Kohuhu Pittosporum tenuifolium 'Irene Paterson' (m/v)
ABOUT
The plant known as Irene Paterson is a variety of Pittosporum with a distinctive appearance. It features variegated leaves that are primarily cream or white, beautifully contrasted with irregular splotches and margins of light green to grayish-green. Over time, the leaves may mature to a more solid green color, but the younger foliage will often display more of the striking variegation that makes this plant attractive. The leaves themselves are small and wavy with a delicate, somewhat glossy texture that glistens in the sunlight. Irene Paterson carries small, unobtrusive flowers which may be hard to spot against the brightly variegated leaves. The flowers are typically honey-scented, adding a sweet fragrance when they bloom, which can be an added delight in the garden. The overall appearance of this plant is one of elegance and sophistication, with its gentle leaf variegation offering a pleasing aesthetic that stands out in garden landscapes or when used as a decorative shrub in various garden settings.
About this plant
NamesFamily
Pittosporaceae.
Synonyms
Tawhiwhi 'Irene Paterson', Kohuhu 'Irene Paterson', Variegated Pittosporum 'Irene Paterson', Variegated Kohuhu 'Irene Paterson', Variegated Tawhiwhi 'Irene Paterson'.
Common names
Pittosporum tenuifolium 'Irene Paterson'
ToxicityTo humans
Pittosporum, also known as Kohuhu, 'Irene Paterson,' is considered to be mildly toxic to humans if ingested. However, poisoning is not common and typically occurs only if large quantities of the plant parts are consumed. The toxicity is due to saponins and other potentially toxic compounds found in various parts of the plant. If ingested, the symptoms can include gastrointestinal upset, such as nausea, vomiting, and diarrhea. In rare cases, more severe symptoms could occur. It is advisable to seek medical attention if someone has consumed a significant amount of the plant and is experiencing adverse symptoms.
To pets
Pittosporum, commonly known as Kohuhu, 'Irene Paterson,' is also mildly toxic to pets, including dogs and cats, if ingested. The toxicity arises due to saponins and other chemical compounds that can cause gastrointestinal upset in pets. Symptoms of poisoning may include vomiting, diarrhea, and drooling. While it is not generally considered lethal, ingestion of large quantities could lead to more severe symptoms, and veterinary attention should be sought if a pet is exhibiting signs of distress after consuming parts of the plant.
CharacteristicsLife cycle
Perennials
Foliage type
Evergreen
Color of leaves
Variegated
Height
8-10 feet (2.4-3 meters)
Spread
5-6 feet (1.5-1.8 meters)
Plant type
Shrub
Hardiness zones
8
Native area
New Zealand
Benefits
General Benefits- Aesthetic Appeal: Pittosporum tenuifolium 'Irene Paterson' (commonly known as Kohuhu) offers a striking variegated foliage that can add visual interest to any garden.
- Privacy Screen: Kohuhu can be used to create dense hedges or privacy screens due to its bushy growing habit.
- Low Maintenance: Once established, it requires minimal care, making it a convenient choice for gardeners of all skill levels.
- Versatility: This shrub is suitable for a variety of garden styles and can be planted in beds, borders, or containers.
- Tolerates Conditions: It's adaptable to a range of soil types and can tolerate windy and coastal conditions, where other plants might struggle.
- Wildlife Friendly: The dense foliage provides shelter for birds, and the flowers can attract beneficial insects such as bees.
- Evergreen: As an evergreen plant, Kohuhu provides year-round interest and foliage in the garden.
Medical PropertiesThis plant is not used for medical purposes.
Air-purifying QualitiesThis plant is not specifically known for air purifying qualities.
Other Uses- Pittosporum tenuifolium 'Irene Paterson' can be used in floral arrangements to add a touch of variegation and texture with its attractive foliage.
- It may serve as a natural screen or privacy hedge in gardens, given its dense growth habit.
- The wood of 'Irene Paterson' can be used in small woodworking projects, as it is dense and can take on a fine polish.
- This plant can be used as a backdrop plant in mixed shrub borders to highlight its contrasting foliage against green-leaved plants.
- It can be planted in large containers as a decorative patio plant because of its manageable size and ornamental leaves.
- 'Irene Paterson' can be used in creating themed gardens, like white gardens, due to its cream-edged foliage.
- The contrasting foliage provides a stunning visual when planted along walkways or as part of knot gardens.
- It may be used to emphasize an area in a garden due to its unique leaf pattern drawing the eye.
- This variety of Pittosporum can be used as a foil for more vividly colored plants in garden design, allowing their colors to stand out more intensely.
- The bark and branches can be used in terrariums or as a component in natural arts and crafts for textural interest.
Interesting Facts
Feng ShuiThe Pittosporum is not used in Feng Shui practice.
Zodiac Sign CompitabilityThe Pittosporum is not used in astrology practice.
Plant Symbolism- Versatility: Irene Paterson’s Pittosporum's ability to thrive in various conditions and its use in different landscape designs symbolize versatility and adaptability.
- Protection: In some cultures, Pittosporum species are believed to offer protection, hence planting it around homes was thought to ward off evil spirits.
- Longevity: With its potential to live for many years, Pittosporum represents endurance and long-lasting presence.
- Peace: The lush greenery and dense foliage of the plant can evoke a sense of tranquility and calm, making it a symbol of peace.
WaterThe Mock Orange should be watered thoroughly, allowing the soil to dry out slightly between waterings. Generally, this means watering once a week, but frequency should be increased during hot, dry periods and reduced during cooler, wet months. A good practice is to provide the plant with about 1-2 gallons of water each time for a medium-sized shrub, ensuring it reaches the roots but does not leave the soil waterlogged.
LightMock Orange thrives in a spot with full sun to partial shade. It benefits from at least six hours of sunlight per day but can also tolerate some shade, especially in areas with very hot afternoon sun. A location that receives morning sunlight and some afternoon dappled shade is ideal.
TemperatureMock Orange prefers temperate climates and is hardy in a range from about 20°F to 100°F. The ideal temperature range for this plant is between 60°F and 75°F. It can survive light frosts but needs protection or proper siting to avoid damage from extreme cold.
PruningPrune the Mock Orange to maintain its shape and encourage bushier growth. Pruning is best done in late winter or early spring before new growth begins. Annually removing some of the older branches after the plant has flowered will help promote healthy growth and improve air circulation.
CleaningAs needed
SoilKohuhu prefers well-draining soil with high organic content; mix equal parts loam, peat, and sharp sand. Ideally, maintain soil pH between 5.5 and 7.0.
RepottingKohuhu should be repotted every 2-3 years, or when it outgrows its current pot, to ensure continued growth and health.
Humidity & MistingKohuhu thrives in moderate to high humidity levels, ideally around 40-50%, which mimics its natural coastal habitat.
Suitable locationsIndoor
Ensure bright, indirect light and maintain moderate humidity.
Outdoor
Place in partial shade, shelter from strong winds, mulch soil.
Hardiness zone
8-10 USDA
Life cyclePittosporum tenuifolium 'Irene Paterson', commonly known as Kohuhu or Tawhiwhi 'Irene Paterson', begins its life cycle as a seed, often germinating in spring when soil temperatures are warm and conditions are moist. Upon germination, the seedling emerges, initially developing a basic root system and a pair of seed leaves (cotyledons) before growing its true leaves. As the plant grows, it develops a woody stem and a dense, bushy habit with variegated leaves that are green with white margins, which can mature to a cream color with green blotches. Kohuhu 'Irene Paterson' reaches maturity in several years, where it can produce small, fragrant, purple flowers, typically appearing in late spring or early summer. After pollination, usually by insects, the plant produces small, woody capsules containing seeds, which dry and split to release seeds for dispersal. The plant continues this cycle of growth, flowering, and seed production for several decades, as it is an evergreen shrub with a relatively long life span in ideal conditions.
PropogationPropogation time
Spring-Early Summer
Pittosporum tenuifolium 'Irene Paterson', commonly known as Tawhiwhi 'Irene Paterson', is typically propagated through semi-hardwood cuttings. The most popular method involves selecting healthy, semi-hardwood stems from the current or previous year's growth during late summer to early fall. The cuttings, usually about 4 to 6 inches (10 to 15 centimeters) long, should have a few leaves left at the top after removing the lower foliage. It's beneficial to dip the cut end into rooting hormone powder to increase the chances of successful rooting. Then, the cuttings are placed in a well-draining potting mix and kept in a warm, humid environment with indirect light. It may take several weeks to a few months for the cuttings to root, after which they can be transplanted into individual pots and eventually into the garden.
