Senecio serpens - Blue chalksticks
Senecio serpens - Blue chalksticks
Senecio serpens - Blue chalksticks
Senecio serpens - Blue chalksticks
Senecio serpens - Blue chalksticks
Senecio serpens - Blue chalksticks
Senecio serpens
Blue chalksticks
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Description
Le Senecio serpens est une plante grasse au feuillage bien bleuté, originale et graphique, souvent utilisée pour l'aménagement des grandes rocailles méditerranéennes. C'est une plante basse et ramifiée qui s'étale avec le temps en grand couvre-sol, si on lui laisse de la place. Sa floraison tardive qui prend la forme de capitules blanc-crème n'est pas spectaculaire. Frileuse, cette Sud-africaine ne supporte que quelques degrés de gel, si le sol est très bien drainé. Sa culture dans un grand pot, en sol léger, ne présente pas de difficulté et permet de l'abriter du gel en hiver.
Le Senecio serpens (ou Curio repens), nommé "Blue Chalksticks" par les anglophones, est un petit arbuste tapissant de la famille des Astéracées originaire d'Afrique du Sud. Formant un buisson bas et très ramifié de 30 à 50 cm de hauteur, ce Senecio s'étale sur plus de 2 m avec le temps, ses longues tiges prostrées et charnues sont bien ramifiées. La croissance de cette plante se fait à un rythme régulier, plutôt rapide à la faveur des pluies, essentiellement en fin d'été et au printemps. Les rameaux portent de longues feuilles étroites et effilées, cylindriques, succulentes, dressées, très bleues, couvertes d'une pellicule cireuse et d'une pruine blanche pour résister aux périodes de chaleur et de sécheresse. La floraison a généralement lieu en fin d'été, d'août-septembre à début décembre sous nos climats. Des tiges florales de 30 cm de haut, feuillées à la base et ramifiées, se dressent parmi le feuillage, portant à leur extrémité des inflorescences en petits capitules d'un blanc-crème, assez discrets.
Frileux, ce Senecio serpens semblerait capable de supporter -6°C en sol très drainant, voire sec l'hiver. Par conséquent, la plante n'est cultivable en pleine terre qu'en climat très doux, en particulier en bord de mer. Sur la Côte d'Azur, il est planté sous les grands palmiers, en grand couvre-sol, ou dans de grandes rocailles en compagnie d'Agaves, Opuntia, Cactus et autres plantes grasses. Il est heureusement facile à cultiver dans un grand pot partout ailleurs. L'essentiel est de soigner le drainage au fond du pot et de lui fournir un sol très léger, bien drainé. Dans ce cas, des arrosages en été seront particulièrement appréciés par la plante. N'oubliez pas de l'entreposer à l'abri du gel en hiver, dans un local lumineux, aéré, frais, en réduisant très nettement les arrosages.
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Senecio serpens - Blue chalksticks in pictures
Plant habit
Flowering
Foliage
Botanical data
Senecio
serpens
Asteraceae
Blue chalksticks
Curio repens
South Africa
Planting and care
Plant the Senecio serpens 'Blue Chalk' in spring, after the last frosts, in open ground in very mild climates or in a large pot elsewhere. Place it in very well-draining soil, possibly mixing coarse sand, gravel, or pumice with your garden soil. Choose a well-sheltered, warm, very sunny to partially shaded position. A few generous waterings in summer, in dry and hot climates, will stimulate its growth. Native to South Africa, it tolerates periods of summer and winter drought well. Outdoors, without protection but planted in a rockery, this plant can withstand temperatures down to -6°C at their lowest: the above-ground parts die back, and the plant regrows the following spring from its roots.
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.