Mountain Snowberry

Botanical name: Gaultheria depressa var. depressa
Synonyms: Gaultheria antipoda var. depressa
Common name(s): Mountain Snowberry, Alpine Wax Berry

About:
Mountain Snowberry is a low, creeping alpine shrub that forms dense mats across rocky ground, herbfields and open tussock country. It is distinguished by its small rounded leathery leaves, dark bristly twigs, white bell-shaped flowers and conspicuous waxy fruit, which may ripen white, pink or red.

Unlike the endemic variety Gaultheria depressa var. novae-zealandiae, this variety also occurs naturally in Tasmania. Its compact evergreen habit, edible fruit and exceptional cold tolerance make it a highly attractive species for alpine gardens and cool-climate rockeries.

Natural habitat:
Occurs in subalpine and alpine herbfields, tussock grasslands, rocky outcrops, fellfields, scree margins and open mountain shrublands.

It grows in exposed places where soils are shallow, acidic and freely draining, often amongst stones, mosses and low alpine vegetation. It may also occur around damp hollows and the margins of alpine wetlands, although it is primarily an upland species.

Growing environment:
Prefers full sun or light shade in cool conditions with acidic, humus-rich and sharply drained soil.

It tolerates severe frost, snow, wind and exposed alpine conditions but dislikes prolonged heat, humidity and stagnant moisture. Regular moisture is beneficial during active growth, provided the roots remain well aerated.

Endemic distribution:
Indigenous to New Zealand but not endemic, also occurring naturally in Tasmania.

Within New Zealand it is found in subalpine and alpine districts of the North and South Islands.

Height:
Typically 5–15 cm

Width:
Approximately 30 cm–1 m, spreading gradually through creeping stems

Flowering:
October–January

Fruiting:
January–May

Uses:
• Alpine gardens
• Rock gardens
• Native ground cover
• Trough gardens
• Scree and gravel plantings
• Wildlife gardens
• Soil protection on exposed slopes
• Edible berry planting

Appearance:
Growth habit:
A prostrate to low-growing evergreen shrub with much-branched stems that interlace across the ground.

The stems may root where they contact suitable soil, allowing the plant to develop broad, dense mats over rocks, gravel and alpine turf.

Stems:
Young twigs are slender and covered with conspicuous dark, stiff, bristly hairs.

Older stems become woody and are often hidden beneath the closely packed foliage.

Leaves:
Leaves are alternately arranged, rounded to broadly oval and usually 5–10 mm long and 4–6 mm wide.

They are thick, leathery and green to dark green, with wavy or finely serrated margins. Small marginal hairs are clearly visible, particularly on young foliage.

The leaves may develop bronze, red or purple colouring in cold, exposed conditions.

Flowers:
Small white bell-shaped flowers are produced singly from the leaf axils.

They are carried on short stalks and usually hang beneath or among the leaves. A pale pink flush may occasionally appear as the flowers age.

Fruit:
The fruit is rounded, waxy and approximately 6–10 mm wide.

It has a distinctly lobed appearance and varies from white through pink to red. The fruit is often held close to the ground beneath the foliage, where it is accessible to lizards and invertebrates.

The berries are edible.

Seeds:
Each fleshy fruit contains numerous small seeds.

The fruit is eaten by birds, native lizards, ground wētā and other invertebrates, which help disperse the seed. Its ground-hugging habit appears particularly suited to dispersal by animals moving through alpine vegetation.

Ecology:
Mountain Snowberry is an important component of alpine ground-cover communities. Its creeping stems and dense roots help protect shallow soils and reduce erosion across exposed rocky terrain.

The flowers provide nectar and pollen for small alpine insects, while the fruit is eaten by native birds, lizards and invertebrates.

Ground wētā have been recorded feeding on snowberry fruit, and lizards are considered important potential seed dispersers.

This variety may hybridise with other native Gaultheria species, including Gaultheria crassa, where their ranges overlap.

Associated habitats:
Alpine herbfields, fellfields, scree margins, rocky outcrops, tussock grasslands, gravel terraces and open subalpine shrublands.

Associated plants may include Celmisia, Raoulia, Leptinella, alpine gentians, native buttercups, snow tussocks, small hebes and other native snowberries.

How to grow:
Plant in full sun or light shade in a cool position with acidic, humus-rich and very free-draining soil.

A gritty alpine mix containing pumice, coarse sand, fine bark and leaf mould is ideal. Keep the soil evenly moist during establishment, but avoid prolonged waterlogging.

Protect from hot afternoon sun in warmer districts and provide good air circulation. This plant is best suited to alpine troughs, raised rock gardens and naturally cool climates.

Little pruning is required beyond removing damaged stems or lightly trimming unwanted spread.

Propagation:
Propagation may be achieved from fresh seed, semi-hardwood cuttings, layering or carefully separated rooted stems.

Clean ripe fruit from the seed and surface-sow onto an acidic, free-draining propagation medium. Keep cool, moist and lightly shaded, as germination may be slow.

Cuttings taken from firm young growth provide the best method of preserving desirable fruit colour and growth habit.

Cultural use:
Specific traditional Māori uses for this variety are not widely documented, although the edible fruit of native snowberries was known and gathered in some regions.

Early European settlers in southern Otago reportedly used snowberry fruit to make pies.

The species name depressa refers to the plant’s flattened, ground-hugging growth habit.

Garden value:
Mountain Snowberry is an excellent miniature native shrub for alpine troughs, rockeries and cool-climate ground-cover planting.

Its dense evergreen foliage, delicate white flowers and attractive white to red fruit provide interest across several seasons. It combines well with native alpine daisies, gentians, creeping hebes and small tussocks.

The plant is best reserved for cool, sharply drained sites where its alpine growing requirements can be reproduced.