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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

More information

The thorny orange bush is a deciduous bush known for its cold resistance down to -25°C. Its green, thorny branches display trifoliate leaves. In spring, this citrus produces fragrant white flowers, followed by small, sour yellow fruits in autumn. It adapts well to temperate climates and works wonders in defensive hedges. Its seeds are best sown in spring.
Flower size
3 cm
Height at maturity
4 m
Exposure
Sun
Germination time (days)
40 days
Sowing method
Sowing under cover, Sowing under cover with heat
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Sowing period February to May
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Flowering time April to May
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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.

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Citrus trees, orange trees and other citrus: how to plant and grow them in pots or in the garden?
Family sheet
by Alexandra 24 min.
Citrus trees, orange trees and other citrus: how to plant and grow them in pots or in the garden?
Read article

Poncirus trifoliata seeds - Japanese bitter orange in pictures

Poncirus trifoliata seeds - Japanese bitter orange (Flowering) Flowering
Poncirus trifoliata seeds - Japanese bitter orange (Harvest) Harvest

Flowering

Flower colour white
Flowering time April to May
Inflorescence Solitary
Flower size 3 cm
Fragrance Fragrant,
Bee-friendly Attracts pollinators

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased
Foliage description The foliage is slightly aromatic when crushed, releasing a scent reminiscent of citrus trees.

Plant habit

Height at maturity 4 m
Spread at maturity 3 m
Growth rate slow

Botanical data

Genus

Poncirus

Species

trifoliata

Family

Rutaceae

Other common names

Japanese Bitter-Orange, Trifoliate Orange

Botanical synonyms

Citrus trifoliata, Poncirus polyandra, Aegle sepiaria, Pseudaegle sepiaria

Origin

China

Product reference • 23989

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

Sowing period February to May
Sowing method Sowing under cover, Sowing under cover with heat
Germination time (days) 40 days

Intended location

Suitable for Meadow
Type of use Back of border, Free-standing, Hedge
Hardiness Hardy down to -23.5°C (USDA zone 6a) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Acidic, Neutral
Soil moisture Dry soil, Moist soil, well-draining, humus-bearing, deep

Planting & care advice

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