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Hypericum densiflorum Buttercup - St. John's wort

Hypericum densiflorum Buttercup
St. John's wort

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Michel L., 22/10/2019

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Value-for-money
A versatile and generous shrub that will thrive in most of our gardens. This deciduous undershrub, with dense, delicate and aromatic foliage, will not exceed 80cm (32in) in height with a spread of 1m (3ft). It offers a long uninterrupted flowering period from July until October, in the form of clusters of small bright golden yellow cups. A low-maintenance, undemanding plant, to be planted in full sun in cool regions, in partial shade in hot climates.
Flower size
3 cm
Height at maturity
80 cm
Spread at maturity
1 m
Exposure
Sun, Partial shade, Shade
Hardiness
Hardy down to -20°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 October
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Description

Hypericum densiflorum 'Buttercup' is, like the majority of St. John's wort, the archetype of an easy-to-care-for, generous plant, that is comfortable everywhere. This one is an all-terrain bush, not very tall, aromatic in all its parts, with dense and particularly fine foliage of a beautiful bluish green that turns yellow in autumn before falling. It provides a long flowering period from July to October, in the form of small bright golden yellow cups. It will thrive in all soils that are not too dry, in the company of other easy-to-care-for wild plants.

 

'Buttercup' is derived from Hypericum androsaemume. This medicinal and aromatic plant is native to southwestern Europe, particularly from a region called Anatolia, located at the western end of Asia. In nature, this undershrub grows in wet meadows, at the edge of ponds, in cool undergrowth, not far from watercourses. It belongs to the Hypericaceae family.

The 'Buttercup' cultivar is distinguished by its uninterrupted summer flowering in moist soil. This fairly fast-growing bush generally does not exceed 80cm (32in) in height and 1m (3ft) in width, but sometimes much more depending on growing conditions. It has a dense and rounded habit, rather spreading, carried by red to cinnamon-coloured stems, all arising from the stump. They are adorned with elongated, pointed, long, entire and narrow, leathery leaves, 5 to 10cm (2 to 4in) long. The deciduous foliage is a beautiful dark green with a slightly bluish underside, taking on a beautiful yellow colour in October highlighted by the cinnamon-coloured branches. It blooms practically four months of the year, from June-July to September-October, with possibly an interruption during the hottest weeks if the soil is dry. The flowers, produced abundantly in racemes of 5 to 11 flowers, 2.5 to 3.5cm (1in) in diameter, consist of 5 rounded, golden yellow petals arranged in an open cup. The centre of the flower is occupied by a crown of prominent, fairly long stamens. This flowering is followed by the formation of a few conical fruits that are red, then blue-black when ripe.

 

St. John's wort is appreciated for its long flowering period and its ease of cultivation in all soils and under all climates, even by the seaside. If you like yellow flowers, 'Buttercup' is ideal for a new garden, even for novice gardeners. It excels in low shrub beds or perennial beds, but also in undergrowth, at the edge of a grove. For example, it can be combined with dwarf buddleias, a Morning Mist rose, shrubby lavatera, weigelas (in moist soil), or Rhaphiolepis (in dry soil). Its yellow flowering will not compete with the more pastel spring flowering. Perfectly hardy, it should be planted in full sun in cool climates, but in partial shade in hot climates to protect its foliage from scorching sun.

Hypericum densiflorum Buttercup - St. John's wort in pictures

Hypericum densiflorum Buttercup - St. John's wort (Flowering) Flowering
Hypericum densiflorum Buttercup - St. John's wort (Foliage) Foliage

Plant habit

Height at maturity 80 cm
Spread at maturity 1 m
Habit Irregular, bushy
Growth rate fast

Flowering

Flower colour yellow
Flowering time July to October
Flower size 3 cm
Bee-friendly Attracts pollinators
Fruit colour red

Foliage

Foliage persistence Deciduous
Foliage colour green
Aromatic? Fragrant foliage when creased

Botanical data

Genus

Hypericum

Species

densiflorum

Cultivar

Buttercup

Family

Clusiaceae

Other common names

St. John's wort

Origin

Cultivar or hybrid

Product reference840981

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Planting and care

Plant in a very sunny position in cool climates, or in partial shade in warm climates. Its foliage can be damaged by excessive sun. Ensure it is sheltered from the wind. This St. John's wort appreciates moist to wet soils, but adapts well to occasionally dry soils. The soil's pH is not too important, as long as it is not excessively acidic or excessively calcareous. It needs deep, light, sandy or humus-rich soil. It is hardy up to -20°C (-4°F), not very susceptible to diseases, and its enemies are rare. Perform pruning for shaping in late winter.

Planting period

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

Intended location

Suitable for Meadow, Woodland edge, Undergrowth
Type of use Edge of border, Slope
Hardiness Hardy down to -20°C (USDA zone 6b) Show map
Ease of cultivation Beginner
Planting density 3 per m2
Exposure Sun, Partial shade, Shade
Soil pH Any
Soil type Silty-loamy (rich and light)
Soil moisture Dry soil, Moist soil, light, poor, well-drained

Care

Pruning instructions Perform a pruning for shaping purposes at the end of winter.
Pruning Pruning recommended once a year
Pruning time February to March
Soil moisture Dry soil, Moist soil
Disease resistance Very good
Overwinter Can be left in the ground
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