Hypericum calycinum - St. John's wort
Hypericum calycinum - St. John's wort
Hypericum calycinum - St. John's wort
Hypericum calycinum - St. John's wort
Hypericum calycinum - St. John's wort
Hypericum calycinum - St. John's wort
Hypericum calycinum
St. John's wort
Small plant received, but healthy and very green. Once planted properly, it took very well and produced a few flowers. I think the plant will develop well from next spring.
Patrice, 22/10/2025
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Description
Hypericum calycinum, also known as Large-flowered St. John's Wort or Rose of Sharon, is one of the best ground covers for a temperate climate. Prolific, even invasive, this perennial or subshrub resists everything, grows absolutely everywhere, and spreads through creeping stoloniferous stems. The large, bright yellow flowers, open and adorned with a tuft of long central stamens, bloom all summer long, carried by slender stems above evergreen dark-green foliage. This very hardy plant is a boon for difficult slopes, wild or neglected areas, on the outskirts of a large garden.
This plant, belonging to the Clusiaceae family (sometimes classified by certain authors in the Hypericaceae family), is native to Turkey. It is a deciduous perennial with a woody stump and creeping suckers, cousin to the shrubby St. John's wort so commonly planted in our gardens. The plant quickly forms a tuft 20 to 40 cm (7.9 to 15.7 in) high, which expands through stoloniferous stems that root upon contact with the soil. After a few years, the resulting carpet can reach impressive dimensions. Its rectangular leaves of a dark green shade are dotted with small translucent spots that contain numerous resinous glands. They measure about 4.5 cm (1.8 in) in length. The abundant flowering takes place from June to September, earlier or later depending on the climate. The solitary flowers are gathered in terminal cymes. They are composed of 5 bright yellow and shiny petals surrounding a crown of long protruding yellow stamens. This St. John's wort is almost indestructible, suffocating weeds with great efficiency.
Hypericum calycinum is an excellent plant for difficult, rocky, and dry areas or under trees where nothing grows. It is best suited for large spaces that allow it to fully play its role without interfering with other plants. Its preferred locations will be a large sunny slope, dry and shaded undergrowth, or the base of a hedge bordering the surrounding countryside.
Hypericum calycinum - St. John's wort in pictures
Flowering
Foliage
Plant habit
Botanical data
Hypericum
calycinum
Clusiaceae
St. John's wort
Mediterranean
Planting and care
St. John's wort with large flowers accepts any type of soil: light or clayey, moist or more or less dry in summer, and even limestone. It tolerates summer drought perfectly and can go without watering, but will be more floriferous in the sun with occasional watering in summer. It thrives in full sun, where it is more floriferous, but adapts perfectly to partial or even full shade, between the roots of trees. This plant tolerates mediocre and rocky soils perfectly, but does not fear clayey soils saturated with water in winter. Its lateral growth should be controlled by regularly eliminating the stoloniferous stems that develop on the periphery of the carpet.
Planting period
Intended location
Care
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).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
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 planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
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.
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