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Pittosporum crassifolium Pot Belly - Karo

Pittosporum crassifolium Pot Belly
Karo, caro

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This plant carries a 24 months recovery warranty

More information

A small evergreen shrub that naturally forms a dense ball and bears thick, greyish-green leaves with a silvery reverse. It reaches 1 m to 1.20 m in all directions and requires little pruning. It can be planted in the ground in mild climates, where it tolerates wind and sea spray very well. Elsewhere, grow it in a pot so it can be sheltered from the cold. Hardiness: -6/-8°C in well-drained soil.
Flower size
1 cm
Height at maturity
1.10 m
Spread at maturity
1.10 m
Exposure
Sun
Hardiness
Hardy down to -9.5°C
Soil moisture
Dry soil, Moist soil
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Best planting time March to April
Recommended planting time March to May, September to October
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Flowering time April to June
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Description

Pittosporum crassifolium ‘Pot Belly’ is an evergreen shrub for mild climates, notable for its naturally rounded habit and its thick, glaucous green foliage with a silvery reverse. Compact, well-branched and extremely resistant to wind and sea spray, it can be used in coastal areas or in a large pot on a sheltered terrace. Its small size and cushion-like silhouette are perfectly suited to low hedges, clipped balls in the style of boxwood, and foliage beds.

This pittosporum belongs to the Pittosporaceae family. The type species, Pittosporum crassifolium, called karo or thick-leaved pittosporum, is an evergreen shrub or small tree native to northern New Zealand and the Kermadec Islands. It lives on coastal cliffs and dunes or at the edge of the forest.
‘Pot Belly’ is a New Zealand horticultural selection of reduced size with a naturally rounded and dense habit. In the ground or in a large pot, it reaches 1 m to 1.20 m in height and 1 to 1.20 m in width after about ten years. Its growth is fairly rapid in mild climates. The short, numerous twigs bear thick evergreen, elliptical leaves, a few centimetres long, grey-green or medium green on top. Their felted, silvery-white reverse gives the vegetation a slightly silvery hue whenever the wind lifts the foliage. From April to June, small clusters of creamy to pale yellow campanulate flowers appear, discreetly scented and loved by insects. In mild climates, they can produce small round capsules that open at the end of the season to release black seeds surrounded by a resinous substance. The branched but not running root system anchors the plant firmly in light soils. This shrub is only hardy down to -6/-8°C in well-drained soil. Once well-established in the ground, it tolerates summer drought fairly well.
In New Zealand, the type species is often used for windbreak hedges and to stabilise dunes; the seeds were once used to prepare a dark dye.

In a coastal garden, Pittosporum crassifolium ‘Pot Belly’ can be placed at the front of a shrub bed or as a standalone specimen near a pathway. Several young plants aligned will create a low hedge that outlines a path or frames a terrace. Its ball-shaped habit contrasts with the large, colourful, ribbon-like leaves of Phormium Dark Delight®, or with the slender clumps of Cordyline australis ‘Red Star’. To evoke New Zealand landscapes, you can add a very sculptural Pseudopanax ferox, along with a few Leptospermum scoparium ‘Red Damask’; their bright red flowering will be enhanced by the silvery foliage of the pittosporum from spring to summer, both in the ground and on the terrace.

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Pittosporum: planting, growing and pruning
Family sheet
by Valérie 11 min.
Pittosporum: planting, growing and pruning
Read article

Pittosporum crassifolium Pot Belly - Karo in pictures

Pittosporum crassifolium Pot Belly - Karo (Foliage) Foliage
Pittosporum crassifolium Pot Belly - Karo (Plant habit) Plant habit

Plant habit

Height at maturity 1.10 m
Spread at maturity 1.10 m
Habit irregular, bushy
Growth rate normal

Flowering

Flower colour yellow
Flowering time April to June
Flower size 1 cm
Fragrance slightly scented
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Evergreen
Foliage colour medium green

Botanical data

Genus

Pittosporum

Species

crassifolium

Cultivar

Pot Belly

Family

Pittosporaceae

Other common names

Karo, caro

Botanical synonyms

Pittosporum crassifolium album, Pittosporum crassifolium var. strictum

Origin

Cultivar or hybrid, Oceania

Product reference25750

Planting and care

Plant Pittosporum crassifolium ‘Pot Belly’ in spring, in light to clay-sandy, well-drained soil, without stagnant water in winter. It tolerates ordinary soil, neutral to slightly lime-bearing, but dislikes very compact or waterlogged soils: in very clayey soil, improve drainage with coarse sand and fine gravel. Choose a position in full sun or light partial shade, sheltered from cold winds, especially outside coastal regions. Once well established, it withstands moderate summer drought, but requires consistent watering for the first two summers, and regular watering in pots. Its hardiness is around –6/–8 °C in dry soil and sheltered situations: mulch the base and, on young plants or in cold climates, protect with fleece in case of severe frost.

Planting period

Best planting time March to April
Recommended planting time March to May, September to October

Intended location

Suitable for Meadow
Type of use Border, Edge of border, Small gardens, Container, Hedge
Hardiness Hardy down to -9.5°C (USDA zone 8b) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil well-drained, light

Care

Pruning instructions A light pruning after flowering is sufficient to maintain a beautiful ball shape.
Pruning Pruning recommended once a year
Pruning time June to July
Soil moisture Dry soil, Moist soil
Disease resistance Good
Overwinter Needs protection

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