Coprosma is a large genus of evergreen shrubs and small trees native to New Zealand, Australia, and parts of the Pacific, prized in gardens for their extraordinarily glossy foliage and vibrant leaf colors that range from deep green to bronze, orange, and electric pink. Most garden cultivars descend from Coprosma repens (mirror plant or looking-glass plant), though species like C. robusta, C. propinqua, and several hybrids are increasingly popular. They grow best in mild, frost-light climates with well-drained soil, and once established, most tolerate coastal exposure, moderate drought, and lean soils better than many ornamental shrubs. Getting them off to a good start, though, depends on matching the right species to your climate and giving them a few essentials at planting time.
Choosing the Right Species or Cultivar
The genus Coprosma contains well over 100 species, but only a handful turn up regularly in nurseries. The most widely sold is C. repens, the mirror plant, which forms a dense rounded shrub up to about three meters tall with thick, reflective leaves. Its cultivars are where the colorful foliage comes from: ‘Coppershine’ has coppery-orange leaves, ‘Tequila Sunrise’ leans toward gold and red, ‘Pacific Sunset’ goes deep bronze-purple, and ‘Rainbow Surprise’ blends pink, cream, and green on the same plant. These cultivars are what most people picture when they hear the name Coprosma.
Other species are worth knowing about, especially if you live somewhere colder or drier. C. propinqua is a divaricating shrub (it has a distinctive tangled branching habit) that has proven more cold-hardy than C. repens and tolerates drier conditions. Evaluation trials in France identified C. propinqua as one of the most promising New Zealand species for ornamental use in cooler European climates, surviving repeated cold winters that killed less tolerant species.1Acta Horticulturae. THE ACCLIMATIZATION AND SELECTION OF NEW ZEALAND PLANTS FOR ORNAMENTAL USE IN EUROPE C. robusta, called karamū, is a larger plant often used in native restoration planting, though it is less drought-tolerant than some of its relatives. C. lucida, the shining karamū, has large glossy leaves and works well as a hedging plant in mild coastal zones.
If your main goal is ornamental foliage color, stick with the C. repens cultivars but accept that they are the least cold-hardy group. If you want toughness, look to the species types or hybrids bred from the hardier parents. Some nurseries now sell crosses between C. repens and hardier species that aim to combine colorful leaves with better cold tolerance.
Where and When to Plant
Coprosma needs a spot with good drainage above all else. In their native habitat, many species grow on coastal banks, rocky slopes, and forest margins where water moves through the root zone quickly. Heavy clay that stays waterlogged, especially in winter, is the fastest way to kill a young plant. If your soil is heavy, raise the planting area or work coarse grit and organic matter through it before planting.
Full sun brings out the best leaf color in the variegated and bronze-leaved cultivars. In partial shade, the foliage often reverts toward plain green, which defeats the purpose if you bought the plant for color. That said, some of the green-leaved species like C. robusta and C. lucida naturally grow in forest understory and handle shade well.
Spring planting is ideal in most climates because it gives the root system a full growing season to establish before winter. In truly frost-free zones you can plant in autumn. Dig the hole about twice the width of the root ball and the same depth. Set the plant so the top of the root ball sits level with or slightly above the surrounding soil. Backfill, firm gently, and water deeply. A layer of mulch around the base helps retain moisture and suppress weeds, but keep it a few centimeters away from the trunk to avoid encouraging rot at the base.
Watering and Drought Tolerance
How much water a Coprosma needs depends a lot on which species you are growing. The genus spans a surprisingly wide range of drought tolerance. Research on water relations in New Zealand shrubs found that C. propinqua maintains low water potential at full turgor, a trait associated with the ability to keep functioning under dry conditions.2New Phytologist. WATER RELATIONS OF SOME NATIVE AND EXOTIC SHRUBS OF NEW ZEALAND In plain terms, this species holds onto water efficiently and can tolerate drier soil without wilting.
At the other end of the spectrum, C. robusta and C. australis are among the most drought-sensitive species in the genus. In observations during a summer drought near Dunedin, New Zealand, both species were among the first shrubs to wilt, doing so at relatively mild levels of water stress that other species shrugged off.3New Zealand Journal of Botany. Observations on water potential and drought resistance of trees and shrubs after a period of summer drought around Dunedin, New Zealand The popular garden species C. repens falls somewhere in the middle: it handles coastal dry spells reasonably well once established, especially in free-draining soil, but young plants and container-grown specimens need consistent watering through their first summer.
A practical watering approach for most garden Coprosma: water deeply once or twice a week during the first growing season, then taper off as the roots spread. Established plants in the ground rarely need supplemental water except during extended hot, dry spells. Container plants dry out faster and should be checked regularly. If you are growing C. robusta or C. australis, expect to water more often than you would for other species, especially in exposed or sandy sites.
Cold Hardiness and Temperature Limits
Cold tolerance is the main limiting factor for growing Coprosma outside its native range. Most C. repens cultivars handle light frosts down to roughly minus five or six degrees Celsius without damage, but a hard freeze will burn foliage and can kill branches or the whole plant. In USDA terms, they are generally rated for zones 9 through 11, though gardeners in sheltered spots in zone 8b sometimes get away with them against a warm wall.
The hardier species tolerate substantially more cold. Research on frost resistance across several Coprosma species found that the temperature causing 50% tissue damage in leaves ranged between roughly minus 8° and minus 14°C, depending on the species and the altitude where the plant was collected. Higher-altitude populations were more frost-resistant than lowland ones of the same species, and frost resistance in leaves correlated with the altitude of the collection site.4New Zealand Journal of Botany. The frost resistance of fruits and leaves of some Coprosma species in relation to altitude and habitat This means that seed-grown plants sourced from montane populations may be tougher than those from coastal nurseries.
The French acclimatization trials mentioned earlier showed that repeated cold winters acted as natural selection pressure, killing off the least hardy individuals and leaving survivors with improved cold tolerance. Genotypes that survived these events were flagged as potential parents for breeding hardier ornamental lines.1Acta Horticulturae. THE ACCLIMATIZATION AND SELECTION OF NEW ZEALAND PLANTS FOR ORNAMENTAL USE IN EUROPE If you live in a borderline climate, look for cultivars bred from these cold-selected lineages, or plant against a south-facing wall (north-facing in the Southern Hemisphere) where radiated heat offers a buffer on cold nights. Wrapping the crown in horticultural fleece during forecast hard frosts is a reasonable precaution for young plants in their first couple of winters.
Feeding and Nutrient Needs
Coprosma is not a heavy feeder, but leaf drop on the colored cultivars is a real problem when nutrition runs low. Research on the cultivar ‘Coppershine’ found that tissue nitrogen concentration needs to stay above about 4% to prevent leaves from dropping prematurely. The same study showed that a steady, slow supply of nutrients performed better than heavy intermittent feeding: plants given a controlled-release fertilizer maintained their foliage through an 18-day simulated indoor environment test with no leaf drop, while under-fed plants shed leaves rapidly.5Scientia Horticulturae. Pre- and post-production characteristics of Coprosma as influenced by temperature, irradiance, and nutrient treatments
In practical terms, this means a single application of slow-release granular fertilizer in early spring is usually all a garden Coprosma needs. Look for a balanced or slightly nitrogen-rich general-purpose formula. For container plants, the steady-release approach matters even more because nutrients leach out with every watering. Refresh the slow-release granules every three to four months during the growing season. Avoid dumping a large dose of liquid fertilizer on a hungry plant all at once; you are better off with a small, continuous supply.
If your soil is naturally alkaline, it is worth noting that the French trials also revealed variation between Coprosma species in how well they handle lime-rich soils.6ISHS Acta Horticulturae. THE ACCLIMATIZATION AND SELECTION OF NEW ZEALAND PLANTS FOR ORNAMENTAL USE IN EUROPE Most Coprosma prefer a mildly acidic to neutral pH. If your soil is chalky, incorporating acidic organic matter like composted pine bark can help, or grow the plant in a container with ericaceous compost.
Propagation from Seed
Growing Coprosma from seed is possible but requires patience. The seeds have a natural dormancy that slows germination considerably. In a study of C. robusta, only about half the seeds had germinated after 12 months, and germination improved substantially when seeds were given at least four weeks of cold, moist stratification beforehand.7New Zealand Journal of Botany. Seed dormancy and germination of a panel of New Zealand plants suitable for re‐vegetation Extended tracking of the same species showed germination climbing to around 80% after two full years, with rates increasing further when the cold stratification period was extended to eight weeks or more.8Massey University. Seed dormancy and germination of a panel of New Zealand plant species
Light is also essential. No C. robusta seeds germinated in the dark in either study, so sow them on the surface of moist seed-raising mix and press them in lightly rather than burying them. Place the tray somewhere bright but out of direct harsh sun, and keep the mix evenly moist. If you can, stratify the seeds first by mixing them with damp sand in a sealed bag and storing them in the fridge for six to eight weeks before sowing.
Seed propagation produces variable offspring, so you will not get an exact copy of a named cultivar this way. It is mainly useful for restoration projects or if you want to grow a species type. For cultivars like ‘Coppershine’ or ‘Tequila Sunrise,’ vegetative propagation is the way to go.
Propagation from Cuttings
Semi-ripe cuttings taken in late summer or early autumn are the standard commercial method and the easiest route for home gardeners who want to replicate a specific cultivar. Select a healthy shoot of the current season’s growth that has started to firm up at the base but is still flexible at the tip. Cut a piece about 10 to 15 centimeters long, strip the lower leaves, dip the base in rooting hormone, and insert it into a pot of free-draining cutting mix (perlite and peat, or perlite and coir, in roughly equal parts).
Keep the cuttings in a sheltered spot with indirect light and high humidity. A clear plastic bag over the pot or a propagation lid works well. Bottom heat from a propagation mat speeds rooting but is not strictly necessary in warm weather. Roots typically form in four to eight weeks. Once the cutting resists a gentle tug, it has rooted and can be potted on into a slightly larger container with regular potting mix. Harden it off gradually before planting outdoors.
Coprosma cuttings root readily compared to many other evergreen shrubs, which is one reason the genus has taken off commercially. Success rates north of 80% are common with fresh material and basic care.
Pests and Diseases
Coprosma is relatively trouble-free, but a few problems recur. Scale insects are the most common pest, appearing as small brown or white bumps on stems and leaf undersides. Heavy infestations cause sooty mold on the foliage (a black fungal coating that grows on the sticky honeydew the scale excretes). Treat light infestations by wiping them off or pruning out badly affected stems; for heavy ones, a horticultural oil spray applied in early spring or late autumn smothers the crawlers effectively.
The most serious disease threat, especially in nursery production, is crown and root rot. A documented outbreak on potted C. repens and C. lucida in a Sicilian nursery caused roughly 30% disease incidence in a stock of about 12,000 plants. Symptoms started as water-soaked lesions at the base of the trunk, followed by root rot; older lesions turned orange to brown, leaves yellowed and then died, and the plant eventually collapsed.9Plant Disease. First Report of Crown and Root Rot Caused by Rhizoctonia solani AG-4 on Coprosma repens and C. lucida in Italy The pathogen involved was Rhizoctonia solani, a common soil-borne fungus that thrives in warm, wet conditions.
For home gardeners, the main takeaway is prevention through good drainage. Avoid planting Coprosma in low spots where water pools, and do not pile mulch against the trunk. Container plants should never sit in saucers of standing water. If you notice a young plant yellowing and wilting despite adequate watering, dig it up and check the roots. Healthy roots are white and firm; rotted ones are brown and mushy. There is no easy cure once crown rot has set in, so removing and disposing of the affected plant and its soil is usually the wisest course.
Pruning and Shaping
One of Coprosma’s biggest selling points is how well it responds to pruning. You can let it grow into a natural mounded shrub, clip it into a formal hedge, or train it as a standard (a ball of foliage on a bare stem). The glossy leaves look good in all these forms.
For hedges, trim two or three times during the growing season to keep the shape tight. The best time for a hard renovation prune, if the plant has gotten leggy, is early spring just as new growth starts. Coprosma sprouts freely from old wood, so you can cut back quite hard without killing the plant, though a severely pruned specimen will look bare for a few months before it fills in again.
Variegated cultivars sometimes throw out plain green shoots, which grow more vigorously than the variegated growth and can take over if left unchecked. Remove these reversions as soon as you spot them by cutting back to the point where the variegation begins. This is not a sign of a sick plant; it is just the genetics of chimeral variegation, where a mutation in the outer cell layer can occasionally revert.
Using Coprosma in the Landscape
The mirror-bright foliage makes Coprosma useful as a contrast plant in mixed borders, particularly alongside matte-leaved shrubs or silver-foliaged plants like lavender and Convolvulus cneorum. The colored cultivars work well in containers flanking doorways, and the bronze and orange forms are striking when backlit by low winter sun.
In coastal gardens, Coprosma earns its keep as a windbreak or shelter hedge. The thick, waxy leaves resist salt spray better than most evergreens, and the dense branching habit breaks the wind effectively. C. repens is commonly used for this purpose in coastal New Zealand, Australia, and parts of California and the Mediterranean.
For anyone interested in supporting native wildlife, the fruiting Coprosma species are valuable. The small, fleshy drupes ripen in shades of orange, red, or blue-black depending on the species and are eaten by a wide variety of birds. In alpine New Zealand, kea (the mountain parrot) turned out to be the single most important bird disperser of fruiting shrubs, consuming and dispersing far more seeds than all other alpine bird species combined.10Scientia Horticulturae. Alpine flora may depend on declining frugivorous parrot for seed dispersal Coprosma species are among the fruiting plants in these ecosystems. In gardens outside New Zealand, the berries still attract local frugivorous birds readily.
Coprosma is dioecious, meaning individual plants are either male or female. If you want berries, you need at least one male and one female plant in reasonable proximity for pollination. Many nursery-sold cultivars are selected for foliage, and the sex is not always labeled, so it can be a bit of a gamble unless you buy plants that are already flowering and can be sexed. Male flowers are small clusters of stamens; female flowers have prominent feathery stigmas. If you care about fruit, ask the nursery or buy plants in flower so you can pick both sexes.
Growing Coprosma in Containers
The compact cultivars of C. repens are excellent container plants, and this is worth covering separately because their needs shift in a few important ways compared to garden-grown specimens. Container plants dry out and run out of nutrients faster, and as noted in the nutrition research, leaf drop is triggered when nitrogen levels fall below a threshold that is easy to hit in a confined pot.5Scientia Horticulturae. Pre- and post-production characteristics of Coprosma as influenced by temperature, irradiance, and nutrient treatments
Use a free-draining potting mix, ideally one formulated for evergreen shrubs or general-purpose with added perlite. A pot with drainage holes is non-negotiable. Water when the top centimeter or so of mix feels dry; in hot weather this may be daily. Top-dress with slow-release fertilizer granules in spring and again in midsummer, or use a dilute liquid feed every couple of weeks through the growing season.
Container-grown Coprosma are also more vulnerable to cold because the root ball freezes faster in a pot than in the ground. In borderline climates, move containers to a sheltered spot against a house wall for winter, or wrap the pot in bubble wrap or hessian. Bringing the plant into an unheated greenhouse or conservatory during hard freezes is the safest option if you grow a tender cultivar.
Repot every two to three years in spring, stepping up one pot size. If the plant has reached the size you want, you can root-prune by trimming a few centimeters off the sides and bottom of the root ball and repotting into the same container with fresh mix. This keeps the plant healthy without it outgrowing its space.