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Hypericum inodorum Magical White Kolmawhi - St. John's wort

Hypericum x inodorum Magical White® 'Kolmawhi'
St. John's wort

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More information

Like all the shrubby St. John's wort in the Magical Series, Hypericum Magical White has a dense and bushy habit, and its beautiful semi-evergreen foliage is resistant to rust. It offers abundant bright yellow flowering in summer, followed by the formation of clusters of fruits that are very bright white when ripe and remain decorative until autumn. Easy to grow in well-drained soil, in full sun or partial shade.
Flower size
3 cm
Height at maturity
90 cm
Spread at maturity
1.10 m
Exposure
Sun, Partial shade, Shade
Hardiness
Hardy down to -23°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, October
Recommended planting time March to May, September to November
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Flowering time July to September
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Description

Hypericum x inodorum Magical White ('Kolmawhi'), like all bushy St. John's worts in the Magical Series, has a naturally compact habit, and its beautiful semi-evergreen foliage resists rust well. It is covered with small golden yellow flowers throughout summer, followed by beautiful clusters of shiny white fruits, turning black when ripe. Flowers and fruits mix on the plant throughout summer on beautiful green-blue foliage, and the fruits, which often persist until early winter, contribute to making this shrub attractive for long months. An all-terrain plant par excellence, St. John's wort thrives in full sun or partial shade in flower beds, rockeries, borders, or even in a container on a patio.

 

'Kolmawhi' is part of a new generation of hybrids developed in Holland, resistant to the rust disease that affects many bushy hypericums in humid climates, especially those derived from the Hypericum inodorum species, native to the Island of Madeira. The Magical hypericums produce berries of various colours, ranging from white to green, yellow, pink and orange, to red and almost black. These compact little bushes flower abundantly from the first year in the garden, and bear fruit generously and regularly. All these plants belong to the Hypericaceae family.

Magical White grows rapidly. Generally, it does not exceed 90cm (35in) in height and 1.1m (4ft) in width. It has a bushy and dense habit, well-branched vegetation, and mostly semi-evergreen leaves. They are oval-shaped, leathery, without petioles, light green in spring, darkening in summer, and slightly glaucous underneath. It flowers throughout summer, from June-July to September. The flowers are produced abundantly in clusters of 3 to 23 tiny flowers, 1.5 to 3cm (1in) in diameter. They consist of 5 rounded, golden yellow petals arranged in an open cup. The centre of the flower is occupied by a crown of protruding, rather long stamens. The main attraction of this variety is its astonishing white fruiting. Gathered in clusters, the small conical shiny white berries turn black at the end of the season.

 

St. John's worts are appreciated for their very long flowering period and their ease of cultivation in all soils and under all climates, even by the sea and even in the shade. If you like yellow flowers, Magical White is an ideal choice for a new garden, even for novice gardeners. It excels in low shrub or perennial flower beds, but also planted in a large pot on a patio or balcony. For example, you can plant it with purple foliage plants (physocarpus, berberis, bronze fennel) in a fashionable design, or play on the perfect harmony between the yellow of its flowers and the blue of perovskia, caryopteris, nepeta, or perennial geranium. Surround your composed flower beds with eEuphorbias and alchemillas, with very flattering foliage. Its summer yellow flowering will not compete with the more pastel spring flowers. Its long-lasting flowers, as well as its branches laden with white pearls, can be used in original bouquets.

Hypericum inodorum Magical White Kolmawhi - St. John's wort in pictures

Hypericum inodorum Magical White Kolmawhi - St. John's wort (Flowering) Flowering
Hypericum inodorum Magical White Kolmawhi - St. John's wort (Foliage) Foliage

Plant habit

Height at maturity 90 cm
Spread at maturity 1.10 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour yellow
Flowering time July to September
Inflorescence Cyme
Flower size 3 cm
Bee-friendly Attracts pollinators
Fruit colour white

Foliage

Foliage persistence Semi-evergreen
Foliage colour green
Aromatic? Fragrant foliage when creased

Botanical data

Genus

Hypericum

Species

x inodorum

Cultivar

Magical White® 'Kolmawhi'

Family

Clusiaceae

Other common names

St. John's wort

Origin

Cultivar or hybrid

Product reference841051

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Planting and care

In warm regions, plant in semi-shade or full shade. Its foliage can be damaged by scorching sun. In cool regions, plant in the sun. Shelter it from wind. It can adapt to most soils, as long as they are well prepared. Soil pH is not important, but it should not be excessively acidic or excessively alkaline. It needs light, well-drained soil, deep enough to allow it to better resist dry summers. It is quite hardy, resistant to diseases, and its enemies are rare.

Carry out a shaping pruning, after flowering, or at the start of spring.

 

 

Planting period

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

Intended location

Suitable for Meadow, Rockery, Woodland edge, Undergrowth
Type of use Border, Edge of border, Container, Hedge, Slope
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 3 per m2
Exposure Sun, Partial shade, Shade
Soil pH Calcareous, Any
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, Deep, light, poor, draining

Care

Pruning instructions Carry out a shaping pruning, after flowering, or at the start of spring.
Pruning Pruning recommended once a year
Pruning time October
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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