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Cosmos sulphureus Bright Lights Mix - seeds

Cosmos sulphureus Bright Lights Mix
Sulphur Cosmos, Yellow Cosmos, Orange Cosmos

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An assortment of easy-to-grow Cosmos in flamboyant tones, flowering continuously from July until mid-autumn. They develop as a branched clump of about 60 centimetres high with semi-double flowers in shades of tangerine, yellow, gold, and orange, above ferny foliage. Suitable for container gardening, on balconies or terraces, they fit perfectly as border plants and in summer flower beds, and blend harmoniously in meadows. This generous and undemanding cosmos thrives in various soil types, even in relative drought.
Flower size
7 cm
Height at maturity
60 cm
Exposure
Sun
Annual / Perennial
Annual
Germination time (days)
15 days
Sowing method
Direct sowing, Sowing under cover with heat
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Sowing period March to May
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Flowering time July to October
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Description

Cosmos sulphureus 'Bright Lights Mix' ensures a long and intense flowering with shimmering shades of orange and yellow. These are undemanding annual plants, known for their easy cultivation and rapid growth to form a bushy, erect and branched clump, adorned with finely cut dark green foliage. During summer and until autumn, its bright flowers attract many pollinators, including bees and butterflies, contributing to the biodiversity and biological balance of the garden. The exuberant and intense flowering brings brightness and charm to flower beds, borders, pots and meadows. They gracefully enrich romantic and rustic gardens, harmoniously mingling with perennial plants, bulbs and roses, while offering an inexhaustible source of flowers for making various floral compositions. Sown in March and transplanted in April, they will begin flowering from mid-June. The seeds come from organic farming.

Cosmos sulphureus, also known as Sulphur Cosmos, Mexican Cosmos, or Klondike Cosmos, belongs to the asteraceae family. Native to Mexico and widely distributed in Africa and Asia, it is considered an invasive plant in the United States and Brazil. This not very hardy annual plant, related to Dahlias, shows a characteristic flower head and coarser foliage than the bipinnate cosmos (Cosmos bipinnatus). It has a branched habit and finely cut, light green, ferny leaves and flowers constantly from June to the first frost. The flowers have dyeing properties, producing an orange-yellow dye which was used in Native American cultures and later in southern Africa to dye wool.

The 'Bright Lights' variety forms a branched clump about 0.60 to 0.70 m tall, with a spread of 0.30 to 0.40 m. The stems bear fine, 15 to 20 cm long ferny leaves with five pinnate lobes to the central vein, in a pretty light green. They emit a light and pleasant fragrance. It begins flowering around June-July, approximately 80 to 90 days after sowing, and continues until mid-autumn. The semi-double flower heads measure 6 to 8 cm in diameter and have pleated and toothed petals in shades of yellow, golden yellow, bright orange or vermilion red, surrounding a golden yellow central disk. The flowers have very good vase life, able to last 7 to 10 days without losing their brightness. After flowering, the plant produces blackish conical seeds, seed-grown plants may differ from their parent. The flower petals are edible and can enhance salads with their spicy taste.

The Cosmos Bright Lights Mix blends perfectly with other varieties of Cosmos and can be easily associated with different plants such as perennial salvias, Buenos Aires verbena, Tree Mallow, Cleomes, Common Mallow, Peruvian Heliotrope or Love-in-a-Mist. Despite its delicate appearance, it is robust and easy to maintain. It will flower without difficulty, regardless of the conditions: modest soil, heat, humidity... As long as it receives sunlight.

An ecological asset: Throughout the summer, the nectar-rich flowers of Cosmos attract pollinating insects, butterflies and birds to your garden. A good way to improve the ecosystem and promote fruit and vegetable production in your vegetable garden. Tip: At the end of the season, let the plants dry naturally on the stem; this will provide seeds for birds, especially goldfinches.

Organic or "AB" seeds come from plants grown in organic farming (without using phytosanitary products). They undergo no treatment after harvest. These seeds are suitable for organic market gardening.

 

Flowering

Flower colour multicoloured
Flowering time July to October
Inflorescence Solitary
Flower size 7 cm
Bee-friendly Attracts pollinators
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour medium green
Aromatic? Fragrant foliage when creased

Plant habit

Height at maturity 60 cm
Spread at maturity 30 cm
Growth rate fast

Botanical data

Genus

Cosmos

Species

sulphureus

Cultivar

Bright Lights Mix

Family

Asteraceae

Other common names

Sulphur Cosmos, Yellow Cosmos, Orange Cosmos

Origin

Cultivar or hybrid

Planting and care

The seeds of Sulphur Cosmos are small: about 120 per gram. There are two possible methods of sowing:

Sowing under cover, before transplanting and planting in open ground: Sow from March to May, at a depth of 2 or 3 mm, in fine compost and cover the seeds with a very fine pinch of vermiculite. Place the seed tray in a propogator at a temperature of 18-25°C, or wrap it in a polythene bag. Keep the soil moist, but not waterlogged. Light promotes germination, which occurs 7 to 21 days after sowing. When the seedlings are large enough to handle, transplant them into individual pots with a diameter of 7 cm. Grow them in cooler conditions until the plants are sufficiently developed to be planted outside. When all risk of frost has passed, gradually acclimatise the plants to outdoor conditions for 7 to 10 days. Plant them in full sun, in moist, well-drained soil, spaced 25 to 40 cm apart. Pinch the tips of the shoots on each stem during transplantation to encourage branching and the production of numerous flowers.

Direct sowing in open ground: This is easier and can be done from May to June, after the last frost. Sow the seeds spaced apart in prepared soil, covering them with about 2 mm of a light substrate. Germination takes approximately 10 to 20 days. Once the young seedlings reach the stage of 4 to 6 leaves, thin them out to leave one plant every 20 to 30 cm.

Cosmos prefer a soil pH between 6 and 8.5, corresponding to the soil of their original habitat, the alkaline regions of Central America. They prefer full sun but tolerate partial shade. These plants are drought-tolerant once established, they are not very susceptible to diseases but can be targeted by aphids. Self seeding is common but not always true to type.

Sowing period

Sowing period March to May
Sowing method Direct sowing, Sowing under cover with heat
Germination time (days) 15 days

Intended location

Suitable for Meadow, Rockery, Flowerbeds
Type of use Border, Container, Slope
Ease of cultivation Beginner
Exposure Sun
Soil pH Neutral, Calcareous
Soil moisture Dry soil, Moist soil, Dry soil, moist soil, well-draining, not too rich.

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