Gentiana Crystal Ashiro®
Gentiana Crystal Ashiro®
Gentiana Crystal Ashiro®
Gentian, Gentianella
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Description
The 'Crystal Ashiro' Gentian is a deciduous and very hardy variety of gentian, of relatively small size. Its very pretty flowers, upright trumpets, are white with light blue stripes and speckled with blue on the white parts. They bloom in mid-summer on a compact tuft of shiny green foliage. This variety will thrive in a cool rock garden in the morning sun or in partially shaded flower beds with moist soil.
The 'Crystal Ashiro' Gentian is part of the Ashiro series, which includes compact and colorful hybrids developed by Dr. Hikage in Japan. It belongs to the Gentianaceae family. It is a perennial cushion plant, slightly spreading, with deciduous or semi-evergreen foliage. Its lanceolate leaves are slightly pointed, rough, measuring about 4 to 6 cm long, a beautiful dark green color, with occasionally a bluish-violet tint at the tips. Slow-growing, it does not exceed 30 cm in all directions. Between July and September, numerous large solitary flowers in the form of wide trumpets bloom on very short stems, facing upwards. They open at the axils of the leaves or in terminal clusters, nearly hiding the foliage. They fully open only in very bright light. Each flower has a corolla composed of 5 lobes with a prominent and slightly curved central zone, white in color with light blue stripes along the edge of each petal. The white parts are also speckled with blue. This gentian develops a main root that goes deep into the soil and does not appreciate being disturbed.
This hybrid gentian 'Crystal Ashiro' is an alpine plant and may seem delicate to grow. It is actually robust and low-maintenance as long as the soil and exposure conditions are suitable. This mountain plant does not tolerate hot climates or more or less dry, limestone, and/or poorly drained soils. Place it in a cool, acidic, well-drained, fertile soil. It thrives in rocky, sunny but not too hot spaces, or partially shaded areas, where it can establish deep roots. Plant it in a rock garden, on a slope, at the edge of flower beds, or in a pot. Pair 'Crystal Ashiro' with other alpine plants, dwarf conifers, and bulbs such as Botanical Tulips, Crocuses, and Snowdrops. In partially shaded flower beds, combine it with Corydalis, Heucheras, and Brunneras. In pots, provide the same growing conditions.
The term Gentiana refers to Gentius, king of Illyria (present-day Albania) in the 2nd century BC, who, according to Pliny the Elder, discovered the medicinal and healing properties of the root of the Yellow Gentian.
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Flowering
Foliage
Plant habit
Botanical data
Gentiana
Crystal Ashiro®
Gentianaceae
Gentian, Gentianella
Cultivar or hybrid
Planting and care
The 'Crystal Ashiro' Gentian should be planted in spring or autumn. During planting, between September and March, it should be placed in soil enriched with compost, non-limestone gravel, and humus-bearing, acidic soil, such as leaf compost. The soil should be well-drained but moist throughout the year. This plant is perfectly cold-resistant and does not appreciate hot climates and scorching summers. In spring, it would benefit from a fertilizer application in the form of crushed horn or well-decomposed manure. Its flowers open in the light and close in the evening, so a semi-shaded or sunny exposure in the morning would be welcome. In a cold greenhouse, this hybrid Gentian should be planted in a 10 to 20 cm pot, depending on the size of the plant, and in a mixture of compost and non-limestone gravel. Repot every year without disturbing the plant's main root.
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).
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 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.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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