Moore’s Mikoikoi
Botanical name: Libertia mooreae
Synonyms: None
Common name(s): Moore’s iris, Moore’s mikoikoi, native iris
About
Libertia mooreae is an endemic New Zealand perennial of the iris family, Iridaceae, found primarily in the northern South Island and extending into the southern North Island. It forms compact fans of narrow green to bluish-green leaves from short, highly branched rhizomes. During late winter and spring, slender flowering stems rise conspicuously above the foliage and carry delicate white flowers, often with beige or pink colouring on the outer tepals and bright yellow anthers. The species was historically included within Libertia grandiflora but is distinguished by its smaller stature, evenly spaced leaf veins, red-purple leaf bases and distinctive capsules and seeds.
Natural habitat
Occurs from coastal to montane environments, particularly in open lowland forest remnants, forest margins, steep slopes, ridgelines, bluffs, cliffs, rocky river banks, stream banks and river terraces.
It is associated with beech and podocarp forest margins as well as mānuka-dominated scrub and other relatively open native vegetation. Plants often occupy situations where they receive filtered light or partial sun rather than the deep shade of closed forest.
Growing environment
Adaptable to a wide range of growing conditions but performs particularly well in semi-shade. It prefers reasonably fertile, free-draining soil with reliable moisture during establishment and active growth.
It tolerates exposed banks, rocky sites and periods of seasonal dryness once established but should not be planted in permanently waterlogged soil. Its natural occurrence from coastal to montane environments indicates good tolerance of cool conditions and frost.
Endemic distribution
Endemic to New Zealand. It occurs predominantly in the northern South Island, including Nelson, Tasman and Marlborough, and extends into the southern North Island as far north as the Manawatū Gorge.
Within the northern South Island there is considerable variation between populations. Marlborough plants may be comparatively small and grass-like, while plants from areas such as the Aorere River can be considerably larger.
The species is of particular regional significance in Nelson–Tasman, where it occurs naturally in suitable forest-margin, rocky and riverine habitats.
Height
Leaves approximately 100–400 mm long. Flowering stems are considerably taller, approximately 140–560 mm, and characteristically carry the flowers above the foliage.
Width
Typically forms compact clumps approximately 20–50 cm across, gradually increasing in size through its short, highly branched rhizomes. It does not form the widely spreading colonies characteristic of long-rhizomed species such as Libertia peregrinans.
Flowering
August–November. Flowers are approximately 10–20 mm diameter and are carried on tall, openly branched inflorescences above the leaves. Each branch may carry approximately 1–7 flowers.
The inner tepals are white, while the smaller outer tepals can be beige or pink externally, giving some flowers a subtle pinkish appearance before and during opening.
Fruiting
December–February. Small ribbed, barrel-shaped capsules develop after flowering, usually approximately 5–8 mm long and 3–5 mm diameter. They mature from green to brown or black and open partially, although some capsules may split more completely. Seeds are yellow to yellow-orange.
Uses
Native garden borders
Forest-margin planting
Nelson–Tasman native gardens
Rockeries and rocky banks
Stream-bank planting
Open woodland gardens
Mass planting
Containers
Native revegetation within its natural range
Specialist collections of northern South Island flora
Feature planting for spring flowers
Eco-sourced restoration projects
Appearance
Growth habit: A relatively small, compact evergreen perennial producing closely grouped fans of narrow leaves from short, extensively branched rhizomes. The plant remains clump-forming rather than developing long spreading runners.
Leaves: Approximately 100–400 × 1–4 mm, narrow, slightly curved and green to distinctly glaucous or bluish-green. Some forms have leaves that are consistently concave toward the same surface. The bases are characteristically red-purple, providing a useful identification feature.
Numerous veins run along the leaves and are relatively evenly spaced rather than becoming strongly crowded toward the centre to produce the conspicuous midrib seen in several other New Zealand Libertia. The margins are finely rough or scabrid.
Flowers: Approximately 10–20 mm diameter and carried above the foliage on slender stems. The three inner tepals are broad, rounded and white, sometimes overlapping the smaller outer tepals. The three outer tepals are elliptical, boat-shaped and greater than half the length of the inner tepals but less than one-third their area. They may be beige or pink externally. Yellow anthers approximately 2–3 mm long form a conspicuous centre.
Fruit: Small, ribbed, barrel-shaped capsules, generally reaching approximately 5–8 × 3–5 mm. Capsules mature from green to brown or black and open through short longitudinal splits. The seeds are approximately 1 × 1–1.5 mm, globose to angular and yellow to yellow-orange.
Ecology
Libertia mooreae occupies open and transitional habitats from coastal areas into montane environments. Its occurrence on forest margins, rocky slopes, cliffs, river banks and ridges reflects an ability to tolerate both relatively exposed conditions and the filtered light of open woodland.
The compact rhizomatous growth habit enables established plants to form persistent clumps on banks and rocky substrates without the extensive lateral spread characteristic of some related Libertia.
Its flowers provide resources for insects, while the small seeds are released from mature capsules and can establish in suitably open ground.
Geographic variation within the species is considerable. Plants from different populations can differ noticeably in size and foliage, making preservation of local genetic forms important in ecological restoration.
Associated habitats
Associated with beech forest margins, podocarp forest, mānuka scrub, open lowland forest remnants, rocky ridges, bluffs, cliffs, steep slopes, stream banks and river terraces.
Within Nelson–Tasman it may occur alongside southern beech, podocarps, mānuka, kānuka, coprosmas, native grasses, sedges, ferns and other species characteristic of open forest and rocky river systems.
How to grow
An attractive and relatively straightforward Libertia to cultivate. Plant in partial shade to morning sun in moist but freely draining soil. Although tolerant of a broad range of situations, semi-shade generally produces particularly good foliage and growth.
Water regularly while young. Once established, plants tolerate periods of reduced moisture but benefit from supplementary watering during prolonged dry conditions. Avoid permanently saturated soils.
Old foliage and spent flowering stems can be removed as required. Mature clumps can be divided periodically to rejuvenate plants or produce additional specimens.
For restoration and conservation planting, locally eco-sourced material is particularly desirable because populations show noticeable geographic variation. This is especially relevant within Nelson, Tasman and Marlborough, where maintaining distinct local forms helps preserve the species’ natural diversity.
Propagation
Easily propagated from fresh seed or by division of established plants.
Collect mature capsules during summer as they turn brown to black. Remove the yellow to yellow-orange seeds and sow fresh into a moist, free-draining seed-raising medium. Fresh seed generally germinates readily.
For division, separate established clumps into smaller sections, ensuring each retains healthy roots, rhizome and leafy shoots. Replant promptly and keep consistently moist until established.
Division produces genetically identical plants, while seed propagation should be favoured where maintaining genetic diversity within conservation collections or restoration projects is important.
Cultural use
Mikoikoi is a Māori name associated with several New Zealand Libertia species. Specific traditional uses attributable solely to Libertia mooreae are not well documented, and records applying more generally to mikoikoi should therefore not automatically be assigned to this species.
The species is nevertheless a distinctive component of the native flora of Te Waipounamu and the southern North Island, with particularly strong botanical relevance to Nelson, Tasman and Marlborough.
Garden value
A particularly attractive smaller native iris, combining fine blue-green to green foliage with red-purple leaf bases and delicate white spring flowers held well above the leaves. The occasional pink or beige colouring of the outer tepals adds subtle variation to the floral display.
Its compact clump-forming habit makes it useful where the strongly spreading nature of species such as Libertia peregrinans would be undesirable. It works well along paths, in rockeries, beneath open native trees, amongst low shrubs or planted repeatedly through a partially shaded native border.
For Nelson–Tasman gardens, Libertia mooreae has especially high value. It is naturally part of the region’s flora, and locally eco-sourced plants can combine ornamental value with conservation of distinctive regional populations.