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Cosmos sulphureus Cosmic Red - Sulfur Cosmos

Cosmos sulphureus Cosmic rouge
Sulfur Cosmos

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Available to order
From 12,50 € 2L/3L pot

Available in 4 sizes

3
From 5,90 € 8/9 cm pot

This plant carries a 6 months recovery warranty

More information

Small floriferous red Cosmos. Excellent in flower beds.
Flower size
5 cm
Height at maturity
30 cm
Spread at maturity
30 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Moist soil
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Best planting time February to April
Recommended planting time March to May
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Flowering time June to August
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Description

The Cosmic range of Cosmos sulphureus are highly floriferous and have a compact habit; smaller than other cosmos, they reach a height of 30cm (12in), and they tolerate windy conditions well.

Whether in pots, borders, or flower beds, these Cosmos start blooming in June and only disappear with the first frost. The red colour of this variety will bring a sunny touch to your garden.

Cosmos is a charming plant with finely cut foliage, and its flowers symbolize innocence. Their very long flowering period will provide nourishment for your summer bouquets and attract butterflies and bees.


Note: Please be aware that our young plug plants are professional products intended for experienced gardeners; upon receipt, transplant and store them in a sheltered place (veranda, greenhouse, cold frame) at a temperature above 14°C (57.2°F) for a few weeks before planting them outdoors once the risk of frost has passed.

 

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

Flowering

Flower colour red
Flowering time June to August
Flower size 5 cm
Good for cut flowers Cut flower blooms

Foliage

Foliage persistence Annual
Foliage colour medium green

Plant habit

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

Botanical data

Genus

Cosmos

Species

sulphureus

Cultivar

Cosmic rouge

Family

Asteraceae

Other common names

Sulfur Cosmos

Origin

Cultivar or hybrid

Product reference4916841

Other Cosmos

3
From 5,90 € 8/9 cm pot

Planting and care

Plant the red Cosmos sulphureus in the ground as soon as the last frost has passed. Fertilizing the soil is unnecessary and harmful as it promotes foliage growth and delays flowering. Beware of excessive watering and slugs. Pinching the plant and picking its flowers improves branching.

Planting period

Best planting time February to April
Recommended planting time March to May

Intended location

Type of use Border, Container
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Planting density 20 per m2
Exposure Sun
Soil pH Any
Soil moisture Moist soil

Care

Overwinter Can be left in the ground

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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