Hypericum olympicum Citrinum - St. John's wort
Hypericum olympicum Citrinum - St. John's wort
Hypericum olympicum Citrinum - St. John's wort
Hypericum olympicum Citrinum - St. John's wort
Hypericum olympicum Citrinum
Olympic St. John's Wort, Mount Olympus St. John's Wort
After 3 years, the Hypericum has spread a little but very slowly. It hardly flowers at all... ultimately, I'm rather disappointed.
sys, 01/11/2025
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Description
Hypericum olympicum 'Citrinum' is a perennial or semi-evergreen undershrub that loves the sun and resists drought well. Its abundant light lemon-yellow flowers are wide open with a tuft of central stamens. They bloom in summer, carried by thin stems above small grey-green foliage a little wider than the species type and 2 to 3cm (1in) long. This suckering plant forms a dense ground cover for rockeries and borders, in drained soil. Very hardy.
Hypericum olympicum 'Citrinum' belongs to the Hypericaceae family. It is a semi-evergreen perennial with a woody and suckering stump, related to the shrubby St. John's wort. From its Greek, but also Balkan, Syrian, and Turkish origins, it has retained a certain taste for sunny situations and a good tolerance for poor and dry soils. The plant forms a dense tuft, 30cm (12in) high, producing numerous upright branches in the centre, while they are arched or even prostrate on the periphery of the tufts. Its oblong leaves of a grey-green shade measure about 2.5cm (1in) in length. The abundant flowering takes place in June-July, depending on the climate, and sometimes reoccurs in September-October. The flowers are gathered in small terminal clusters and are composed of 5 bright yellow petals surrounding a small tuft of protruding golden stamens. It spreads slowly through prostrate stems that root on contact with the soil.
Hypericum olympicum 'Citrinum' is an excellent plant for dry gardens or rockeries. Its light colour is unique. It will thrive in drained soil, even limestone, alongside pussytoes, globularias, candytufts, or sunroses. It also forms dense borders, perfect for planting in front of fragrant bushes like lavender, rosemary, lavatera, or wormwood. It will also enjoy a sunny slope, cascading over a wall. It will have the most beautiful effect in the foreground of perennial beds or raised flower beds. It can be planted with numerous other rockery plants: erigeron, dianthus, shrub wallflower, and perennial plants like Iris germanica, cistus, heleniums, convolvulus, coreopsis, shrubby sages, and perennial flax.
Hypericum olympicum Citrinum - St. John's wort in pictures
Flowering
Foliage
Plant habit
Botanical data
Hypericum
olympicum
Citrinum
Clusiaceae
Olympic St. John's Wort, Mount Olympus St. John's Wort
Cultivar or hybrid
Planting and care
Plant in any type of well-drained soil that is moist in winter and spring, dry in summer. It will tolerate limestone and poor or stony soils. It cannot withstand saturated soils in winter. It perfectly tolerates summer drought and does without watering, but will show more flowers with a water supply in summer. It thrives in full sun, where it is more floriferous, but adapts perfectly to partial shade. Control its lateral growth by eliminating the shoots that develop on the periphery of the clump.
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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