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Cosmos Sensation Radiance - Cosmos bipinnatus seeds

Cosmos x bipinnatus Sensation Radiance
Garden Cosmos, Mexican Aster

4,8/5
12 reviews
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Planted as soon as they arrived along with other seeds purchased at a G.V. store, ONLY ONE SEED in the packet germinated. It's better to buy seeds from a traditional store, even if it costs 2 euros more, rather than wasting time and money having to buy more later.

Claire, 31/03/2024

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This plant carries a 6 months recovery warranty

More information

Value-for-money
Annual variety with giant flowers adorned with candy pink petals speckled with carmine pink.
Flower size
9 cm
Height at maturity
90 cm
Exposure
Sun
plantfit-full

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Sowing period February to April
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Flowering time July to September
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Description

The Giant Sensation Radiance Cosmos is an annual variety with giant flowers adorned with candy pink petals maculate with carmine pink.

Native to Mexico, the Cosmos bipinnatus is an annual that blooms from mid-July to autumn.

The Sensation Radiance variety has large flowers with a diameter of 8 to 10cm (3.1 - 3.9 in), featuring candy pink petals maculate with carmine pink.

This variety has pinnatisect leaves (symmetrically arranged along the axis of the central vein) and is medium green in color. The Sensation Radiance Cosmos grows up to 80cm (31.5 in) to 1m (3.3 ft) tall.

The Cosmos bipinnatus is highly branched and is suitable for borders, flowerbeds, and can even be used as cut flowers. It is planted in spring between March and May. It has very rapid growth.

Cosmos is highly favored by bees. In the language of flowers, the word cosmos signifies innocence.

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Cosmos: sowing and planting
Family sheet
by Virginie T. 14 min.
Cosmos: sowing and planting
Read article

Flowering

Flower colour pink
Flowering time July to September
Flower size 9 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour medium green

Plant habit

Height at maturity 90 cm
Spread at maturity 30 cm
Growth rate fast

Botanical data

Genus

Cosmos

Species

x bipinnatus

Cultivar

Sensation Radiance

Family

Asteraceae

Other common names

Garden Cosmos, Mexican Aster

Origin

Cultivar or hybrid

Product reference314111

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Planting and care

Sow the seeds of the Giant Sensation Radiance Cosmos in full sun or partial shade, in moderately fertile, neutral, well-drained and humus-bearing soil. Sow the seeds from March to May for a flowering period from July to autumn. Cultivating this plant is easy but it can be prone to aphids. The Sensation Radiance Cosmos enjoys watering in the summer but it is still a relatively drought-tolerant plant.

Sowing period

Sowing period February to April

Intended location

Type of use Border, Container
Ease of cultivation Beginner
Exposure Sun
Soil pH Neutral
Soil moisture Moist soil, well-drained

Planting & care advice

  1. How to sow cosmos

Cosmos are easy-to-grow, long-flowering annuals (Cosmos bipinnatus, Cosmos sulphureus) ideal for borders, beds and pollinator-friendly gardens. Follow these steps for reliable results.

When to sow
- Sow under cover: 4–6 weeks before last expected frost.
- Sow outdoors: after all risk of frost has passed and soil has warmed.
- In mild climates: sow in autumn for early spring display.
- For continuous flowering: sow every 2–3 weeks until early summer.

Seed preparation and soil
- No special pre-treatment required; seeds can be sown dry.
- Choose well-drained, moderately fertile soil. Cosmos prefer lean to average soil; very rich soil encourages floppy growth.
- Position: full sun for best flowering.

How to sow
- Surface-sow or cover very lightly: press seeds into soil or cover with about 2–5 mm of compost or soil.
- Spacing: thin/plant out to 20–30 cm (8–12 in) for tall C. bipinnatus; 10–15 cm (4–6 in) for compact C. sulphureus.
- Germination: 7–21 days at around 18–24 °C; keep soil just moist until seedlings establish.

Practical care
- Watering: keep moist while seedlings establish, then water sparingly—cosmos tolerate drought and too much water reduces flowering.
- Feeding: little or no fertiliser; a light low-nitrogen feed encourages blooms without excessive foliage.
- Pinching: optional. Pinch growing tips when plants reach about 10–15 cm to encourage bushiness and more flowers, but note pinching delays first blooms slightly.
- Support: stake taller varieties in exposed sites to prevent flopping.

Maintenance and problems
- Deadhead spent flowers regularly to prolong bloom period.
- Pests/diseases: generally trouble-free. Watch for slugs on young seedlings and powdery mildew in humid, overcrowded conditions.
- To save seed: let heads dry on plant until brown, then collect seeds and store in a cool dry place.

Quick tips
- Sow directly where plants will flower to avoid root disturbance.
- Use succession sowing for long season of colour.
- Mix varieties for different heights and colours to create natural, airy displays.

With minimal attention, cosmos will reward garden with abundant, long-lasting flowers attractive to bees and butterflies. Tips

    How to sow cosmos Cosmos are easy-to-grow, long-flowering annuals (Cosmos bipinnatus, Cosmos sulphureus) ideal for borders, beds and pollinator-friendly gardens. Follow these steps for reliable results. When to sow - Sow under cover: 4–6 weeks before last expected frost. - Sow outdoors: after all risk of frost has passed and soil has warmed. - In mild climates: sow in autumn for early spring display. - For continuous flowering: sow every 2–3 weeks until early summer. Seed preparation and soil - No special pre-treatment required; seeds can be sown dry. - Choose well-drained, moderately fertile soil. Cosmos prefer lean to average soil; very rich soil encourages floppy growth. - Position: full sun for best flowering. How to sow - Surface-sow or cover very lightly: press seeds into soil or cover with about 2–5 mm of compost or soil. - Spacing: thin/plant out to 20–30 cm (8–12 in) for tall C. bipinnatus; 10–15 cm (4–6 in) for compact C. sulphureus. - Germination: 7–21 days at around 18–24 °C; keep soil just moist until seedlings establish. Practical care - Watering: keep moist while seedlings establish, then water sparingly—cosmos tolerate drought and too much water reduces flowering. - Feeding: little or no fertiliser; a light low-nitrogen feed encourages blooms without excessive foliage. - Pinching: optional. Pinch growing tips when plants reach about 10–15 cm to encourage bushiness and more flowers, but note pinching delays first blooms slightly. - Support: stake taller varieties in exposed sites to prevent flopping. Maintenance and problems - Deadhead spent flowers regularly to prolong bloom period. - Pests/diseases: generally trouble-free. Watch for slugs on young seedlings and powdery mildew in humid, overcrowded conditions. - To save seed: let heads dry on plant until brown, then collect seeds and store in a cool dry place. Quick tips - Sow directly where plants will flower to avoid root disturbance. - Use succession sowing for long season of colour. - Mix varieties for different heights and colours to create natural, airy displays. With minimal attention, cosmos will reward garden with abundant, long-lasting flowers attractive to bees and butterflies.

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