Ceanothus prostratus
Ceanothus prostratus
Ceanothus prostratus
Ceanothus prostratus
Ceanothus prostratus Prostratus
California Lilac
Correct plants.
Bernadette , 27/02/2024
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Description
Ceanothus prostratus is a bush with a prostrate habit that spreads by spontaneous layering in light soils. Forming a dark green carpet, covered with fine foliage of a very bright green, it blooms early in spring with a mass of bright blue flowers covering the ground. This botanical species perfectly resists drought once established, as well as frosts of around -10° C to 12° C (14° F to 10.4° F) in well-drained soil. An adorable decorative ground cover all year round, which will find its place above a wall or in a rock garden.
Ceanothus prostratus is a wild Ceanothus, native to the entire northwestern region bordering the North American Pacific, and is also present in the state of Washington. Its natural environment corresponds to the understory of mixed forests, foothills of subalpine areas, open plains, and dry forests. Two subspecies are distinguished, of which Ceanothus prostratus is the most creeping and widespread form in nature. Ceanothus belong to the Rhamnaceae family. This very low bush has a prostrate, spreading, and creeping habit, reaching a minimum height of 40 cm (15.7 in) and a spread of 2 m (6.6 ft) at a minimum. Its flower buds appear in March-April, at the tips of the branches, grouped in small dense panicles. They open into intensely lavender-blue flowers, which are slightly fragrant and very popular with bees. It is followed by the formation of seeds which, once mature, are released explosively. The evergreen foliage is composed of small glossy green leaves that are opposite, ovate, dentate, with deep veins, 1 cm to 3 cm (0.4 in to 1.2 in) long, and somewhat resemble miniature oak leaves. Its average lifespan is 15 to 20 years, and its preferred climate will be rather coastal.
Ceanothus offer some of the most beautiful blue flowerings. Tolerating poor, even rocky and slightly calcareous soils, Ceanothus prostratus is a superb and easy-to-grow ground cover in mild climates. Plant it above a retaining wall, for example with creeping rosemary, aubrietas, and wallflowers. It can also be mixed with small, easy-to-grow bushes in mild climates, which will precede or take over its beautiful flowering: rock roses, oreganos, teucriums, thymes, and other lavenders. It will also thrive by the sea. This variety will enhance your balconies and terraces when planted in large containers, with some precautions.
Ceanothus prostratus in pictures
Plant habit
Flowering
Foliage
Botanical data
Ceanothus
prostratus
Prostratus
Rhamnaceae
California Lilac
North America
Planting and care
Place in a sunny or partially shaded position. Plant it in ordinary soil that must be moist but also well-drained. Beware of cold drafts; place near a wall to protect it. Plant it throughout the year, except during frost, by mixing your garden soil with compost, coarse sand, perlite, or any material that does not retain moisture. Water generously once or twice a week to encourage growth. Only water twice a month from the third year onwards, and during prolonged drought. This is a low-maintenance plant that grows easily as long as the required conditions are met. Constant moisture in the soil during the winter period, as well as in summer, is harmful to the plant. The combination of high heat and humidity leads to the development of a fungus that attacks the collar of the plant and can be fatal, just like a Siberian frost. That's why, in affected soils, it is better to plant Ceanothus on a mound. You can lightly prune the stems after flowering to encourage branching. Fertiliser is not recommended (just add a little horn at the bottom of the planting hole). Avoid severe pruning.
Cultivation in pots:
Use a lightweight substrate, a mixture of garden soil, coarse sand, and compost. In summer, water abundantly only when the soil is dry, but space out the waterings. The plant can be stored in a cool, bright room with little or no heating, protected from severe frost. Apply a slow-release fertiliser in spring and autumn.
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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