Ceratostigma willmottianum FOREST BLUE
Ceratostigma willmottianum FOREST BLUE
Ceratostigma willmottianum FOREST BLUE
Ceratostigma willmottianum FOREST BLUE
Ceratostigma willmottianum FOREST BLUE
Ceratostigma willmottianum Forest Blue
Chinese plumbago, Hardy plumbago, Blue plumbago, Leadwort, Willmott's plumbago
The plant arrived in very good condition. It immediately rooted well and started flowering. 3 years later, the plant has quadrupled in size. Its sapphire flowers are beautiful.
florence, 10/10/2024
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Description
Ceratostigma willmottianum FOREST BLUE ('Lice') is undoubtedly the most floriferous variety of all. In late summer to early autumn, it is adorned with a multitude of star-shaped flowers in an unprecedented cobalt blue. Its lovely dome-shaped habit makes it ideal as a ground cover and it works wonders in flowerpots and containers on a terrace. Place it in a warm and sheltered location.
Ceratostigma willmottianum, sometimes called Leadwort or Willmott's Plumbago, belongs to the Plumbaginaceae family. It is a deciduous shrub native to western China that appreciates sun, heat, and soils with a tendency towards limestone. It is hardy to around -12° C (10.4° F) in well-drained soil.
The cultivar 'Forest Blue' was recently selected in England for its cold resistance (about -14° C (6.8° F)), its more compact habit, and its abundant flowering. All these qualities have earned it recognition from the Royal Horticultural Society. It is a small shrub with a flexible habit, compact growth, and a slightly spreading and well-branched shape, reaching about 60 cm (23.6 in) in height and a little more in width. The foliage is deciduous, falling in late autumn and reappearing quite late in spring. The small leaves have an oval shape that approaches that of a diamond and are covered with hairs on the upper and lower surface. Their colour changes from medium green in spring and summer to red from September onwards. From July until the first frost, it produces a myriad of tubular flowers with 5 petals, in a particularly bright blue. In autumn, the reddish-purple foliage creates a beautiful contrast with the blue flowers.
'Forest Blue' is an excellent plant for sunny gardens or terraces. It will thrive in most regions, except the coldest and driest ones in summer. Growing it in pots allows you to protect it in a cold greenhouse for winter if necessary, but also to plant it with many summer-flowering annuals to easily create a very colourful display on a balcony or terrace. In the garden, for example, plant it with yellow flowers (Coreopsis 'Sunray', goldenrods, Helenium) or with the purple and pink stars of asters. Pink ground cover roses with slightly blurry shapes like The Fairy, Mareva or Emera will also enhance it, along a path or in front of taller shrubs.
Ceratostigma willmottianum FOREST BLUE in pictures
Plant habit
Flowering
Foliage
Botanical data
Ceratostigma
willmottianum
Forest Blue
Plumbaginaceae
Chinese plumbago, Hardy plumbago, Blue plumbago, Leadwort, Willmott's plumbago
Cultivar or hybrid
Planting and care
Plant in well-drained soil, even limestone, in a sunny location and sheltered from cold winds. If the soil in your garden is heavy, clayey, and moist in winter, improve drainage by mixing gravel or river sand and compost. You can also plant it in a raised bed or rockery. This plant is easy to grow; only severe cold and excessive drought should be avoided. It can also be used in a pot, with a good potting soil enriched with slow-release fertiliser. Watering should be more regular in containers, allowing the surface of the substrate to dry a little between two waterings.
Although water-efficient, it is not suitable for very dry land.
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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