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Catharanthus roseus Heatwave Mix seeds - - Madagascar periwinkle

Catharanthus roseus Heatwave Mix
Madagascar periwinkle

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Perennial in the tropics, these attractive, tender, flowering plants are grown as annuals in our temperate climates. Easy to grow from a spring sowing, they will provide you with flowers all summer long, similar to single Oleander blooms. This selection includes specimens with white, pink, and purple flowers, superb in hanging baskets and planters, which should be overwintered under cover during winter. They are also perfect for flower beds, combining rapid growth, good heat tolerance, and limited water requirements.
Flower size
4 cm
Height at maturity
30 cm
Exposure
Sun
Germination time (days)
21 days
Sowing method
Sowing under cover with heat
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Sowing period January to March
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Flowering time June to October
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Description

Sow this Madagascar Periwinkle Heatwave Mix seed blend early to enjoy a multicoloured flowering from June to October. Catharanthus roseus is a tender perennial from Madagascar which is cultivated as an annual. Superb in the garden in borders, flowerbeds or beds, it can also be grown in pots, hanging baskets and planters. This very floriferous plant is particularly easy to grow due to its resistance to heat and diverse growing conditions. It is a fast-growing annual, one of the best for flowering displays.

The Madagascar Periwinkle, whose scientific name is Catharanthus roseus, belongs to the Apocynaceae family, rich with about 350 genera and 5000 species, mostly native to subtropical and tropical zones, like Frangipani or Hoya, grown as a houseplant. Nevertheless, some grow in our temperate or Mediterranean climates, such as the popular Periwinkles (Vinca), which form groundcover carpets, or the much less common Oxypetalum with its unreal blue flowers.
The Catharanthus genus comprises eight species, only one of which is not endemic to Madagascar. In its country of origin, C. roseus, the Madagascar Periwinkle, grows in the east and south of the large island, from sea level up to 1800 m altitude, in both moist but well-drained soils and dry ones. This great versatility explains its usefulness in horticulture and the number of cultivars on the market today. It is a herbaceous perennial plant that can reach 1 m in height, with an erect or trailing habit. It bears elliptical to obovate leaves, 2.5 to 9 cm long and 1 to 3.5 cm wide. Borne on short petioles (less than 5 mm), the leaves are glossy and dark green. The solitary flowers, formed of a tube 2.5 to 3 cm long which opens into spreading, rounded petals, are white, pink or red depending on the specimen. In these climates, the plant flowers almost continuously all year round.
The Heatwave Mix brings together the twelve flower colours of the varieties from the Heatwave range, plus the Santa Fe variety. Your seeds will therefore give you young plants whose main colours will be white, pink and purple, as well as many intermediate variations, monochrome or with a different coloured heart. All these nuances are perfectly highlighted by the medium to dark green, satiny foliage. These fast-growing annuals sown at the beginning of the year will produce plants approximately 30 cm high and wide by late spring. Their compactness creates carpets of flowers within beds and makes them ideal for planters or pots. The 3 to 4 cm diameter flowers are constantly renewed from June to October, making this plant one of the best for summer flowering displays. These Madagascar Periwinkles require almost no maintenance; the faded flowers fall off by themselves. The plants are quite resistant to drought and heat, even if some additional water is beneficial in summer. Their fertilisation needs are also quite modest.

The Madagascar Periwinkle Heatwave Mix blend will bring you maximum pleasure for minimum effort and care. Growing from seed is economical, allowing you to obtain many young plants at low cost and cover a large space en masse. On par with Petunias and Surfinias, this annual is great in the summer garden. You can also use it in combination to form displays in containers alongside Bacopa with its charming little flowers, or the superb Euphorbia 'Diamond Frost', with its multitude of small white flowers that halo the plant like a cloud.

Note: All parts of the plant contain toxic alkaloids, from which effective molecules for the treatment of leukaemia have been derived.

 

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Flowering

Flower colour multicoloured
Flowering time June to October
Inflorescence Solitary
Flower size 4 cm

Foliage

Foliage persistence Evergreen
Foliage colour medium green

Plant habit

Height at maturity 30 cm
Spread at maturity 30 cm
Growth rate fast

Botanical data

Genus

Catharanthus

Species

roseus

Cultivar

Heatwave Mix

Family

Apocynaceae

Other common names

Madagascar periwinkle

Botanical synonyms

Ammocallis rosea, Lochnera rosea, Vinca rosea

Origin

Cultivar or hybrid

Product reference24490

Planting and care

Sow the seeds of Madagascar Periwinkle indoors in warmth, for example, in a propagator, 10 to 12 weeks before the last frosts in your area (from January to February-March). Use plug trays or seed trays, and standard seed compost. Press them gently into the soil and cover lightly. Madagascar Periwinkle seeds require darkness to germinate. Cover them with newspaper or place them in a black plastic bag. Protect them from direct sun, but place them at a temperature of 24 to 27 °C. Germination will occur in 10 to 21 days. Then remove the newspaper or bag, and expose to direct light as soon as the first seeds begin to germinate. When the young plants have 3 to 4 true leaves (in addition to the cotyledons), transplant them into 5 to 7.5 cm pots. Transplant the Madagascar Periwinkle young plants into the garden 30 cm apart from each other, when the soil and air temperature are consistently above 18 °C.

Madagascar Periwinkles, endemic to the island of Madagascar, grow equally in humid mediums or in dry, almost arid zones, from sea level up to 1800 metres in altitude. In the wild, they also grow just as well in prairies, cultivated land, open forests, and along paths. This shows how undemanding and easy these plants are in sun, partial shade, or even shade in warm regions. Their only requirement is a well-drained soil, kept just moist during the flowering period. They are tender perennial plants that should be sheltered in winter, by storing them in a very bright room, not too heated, even though they tolerate a rather dry atmosphere well. You can lightly pinch the tips of the stems during growth to maintain a bushy habit, but not too much, as it could hinder flowering.

Sowing period

Sowing period January to March
Sowing method Sowing under cover with heat
Germination time (days) 21 days

Intended location

Suitable for Meadow
Type of use Border, Container, Greenhouse, Conservatory
Hardiness Hardy down to +1.5°C (USDA zone 10b) Show map
Ease of cultivation Amateur
Exposure Sun
Soil pH Any
Soil moisture Dry soil, Moist soil Ordinary, well-drained soil.

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