Pittosporum tenuifolium 'Silver Ball' (Kohuhu)
Hardy Evergreen Shrub with Stunning Silvery Foliage and Perfect Spherical Form
Create luminous garden elegance with Pittosporum tenuifolium 'Silver Ball', an exceptional evergreen shrub that delivers outstanding year-round visual impact through its stunning silvery-grey foliage and naturally perfect spherical growth habit. This remarkable cultivar combines the architectural precision of naturally formed topiary with distinctive silvery leaf colouration that creates bright focal points and sophisticated colour contrast throughout all seasons. The naturally compact ball-shaped form and eye-catching silvery foliage make it ideal for formal gardens, container displays, coastal plantings, and contemporary landscape designs where both structure and distinctive colour are essential.
Key Features
- Plant Type: Hardy evergreen shrub
- Height: 1.2m
- Spread: 1.2m
- Flowering Period: May to June (small fragrant flowers)
- Flower Colour: Small creamy-white fragrant flowers
- Foliage: Distinctive silvery-grey small oval leaves with wavy edges
- Hardiness: Hardy in the UK down to temperatures of -10 to -5 degrees Celcius (RHS hardiness rating H4)
- Growth Habit: Naturally spherical, compact, slow-growing, perfectly rounded
Stunning Silvery Foliage Display
The crown jewel of Pittosporum tenuifolium 'Silver Ball' is its breathtaking silvery-grey foliage that creates luminous highlights and sophisticated colour contrast throughout the year. Each small oval leaf displays a distinctive silvery-grey colouration that catches and reflects light beautifully, creating an almost metallic sheen that brightens garden areas and adds contemporary elegance to plantings. The wavy-edged leaves add subtle textural interest whilst the unique silvery colour creates dramatic contrast against darker greens and provides essential light relief in garden compositions.
Perfect Natural Spherical Form
The outstanding architectural feature of this cultivar lies in its naturally perfect spherical growth habit that creates instant topiary effects without any pruning or training. The dense, compact branching pattern naturally forms an almost perfect ball shape that maintains its precise form year-round, making it invaluable for gardeners seeking instant structural impact with minimal maintenance requirements. The naturally neat habit eliminates the need for skilled topiary work whilst providing the sophisticated geometric form that contemporary garden designs demand.
Outstanding Light-Reflecting Properties
This exceptional cultivar provides unmatched ability to brighten garden areas through its silvery foliage that reflects and amplifies available light, making it particularly valuable for creating highlights in shaded areas and adding luminosity to garden compositions. The silvery-grey colour creates sophisticated contrast against traditional green foliage whilst the light-reflecting properties make it ideal for illuminating darker corners and creating focal points that draw the eye through garden spaces.
Exceptional Contemporary Appeal
The combination of perfect spherical form and distinctive silvery foliage creates exceptional value for contemporary garden designs where geometric shapes and sophisticated colour palettes are essential. The naturally precise form and unique colouration make it perfect for modern landscape schemes, architectural gardens, and minimalist designs where bold sculptural elements are required to create visual impact and structural interest.
Premium Coastal Performance
The silvery foliage and naturally compact habit provide excellent coastal tolerance, making this cultivar invaluable for seaside gardens where the distinctive colouration complements coastal landscapes whilst withstanding salt spray and coastal conditions. The light-reflecting properties of the silvery leaves create beautiful effects in coastal light whilst the wind-resistant spherical form ensures reliable performance in exposed positions.
Growing Requirements
-
Soil and Position: Thrives in well-drained soil conditions and tolerates a wide range of soil types from sandy to clay, providing drainage is adequate. Prefers full sun to partial shade where the silvery foliage appears most luminous and the distinctive colouration develops its best intensity. Excellent coastal tolerance makes it outstanding for seaside gardens, whilst good urban pollution tolerance ensures reliable performance in city conditions.
-
Light Requirements: Performs best in full sun to partial shade where the silvery-grey colouration appears most distinctive and the light-reflecting properties are most pronounced. The natural spherical form develops most perfectly in good light conditions, though some shade is tolerated with slightly reduced colour intensity.
-
Soil Preferences: Adaptable to most soil types providing drainage is adequate. Tolerates both acid and alkaline conditions, making it suitable for a wide range of garden situations. Once established, demonstrates excellent drought tolerance, though benefits from watering during extended dry periods for optimal foliage condition and colour development.
Care and Maintenance
-
Pruning Requirements: Minimal pruning required due to naturally perfect spherical form and slow growth rate. Light trimming in late spring if minor shape refinement is needed, though the natural form is usually perfect without intervention. Avoid heavy pruning which can spoil the natural spherical shape and may encourage uneven regrowth that compromises the architectural form.
-
Watering Requirements: Water regularly during establishment to develop a strong root system and support healthy foliage development. Once established, demonstrates excellent drought tolerance though benefits from watering during extended dry periods to maintain optimal silvery foliage condition and colour intensity. Container specimens require more regular watering, particularly during summer months.
-
Fertilising Programme: Apply a balanced general-purpose fertiliser in spring to support healthy growth and maintain vibrant silvery foliage colour. Avoid high-nitrogen fertilisers which may encourage loose growth that spoils the compact spherical form. Benefits from annual mulching to conserve moisture and suppress weeds around the naturally compact root zone.
Design Applications
-
Contemporary Gardens: Outstanding for creating geometric structure and sophisticated colour contrast in modern garden designs. The perfect spherical form and silvery foliage create bold architectural statements that work beautifully in minimalist landscapes, contemporary courtyards, and urban garden settings where sculptural elements are essential.
-
Container Plantings: Ideal for containers where it provides year-round structure with distinctive silvery highlights. The compact size and perfect spherical form make it exceptional for creating focal points in patio gardens, flanking entrances, or defining outdoor living spaces. The silvery foliage creates sophisticated container displays that work beautifully in contemporary settings.
-
Formal Gardens: Perfect for creating instant topiary effects and geometric structure in formal garden schemes. Use individually as specimen plants, in groups for rhythmic plantings, or in rows for formal edging. The naturally perfect form eliminates the need for skilled topiary maintenance whilst providing the structured appearance that formal designs require.
-
Coastal Gardens: Exceptional for seaside gardens where the excellent salt tolerance and distinctive silvery colouration complement coastal landscapes. The light-reflecting properties work beautifully in coastal light whilst the compact spherical form provides wind resistance and structural interest in exposed positions.
Seasonal Interest
-
Spring Luminosity: Provides essential garden framework during spring with the perfect spherical form and bright silvery foliage creating immediate structural impact that anchors emerging plantings. The silvery colouration appears particularly luminous in spring light whilst complementing the fresh greens of spring growth and early flowering bulbs.
-
Summer Brilliance: Maintains consistent silvery foliage quality and perfect spherical form throughout summer, providing reliable evergreen structure and continuous colour contrast that creates sophisticated backdrop for summer plantings. The light-reflecting properties continue to brighten garden areas whilst the geometric form provides essential architectural interest.
-
Autumn Contrast: Provides essential structure and distinctive colour contrast whilst many other plants fade, with the silvery foliage maintaining its attractive appearance and light-reflecting properties. The evergreen spherical presence becomes particularly valuable as deciduous plants lose their leaves and the silvery highlights provide continued visual interest.
-
Winter Architecture: The perfect spherical evergreen structure provides essential winter interest and garden framework, with the silvery foliage creating bright highlights against winter landscapes. The geometric form becomes particularly architectural during the dormant season whilst the distinctive colouration adds sophistication and light relief to cold-weather displays.
Hardiness and Reliability
Hardy in most UK locations with good cold tolerance and dependable garden performance. The silvery foliage maintains its attractive colouration throughout winter, making this cultivar particularly valuable for year-round colour contrast. Young plants establish well and demonstrate excellent resilience once established, with the reliable growth habit ensuring consistent spherical form and silvery displays year after year.
Why Choose Pittosporum tenuifolium 'Silver Ball'?
This exceptional evergreen shrub represents the perfect combination of naturally perfect spherical form, stunning silvery foliage, and ultra-low maintenance requirements. The distinctive silvery-grey colouration creates sophisticated colour contrast and light-reflecting properties that brighten garden areas, whilst the naturally perfect ball shape provides instant topiary effects without any pruning skills or ongoing maintenance. The reliable performance and naturally neat habit make it ideal for gardeners seeking premium structural plants with distinctive colour impact.
Whether used in contemporary gardens, container displays, or formal landscape schemes, Pittosporum tenuifolium 'Silver Ball' offers exceptional value for gardeners seeking a plant that combines perfect natural architecture with distinctive silvery foliage. This outstanding shrub provides the perfect balance of geometric form, sophisticated colour, and garden dependability that makes it an essential addition to any garden scheme seeking year-round structural impact with contemporary appeal.
Buying Shrubs from Jacksons Nurseries
At Jacksons Nurseries we sell a variety of shrubs both evergreen and deciduous with a variety of flowering times throughout the year. At certain times of the year our shrubs you buy from us may not look like the images shown on our website when deciduous leaves have fallen, the shrub has finished flowering or has been trimmed back.
Some leaves on evergreen shrubs can be damaged in winter by frost or harsh winds but in spring new leaves will readily replace those damaged. This is quite normal on many evergreen varieties and is preferable to plants grown with excessive protection that show cold shock once planted out and establish less satisfactory initially.
Availability: Stock availability figures are provided as a guide only. There is a delay between orders being placed and the plants being gathered by our pulling team. During this time it may be possible for a member of the public to purchase these plants from our Garden Centre, while this is rare it is a possibility and we will notify you of any problems as soon as possible. This figure may also include plants that have not yet be flagged as unsaleable.
Pre-order: Pre-order times are given as a guide only and may vary dependent on the growing season. Orders containing Pre-ordered products will be shipped as a single order when all items become available. Large orders may be part shipped, please contact us on 01782 502741 or email sales@jacksonsnurseries.co.uk.
* Please Note: Shrubs in 20 litre pots and above might require a pallet delivery starting at £79.99 per pallet. Depending on the exact pot size and height it may be possible to get approximately 5 plants per pallet at no extra cost. The maximum height we can dispatch on a pallet is 2.0m, this includes the height of the pallet and pot.
Shrubs are deciduous or evergreen woody plants, and often provide fragrant flowers, berries and foliage. They are good for structural framework, and they can provide a wonderful shelter and food source for wildlife.
Planting and Conditions
Container grown shrubs can be grown at any time of year. It is a little known fact that shrubs planted in the autumn and winter will be easier to look after than those planted in the spring and summer, because they will have time to establish and become hardy in the cooler months.
Plant the shrub at the same depth as it was in its original pot. Planting too deeply can result in root and stem rot.
One of the biggest causes of death in new shrubs is drought stress, so keep it well watered until it’s established.
Make sure you loosen the soil prior to planting. Most shrubs are tolerant of most soil types as long as it is fairly well draining.
Most shrubs will grow happily in containers, but they will be much more demanding on feeding and watering than shrubs in the ground would be. They will also need potting on every couple of years so that they don’t suffocate or become stunted in their pot.
Aftercare and Pruning
Once established, shrubs generally do not require much water. However, at first they need careful, frequent watering and should not be left to dry out.
Shrubs in the ground are generally not demanding and in most cases, annual feeding with general purpose fertilizer will suffice. Shrubs in containers may need more feeding; usually from early spring until late summer.
Shrubs also benefit from mulching in order to supress weeds, conserve moisture and provide vital nutrients. Mulch also greatly improves soil conditions. Shrubs can be mulched in late winter, after fertiliser has been applied, but it can be mulched through autumn to late spring as long as the ground is damp.
All shrubs benefit from dead-heading once spent flowers become apparent. Rhododendrons and Lilac especially benefit from the removal of dead flowers.
Some shrubs may show signs of reverted growth or ‘sporting’. This is where random shoots of different leaves associated with the plant’s parentage begin to appear. Most commonly this is where plants with variegated leaves sprout pure green growths instead of variegated ones.
To control reversion, remove reverted shoots promptly to discourage them. Reverted shoots are usually much more vigorous than the variegated ones, and thus should be completely pruned out and cut back into wood containing variegated foliage.
Potential Issues
Although shrubs are usually very robust garden plants, they can sometimes start to decline with no apparent or obvious reason.
This will start with browning leaves, which could indicate plant stress due to lack of water or waterlogging, an establishment failure or, in the worst case scenario, honey fungus. Another cause of leaf browning is a high salt content in the soil. This could be a natural occurrence, especially if you live near the ocean, or it could be from over fertilisation.
To remedy a high salt content, cut back on fertiliser and step up your watering regime for the next few weeks. If you live by the ocean, this will be harder to remedy—but stepping up your watering will help to wash some of the salt away all the same.
No posts found