Plant Guide

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Evergreen tree

lagunaria-patersonii

Lagunaria patersonii

Norfolk Island hibiscus, pyramid tree, Queensland white oak, itch tree, cow itch tree

Australian, evergreen tree or shrub with a columnar to pyramidal shape, endemic to Lord Howe Island, Norfolk Island, and parts of Queensland. Oval, olive to grey green leaves, 5-10 cm long. Flowering in summer and early autumn with hibiscus-like, 4-8 cm wide flowers, pale pink, fading to white. Stamens are arranged in a single, central column, typical for members of the Malvaceae (mallow family). Flowers are followed by furry seed capsules, filled with tiny hairs which are like fiber-glass splinters and cause itching and skin inflammation. Lagunaria patersonii 'Royal Purple' has crimson flowers.

Prefers a sunny position in well-draining soil. Does not like wet feet. Not suitable for heavy clay soils. Can handle considerable drought and copes well in poor soils. Ideal for coastal gardens and windy locations. Tolerates light frosts. 

Versatile plant for flower display during late summer. Suitable for screening and hedging purposes. Tends to have branches and foliage all the way along the stem from ground level, but can be grown as a clear-stemmed specimen by regularly removing new growth from the main trunk. The canopy is relatively narrow, so even though Lagunaria patersonii can grow quite tall, it is suitable for smaller spaces. Plant this tree in areas where the seed pods cannot pose problems (i.e. away from pools and public spaces, in particular those frequented by children). 

laurus-nobilis-standard

Laurus nobilis

bay laurel, bay tree, sweet bay, true laurel

Evergreen broadly conical tree or large shrub from the Mediterranean region. Glossy, leathery leaves, highly aromatic when crushed and useful in cooking. Small, star-shaped yellowish flowers in spring, followed on female plants by green egg-shaped fruits that ripen to purplish black in autumn.

Prefers a sunny or part-shady position in well-drained soil. Leaves are darker green when grown in the shade. Remove any suckers that may be formed at the base of the plant. Hardy to -12oC. 

Laurus nobilis lends itself perfectly for clipping and shaping. It is a popular hedge and topiary plant. You can create your own topiary specimen by selecting a plant with a good, straight central leader (as opposed to a bushy plant that has its tip removed to encourage branching).  Gradually remove side branches that are forming too low on the main stem, untill the plant has reached the height from which you wish the canopy to be formed. Now allow the side branches to grow, and, once or twice a year, trim the canopy to a ball-shape or any other shape that takes your fancy.

metrosideros-excelsa

Metrosideros excelsa

pohutukawa, New Zealand pohutukawa, New Zealand Christmas tree

Evergreen, usually multi-stemmed tree, often developing a spreading canopy, endemic to New Zealand. Occurs mainly in coastal regions of the northern part of the North Island. Leaves of mature trees are covered with a fine tomentum, lightly on the upper surface and densely on the lower surface, giving the foliage a grey-green appearance. Leaves are elliptic to oblong, to 10 cm long and 5 cm wide, arranged in pairs. Bright red flowers begin to appear in November, and continue to open during December and January (New Zealand summer). Individual trees may vary in flowering time, and in flower colour shade and intensity. Flowers attract nectar-feeding birds. Grey, deeply furrowed bark. Metrosideros excelsa trees often develop clusters of aerial roots from the trunk and the lower branches, some of which may reach the ground.

Prefers a position in full sun and well-draining soil. Does not like wet feet. Very wind-tolerant. Good for coastal areas with poor soils. Tolerates dry conditions. Copes well with moderate frosts once established, but is frost tender when young. No major pests and diseases. Root system can become invasive, so it is best not to plant Metrosideros excelsa close to buildings or near drainage systems. Use drought-tolerant plants for under-planting.

Magnificent tree, smothered with flowers around Christmas time in the Southern Hemisphere. Use as a specimen tree in large gardens. If you have insufficient space, select one of the smaller growing selections, such as 'Scarlet Pimpernel' or 'Vibrance'.

michelia-doltsopa-silver-cloud

Michelia doltsopa 'Silver Cloud'

Small to medium, mostly evergreen tree with pyramidal canopy, long leathery leaves and masses of scented flowers in late winter and spring.  Dark green leaves, paler beneath, up to about 17 cm long. Leaves tend to hang. Floppy, multi-petalled creamy white magnolia-like flowers emerge from bronzy-brown, furry buds. In colder areas, Michelia doltsopa 'Silver Cloud' behaves like a semi-evergreen.

'Silver Cloud' was originally selected by Duncan and Davies in New Zealand. It has a smaller and neater growth habit than the parent species and flowers from a younger age (after 2-3 years). Michelia doltsopa itself originates from western China and eastern Himalayas.

Prefers a sheltered position in full sun and slightly acidic, well-draining soil. Keep roots cool and moist in summer. Requires little maintenance other than gradually removing the lower branches to lift the crown, and maybe some shaping of the canopy. Flowers may get damaged by frost.

nerium-oleander

Nerium oleander

Oleander

Evergreen shrub or small (usually multi-stemmed) tree, flowering in summer with 2.5-5 cm wide, white, pink, or reddish pink flowers in clusters at the end of the branches. Dark green, lanceolate to linear leaves, 5-20 cm long, 1 to 3 cm wide, arranged in twos or threes. Flowers may be, but are not always, scented. All parts of the plant are poisonous. Indigestion can be fatal. Contact with the flowers or foliage may cause severe allergic reactions, so wear long sleeves and gloves when handling Nerium oleander. Its native region stretches from the Mediterranean area to India and Southern China.

The common name alludes to its resemblance to the olive, Olea. Nerium oleander is the official flower of Hiroshima, being the first to flower after the atomic bombing of the city.

Easy to grow in just about any soil. Requires very little maintenance. Prefers a sunny position, but copes with partial shade. Established plants generally don't require fertilisation. Prune for shape in autumn. Can be pruned quite hard. Avoid touching the milky latex that exudes from the cut stems. Tolerates drought, coastal conditions, and moderate frosts (zones 8-11). Suitable for exposed sites, although strong winds may damage flower buds and open flowers. Yellowing of the leaves is usually a sign that the soil is too wet.

A magnificent sight when the plant is completely covered with flowers in summer. There are many cultivars available, with single or double flowers, and in a range of colours. In cold climates, Nerium oleander can be grown in a container and brought indoors for the winter.

olearia-paniculata

Olearia paniculata

akiraho

Evergreen shrub to 2-4 m tall or, when given sufficient space, a small tree to 6 m tall and 3 m wide, native to New Zealand. Light green, oval to oblong, leathery leaves, 3-10 cm long, 2-4 cm wide. Leaf margins are usually very wavy, but may be flat. Leaf undersides are covered with fine grey-white tomentum. Inconspicuous, creamy white, sweetly scented flower heads are produced in autumn. Occurs naturally in coastal areas, montane scrublands and forest margins of the North and South Islands of New Zealand.

Prefers a sunny or partially shaded position in well-draining soil. Tolerates moderate frosts, and dry, windy, and coastal conditions. Frost hardy throughout New Zealand. Responds well to trimming.

Excellent hedge or screen for coastal sites. Attractive foliage plant with an interesting texture and bright green colour.

pittosporum-crassifolium

Pittosporum crassifolium

karo

New Zealand native evergreen shrub or small tree. Thick, leathery, obovate leaves with rolled down margins, about 6 cm long and 2 cm wide. The leaf undersides and petioles are covered with a dense whitish tomentum. Deep red, fragrant, unisexual flowers in spring, the female ones turning into three- or four-valved seed capsules which eventually split open to reveal shiny black seeds. Provides food for native and exotic birds. Originally occurred naturally near the coast, along streams and in forest margins in the North Island of New Zealand from the North Cape to Poverty Bay, and in the Kermadic Islands. Karo is now naturalised throughout most of New Zealand.

Prefers a sunny or semi-shady position in free-draining soil. Tolerates wind, coastal conditions, relatively dry sites, and moderate frosts (zones 9-11). Usually quite fast growing and problem-free. Prune yearly. Benefits from mulch and compost.

Tough plant with a grey-green overall appearance. Suitable for hedging purposes. The flowers release a delightful scent at night. Excellent choice for seaside gardens as a filler or background plant.

pittosporum-eugenioides-variegatum

Pittosporum eugenioides 'Variegatum'

variegated tarata, variegated lemonwood

Bushy evergreen tree or shrub with variegated foliage. The leaves are 10-15 cm long, 2-4 cm wide, mid green, blotched along the wavy margins with creamy white. Foliage emits a lemon-like scent when crushed, hence the common name. Terminal clusters of honey-scented, 1-1.5 cm wide, pale yellow flowers during spring.

Pittosporum eugenioides is native to New Zealand where it occurs throughout the country along stream banks, forest margins and in forest clearings from sea level to about 600 m. The variegated form grows a bit slower than the species itself. It has a tapering habit when young, filling out to an open topped tree later on. 

Prefers a sunny or partially shaded position in any well-draining soil. Is more tolerant of damp and heavy soils than most other Pittosporum species, but growth will be compromised. Tolerates coastal conditions, moderately strong winds, and medium frosts.

Suitable for hedging or screening purposes. Good contrasting plant in mixed plantings. Also ideal as a specimen tree in particular when pruned to show off the pale grey bark.

Foliage is often used in floral arrangements.

pittosporum-tenuifolium-silver-sheen

Pittosporum tenuifolium 'Silver Sheen'

Cultivar of the New Zealand native Pittosporum tenuifolium (kohuhu) with dainty foliage and black branches. Fast growing evergreen shrub or small tree. Tiny leaves with a silvery-grey sheen, round initially and gradually becoming oval in shape.

Prefers a position in full sun. Growth is a bit more open in partial shade. Grows well in any well-drained soil other than heavy clay. Reasonably drought tolerant. Avoid wet sites. Frost-hardy throughout New Zealand, and in general tolerates moderate frosts. Fertilise with general purpose fertiliser in spring and autumn. Responds well to trimming.

Attractive plant with delicate foliage and lovely colour contrasts of silver leaves and black branches. Great choice for hedging purposes. If you wish to grow Pittosporum tenuifolium 'Silver Sheen' as a specimen, plant it where you can see the leaves shimmer in the sun. Cut branchlets are suitable for floral art.

pittosporum-tenuifolium-variegatum

Pittosporum tenuifolium 'Variegatum'

variegated kohuhu, variegated tawhiwhi

Evergreen shrub or small tree with variegated foliage, native to New Zealand. Leaves are flat (as opposed to wavy like the species itself), greyish green with white margins, similar to Pittosporum tenuifolium 'Argenteum Variegatum' but larger and more pointed, to about 5 cm long. Small (to 1 cm wide) dark reddish-black, honey-scented fowers with reflexed petals in spring. Dark grey bark.

Prefers a sunny or semi-shaded position in any, well-draining soil. Tolerates medium frosts and is frost hardy throughout New Zealand. Pittosporum tenuifolium is not as tolerant as Pittosporum crassifolium of coastal conditions and strong winds, but copes reasonably well with dry conditions. Tends to loose its leaves if conditions are too wet.

Ideal as a specimen tree for foliage colour, or as a hedge or screening plant.

podocarpus-totara-aurea

Podocarpus totara 'Aurea'

golden totara

Golden-leafed cultivar of Podocarpus totara, a New Zealand native conifer. Pyramidal to columnar growth habit. The needle-like leaves are linear, sessile, 1-3 cm long, 2-4 mm wide. Leaf colour varies somewhat during the year from light green in spring, changing to yellow in summer, and deepening to golden yellow in winter.

Plant in full sun for best foliage colour. Prefers well-draining soil. Tolerates dry conditions once established. Responds well to trimming and is suitable for hedging purposes. Tends to have a bushy habit with foliage from ground level, but can be trained to grow as a specimen tree from an early age by selecting one shoot to become the central leader and gradually removing the side shoots. Make sure to stake the tree when planting in an exposed position. Suitable for coastal gardens.Tolerates moderate frosts, and is hardy throughout New Zealand.

Smaller and slower growing than the species itself, Podocarpus totara 'Aurea' can be accomodated in garden settings for many years. Forms a nice dense hedge.

psoralea-pinnata

Psoralea pinnata

Dally pine, blue Psoralea, African scurf pea, blue pea, fountain bush, blue broom, taylorina, fonteinbos, penwortel

Evergreen shrub or small tree in the legume family, with bright green, soft, needle-like leaves. Flowering in early spring with blue and white or lilac and white, pea-like, bee-attracting, scented flowers (to 1.5 cm across) clustered at the ends of the branches. The flowers are followed by small, wrinkled seedpods that each contain a seed. Psoralea pinnata is native to South Africa where it occurs naturally along streams and wet places (i.e. winter-wet areas). It has established itself in other regions of the world such as Southern Australia and the north of New Zealand where it is regarded as a weed. Psoralea pinnata tolerates a wide range of growing conditions, including wind, drought, high rainfall, coastal conditions, and poor soils. Because it is a nitrogen-fixer, it changes the growing environment for the original native plant species that may no longer be able to compete as a result. Germination is stimulated by fire. The pant is relatively short-lived (about 10 years).

Psoralea pinnata prefers a sunny position, except in areas with very high summer temperatures where a partially shaded site is better. Tolerates waterlogged soils, but also copes with occasional drought once estabished. Prune after flowering. Self-seeds quite easily. Tolerates light to moderate frosts (zones 9-11).

Striking tree when in flower. You may need to give it some help in the form of pruning and training to develop a good shape as it does not appear to do so naturally and often has a somewhat straggly, unbalanced appearance.