaxed, seaside feel with hardy, textural plants.
Woodland Garden – layered, naturalistic design under dappled light.
Modern Garden – sleek, minimal, and design-led planting.
Low-maintenance Garden – resilient choices for easy care and year-round appeal.
Japanese Inspired – serene balance of form, foliage, and flow.

Is Arthropodium cirratum – New Zealand Rock Lily Evergreen or Deciduous?

Arthropodium cirratum – New Zealand Rock Lily is an Evergreen (foliage year round) Tree

Mature Height & Width

Mature Height: 0.4m to 0.7m (in flower)

Mature Width: 0.6m to 1m

Arthropodium cirratum – New Zealand Rock Lily is expected to grow .

Growth Rate of Arthropodium cirratum – New Zealand Rock Lily

Arthropodium cirratum – New Zealand Rock Lily is expected to grow .

They are considered to have a:

Medium Growth Rate

Frost Tolerance & Ideal Climate to plant Arthropodium cirratum – New Zealand Rock Lily

Is Arthropodium cirratum – New Zealand Rock Lily frost tolerant?

Arthropodium cirratum – New Zealand Rock Lily is Frost Sensitive – May suffer damage from frost, best in frost-free or protected spots.

Does Arthropodium cirratum – New Zealand Rock Lily Flower?

Slender stems carry loose sprays of small white star-shaped flowers well above the foliage through spring and into early summer, giving several weeks of light, airy display. Trimming the spent stems at the base afterwards keeps the clump looking tidy.

Does Arthropodium cirratum – New Zealand Rock Lily flower?

Yes - Flowers

Flowering Period:

Spring
Summer

Flower Type:

Flower Colour:

White

Is Arthropodium cirratum – New Zealand Rock Lily an Australian Native Tree?

No

Arthropodium cirratum – New Zealand Rock Lily is Native to New Zealand, where it grows on coastal cliffs, rocky slopes and forest margins, largely across the North Island and northern South Island.

What is the Wildlife Value of Arthropodium cirratum – New Zealand Rock Lily ?

The airy spring flower sprays draw bees, hoverflies and other small pollinators, while the dense evergreen clumps provide ground-level shelter for skinks, frogs and beneficial insects in shaded parts of the garden.

How much Sunlight does Arthropodium cirratum – New Zealand Rock Lily need?

Arthropodium cirratum – New Zealand Rock Lily will thrive best in:

Part Shade
Full Shade

Preferred Soil?

Free-draining sandy or loam soils suit it best, reflecting its natural home on coastal cliffs and rocky slopes. It tolerates poorer ground provided drainage is reliable, but will rot in heavy clay or persistently wet positions unless the bed is raised or improved with coarse material and compost.

Is Arthropodium cirratum – New Zealand Rock Lily Drought Tolerant?

Is Arthropodium cirratum – New Zealand Rock Lily Drought tolerant?

Water regularly through the first summer while the clump establishes. After that it is genuinely drought tolerant, which is what makes it so useful in dry shade under established trees where root competition takes most of the available moisture.

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How To Plant Your Arthropodium cirratum – New Zealand Rock Lily

Site: Choose a free-draining position in part to full shade. Avoid low spots where water sits.

Soil preparation: Work compost through the bed and add coarse material to sharpen drainage in heavier ground.

Hole: Dig twice as wide as the root ball and the same depth.

Planting: Set the crown level with the surrounding soil, never buried, backfill gently, firm in and water deeply to settle the roots.

Recommended Planting Spacing For Your Arthropodium cirratum – New Zealand Rock Lily

Continuous groundcover: 50 to 70 centimetres apart, closing over in two to three seasons.

Individual clumps: 1 metre apart so each clump reads separately.

Pot or container: A 40 centimetre wide free-draining pot suits a single clump on a shaded terrace.

Arthropodium cirratum – New Zealand Rock Lily is expected to grow .

Medium Growth Rate

Long Term Care For Your Arthropodium cirratum – New Zealand Rock Lily

Watering: Water twice weekly through the first summer. Once established it needs water only in extended dry spells.

Mulching: Apply a 3 to 5 centimetre layer of organic mulch over the root zone, keeping it clear of the crown.

Tidying: Cut spent flower stems back to the base after flowering and remove any tired outer leaves. Divide congested clumps in autumn or early spring if they thin in the centre.

Fertilising: Apply a slow-release general-purpose fertiliser in early spring.

Pest and disease: Largely trouble free. Watch for slugs and snails on new growth in wet weather.