Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata seeds - Japanese bitter orange
Poncirus trifoliata
Japanese Bitter-Orange, Trifoliate Orange
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This plant carries a 6 months recovery warranty
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We guarantee the quality of our plants for a full growing cycle, and will replace at our expense any plant that fails to recover under normal climatic and planting conditions.
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Description
Poncirus trifoliata, commonly known as the hardy orange or trifoliate orange, is an interesting citrus tree prized for its exceptional hardiness and garden utility. Native to East Asia, this deciduous bush stands out with its formidable large thorns and ornamental fruits. It is also valued for its lovely white spring flowering. It serves as a rootstock for other citrus trees to enhance their cold and disease resistance. In the garden, it can be used as a defensive hedge or as a standalone ornamental specimen, but planted away from pathways.
Belonging to the Rutaceae family, Poncirus trifoliata is sometimes classified under the Citrus genus due to its close relation to citrus trees. Native to northern regions of China and Korea, it has adapted to colder climates, making it unique among citrus trees. Its specific name "trifoliata" refers to its characteristic trifoliate leaves. This bush or small tree reaches a height of 2.5 to 5 m, with a spread of 1.5 to 4 m, depending on growing conditions. Its habit is dense and branching, with green branches adorned with strong thorns up to 4 cm long. The alternate and trifoliate leaves feature a central obovate to elliptical surface measuring 2.5 to 6 cm long, while the lateral leaflets are smaller. The white, solitary, and fragrant flowers (though slightly less so than other citrus trees) appear in spring, between April and May, before or during leaf emergence. They measure 3.5 to 5 cm in diameter and have five petals. The globose and hairy, 3.5 to 5 cm diameter fruits transition from green to yellow-orange when ripe in autumn. Though edible, they are very acidic and contain numerous seeds, making them less enjoyable fresh. However, they can be made into marmalade or used as a condiment once dried and powdered.
Poncirus trifoliata dislikes limestone but tolerates summer drought in deep soil. In the garden, this large bush is versatile. It works perfectly in an impenetrable defensive hedge. Planted alone, it is attractive in spring with its abundant flowering and in autumn with its golden fruits. You can pair it with bushes such as Berberis thunbergii 'Atropurpurea' for its purple foliage, Mahonia aquifolium for its evergreen leaves and yellow flowers, or Cornus alba 'Baton Rouge', which displays striking red stems in winter. These combinations create interesting contrasts in both colour and texture while ensuring an attractive structure year-round.
Poncirus trifoliata seeds - Japanese bitter orange in pictures
Flowering
Foliage
Plant habit
Botanical data
Poncirus
trifoliata
Rutaceae
Japanese Bitter-Orange, Trifoliate Orange
Citrus trifoliata, Poncirus polyandra, Aegle sepiaria, Pseudaegle sepiaria
China
Planting and care
Poncirus trifoliata seeds can be sown in spring, between March and May, when temperatures begin to warm up (15 to 25°C). If you have a controlled environment, such as a greenhouse or a well-lit indoor space, you can also sow in late winter (February-March) to give the young plants more time to develop before their first outdoor season. However, it is not advisable to sow in autumn or winter without protection, as the cold would significantly slow down germination.
To sow hardy orange seeds, start by soaking them in warm water for 24 hours to soften their coat and encourage germination. Then sow them in a light, well-draining substrate, made up of a mix of compost and sand, in individual pots or seed trays.
Place them in a bright location, at a temperature of 15 to 25°C, keeping the substrate slightly moist but not overly wet to avoid rot. Germination may take between 4 and 8 weeks. Once the young plants have developed 3 to 4 leaves, transplant them into larger pots. They should be kept in pots for about two to three years before planting out, to allow them to strengthen properly. When planting outdoors, choose a sunny spot with well-drained, non-calcareous soil, sheltered from cold winds.
Sowing period
Intended location
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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