Chelone obliqua Alba
Chelone obliqua Alba
Chelona obliqua Alba
Turtlehead, Twisted shell flower
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Description
Chelone obliqua var. Alba, also known as Oblique Turtlehead, is the most remarkable of the turtleheads and the easiest to grow in the garden. A perennial with a strong stump, it has rapid growth and will adapt to any moist to damp soil. The floral spikes are dense and the white flowers sometimes turn pale lilac. The shiny, dentate foliage is abundant and a beautiful bright green. It's a carefree plant.
Oblique turtlehead belongs to the family of Scrophulariaceae and is a cousin of Penstemons. It is native to the southeast of the United States and grows in moist woods from Minnesota to Massachusetts. 'Alba' is a cultivar selected for the light colour of its flowers. It is an herbaceous perennial with an upright habit, forming round-sectioned stems. Its growth is quite rapid. It blooms at the end of summer with flowers that are somewhat similar to those of foxgloves but in miniature. Flowers range in colour from pale pink to lavender, with a sparse white beard. They measure 1 to 2 cm (1in) long and are arranged in short, tight terminal spikes. The foliage is composed of shiny dark green leaves, almost sessile (without stalks), ovate to lanceolate, dentate, with well-marked veins, measuring 20 cm (8in) long. Its taproot root is thick and fibrous. It spreads via rhizomes.
Perfectly hardy, Oblique Turtlehead is a voracious plant that requires good amendment at planting. It appreciates moist soils and adapts to any type of soil, clayey, humus-bearing, loamy, acidic, neutral or alkaline, as long as it is deep. Bridging the gap between summer blooms and the flowering of asters, oblique turtlehead is valuable in perennial borders, in the company of geraniums, Lobelia, Rudbeckia and grasses. It will also thrive on the banks and shores of water features, contributing to their stabilisation.
Chelone obliqua Alba in pictures
Flowering
Foliage
Plant habit
Botanical data
Chelona
obliqua
Alba
Scrophulariaceae
Turtlehead, Twisted shell flower
Cultivar or hybrid
Planting and care
Plant oblique turtlehead in October or March in deep soil that has been carefully amended with leaf compost, as it is voracious. This plant appreciates dappled sunlight and partial shade. In flowerbeds, mulch the base from June onwards as the soil must remain moist. It will adapt to most types of moist soil, whether clayey, humus-bearing, loamy, acidic, neutral or alkaline, as long as it is deep and consistently moist to damp. Allow the stems to curl up on the clumps during winter, only removing them in spring. Divide the clumps that have become too large every three years. Make sure to protect them from attacks by snails and slugs.
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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