Quercus ilicifolia Tromp Ball - Bear Oak
Quercus ilicifolia Tromp Ball - Bear Oak
Quercus ilicifolia Tromp Ball
Bear Oak
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Description
Quercus ilicifolia 'Tromp Ball' is a variety of holly-leaved oak characterised by a bushy and rounded habit. Grafted on a stem, it forms a unique small tree with a globular and irregular crown. This variety has ornamental deciduous foliage, reminiscent of holly leaves, but turns a beautiful red in autumn. Its size makes it suitable for gardens of all sizes. While not demanding, this oak prefers well-drained, slightly acidic soils that are not too dry.
Quercus ilicifolia 'Tromp Ball' (also known as Quercus ilicifolia 'Nana') was selected at the Trompenburg Arboretum in the Netherlands and described in 2001. It is derived from the holly-leaved oak (Quercus ilicifolia), a species native to the eastern United States, introduced to Europe in 1800. All oaks belong to the Fagaceae family.
'Tromp Ball' naturally forms a bush that can reach 2 to 4 metres in height and width. Its habit is rounded, irregular, but well-branched. Its shoots are grey-brown with silver buds. Its foliage is deciduous, developing in spring and falling in autumn. The leaves are generally rectangular, ovate, or obovate, measuring 5 to 10 cm long and 3 to 5 cm wide, with 5 to 7 small lobes. Each lobe ends in a thorn, which is the tip of a vein. The leaf blade is leathery, dark green and shiny on the upper side, grey-green or whitish-green on the underside. In autumn, the leaves turn red, a colouration that will be more pronounced in suitable climates and soils. This oak blooms in May, bearing male flowers in catkins and female flowers in clusters. This flowering, which attracts pollinators, has no decorative value. The fruits are oval acorns, pointed at the top, measuring between 1 and 1.6 cm in diameter and 1 cm long. Each acorn is inserted into a grey or olive-brown cup cup that covers nearly half of the fruit. The acorns mature in the second year after flowering.
When grafted on a stem, Quercus ilicifolia 'Tromp Ball' can be planted as a specimen tree on a lawn or in the centre of a bed of ground cover perennials, for example. It can also be planted alongside low-growing shrubs chosen for their flowering or autumn colours. It will pair well with dwarf barberries or dwarf conifers, for instance. In any case, it deserves to be closely observed.
Plant habit
Flowering
Foliage
Planting and care
The hardy, holly-leaved oak 'Tromp Ball' thrives in permeable, light soils, preferably slightly acidic or neutral. A slightly chalky soil is tolerated. It requires soil that remains somewhat moist, even in summer, but not waterlogged. Place a sturdy stake to help it establish, water during the first few months and in particularly dry summers. Organic mulching can help keep the soil slightly moist near its base, to limit watering.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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