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Mahonia oiwakensis subsp. lomariifolia

Mahonia oiwakensis subsp. lomariifolia
Lomaria-leaved Mahonia

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More information

Graden Merit
Beautiful bush with an exotic appearance. It is one of the parents of the famous Mahonia x media 'Charity'. Relatively hardy and accommodating, it blooms over a beautiful period in the heart of winter, in long panicles of bright yellow flowers with a honey scent. Its long evergreen and glossy leaves, divided into narrow prickly leaflets, give the plant a remarkably sculptural look throughout the year, in the semi-shaded areas of the garden.
Flower size
20 cm
Height at maturity
3 m
Spread at maturity
3 m
Exposure
Partial shade, Shade
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to March, September to November
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Flowering time January, November to December
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Description

Mahonia oiwakensis subsp. lomariifolia, often simply called Mahonia lomariifolia, may be the most elegant and sculptural of all mahonias. While it is remarkable in winter with its long, fragrant, golden flowering, this large bush also has a very distinctive habit that gives it an exotic and beautiful appearance throughout the year. Its long, evergreen, and glossy leaves, deeply divided into narrow, spiny leaflets, are reminiscent of the fronds of a tree fern. This highly structured plant will bring a touch of exoticism to any setting.

 

Mahonia lomariifolia belongs to the Berberidaceae family. It is a hardy species (-15°C (5°F) at least) and not very water-demanding, native to China. Its ease of cultivation and ornamental qualities have earned it recognition from the Royal Horticultural Society. This rhizomatous bush reaches a height of about 3m (10ft), slightly less in width. Its growth rate is slow during the early years but then accelerates. Growing on multiple trunks that tend to become bare over time, this mahonia has an erect, gracefully spreading habit supported by sparsely-branched stems. The evergreen foliage is composed of long leaves arranged in rosettes at the end of the stems. Reaching a length of 50cm (20in), they are divided into 10 to 20 pairs of leaflets arranged in an opposite manner along the central vein, on an almost horizontal plane. Each leaflet, lanceolate in shape, has a leathery texture and a spiny, undulate margin. The colour of the young spring foliage is purplish green, becoming dark green in summer with a yellow-green underside. The flowering, long in the heart of winter, extends from late autumn (December) to the middle of winter (January-February). The inflorescences are erect to slightly arched, arranged in rosettes at the end of the young stems. These clusters, measuring 10 to 25cm (4 to 10in), are composed of numerous small, yellow, bell-shaped and nectar-rich flowers. Their fragrance is somewhat reminiscent of lily-of-the-valley, but lighter. They give way to small, decorative blue berries covered with bloom. They are weakly toxic to humans, but appreciated by birds.

 

Flowering in the heart of winter, with long yellow panicles, the mahonia becomes the focal point in the garden when other plants are dormant. For gardeners in cold regions, it can replace the southern mimosa, to some extent, both in the garden and in bouquets. Its unique, sculptural, and highly structured habit will transform a border or a large shaded rockery. For example, plant it with ferns and the blue flowers of liverworts or bluebells in cool, shaded areas. To conceal the somewhat bare base of the bush, consider perennial geraniums, autumn daisies, or wall germander (Teucrium chamaedrys), which are evergreen and truly undemanding. A group of 3 subjects placed in a triangle will create a quite spectacular grove. If placed at the corner of a patio or porch, it will perfume the air and bring colour close to the house during the dreary days of winter. Gardeners can welcome it in a large container on a patio or balcony, for example, along with dwarf bamboos. This mahonia can also be included in a mixed hedge, with other evergreen shrubs.

Mahonia oiwakensis subsp. lomariifolia in pictures

Mahonia oiwakensis subsp. lomariifolia (Flowering) Flowering
Mahonia oiwakensis subsp. lomariifolia (Foliage) Foliage
Mahonia oiwakensis subsp. lomariifolia (Plant habit) Plant habit

Plant habit

Height at maturity 3 m
Spread at maturity 3 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour yellow
Flowering time January, November to December
Inflorescence Cluster
Flower size 20 cm
Fragrance slightly scented, gentle scent of lily-of-the-valley.
Bee-friendly Attracts pollinators
Fruit colour blue

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Mahonia

Species

oiwakensis subsp. lomariifolia

Family

Berberidaceae

Other common names

Lomaria-leaved Mahonia

Origin

China

Product reference871431

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Planting and care

Plant ideally in a semi-shaded or shaded position (it tolerates morning sun), in deep and moist soil. It is tolerant of soil types, but it prefers a rather rich and well-drained one. It can tolerate the presence of limestone and rocks in the soil. Once established, this bush proves to be tolerant of summer drought. This mahonia is hardy (-15°C (5°F)) once mature, but young plants can be damaged or even destroyed by severe frost. Therefore, choose a location protected from prevailing winds and drafts if you live in a very cold region. In hot and dry regions during summer, it will adapt but will never reach the proportions observed in humid and cooler climates. This mahonia does not appreciate excessive water, especially combined with winter cold. It therefore needs good drainage: about 20cm (8in) at the bottom of the planting hole. Add compost to the garden soil, and a little coarse sand if necessary. Be careful, as this bush has a fairly large habit. Leave enough space for it to grow and do not place it too close to a pathway to avoid its prickly foliage! To promote branching, it is essential to pinch out the young shoots in spring during the first few years.

Planting period

Best planting time March, October
Recommended planting time February to March, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Border, Free-standing, Hedge
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Partial shade, Shade
Soil pH Any
Soil type Clayey-chalky (heavy and alkaline), Silty-loamy (rich and light)
Soil moisture Moist soil, Deep, loamy, well-drained

Care

Pruning instructions Prune your young mahonia to ensure good establishment and help it branch out: simply pinch the faded flower stem. On a mature plant, just remove the dry or damaged branches.
Pruning Pruning recommended once a year
Pruning time March
Soil moisture Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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