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Cosmos bipinnatus Sensation Pinkie seeds - Garden Cosmos

Cosmos x bipinnatus Sensation Pinkie (Sensation series)
Garden Cosmos, Mexican Aster

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A tall variety, with simple, delicious, soft pink flowers with a yellow heart, which suits this airy, easy to grow annual. It tolerates all growing conditions and consistently delivers an abundance of flowers that enliven country borders in summer and autumn. A variety awarded with an Award of Garden Merit.
Flower size
9 cm
Height at maturity
1 m
Exposure
Sun
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Sowing period February to April
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Flowering time July to September
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Description

Cosmos bipinnatus Sensation Pinkie, recipient of a Royal Horticultural Society Award of Garden Merit, is a tall variety from the Sensation series, providing interesting cultivars. It has large, bright 9 cm diameter flowers, soft pink with a yellow centre, at the top of elegant stems, reaching a height of 1 m, as light as its finely cut foliage. Sow it directly in the ground, in a rustic flower bed. This undemanding annual plant is as easy to sow as it is to grow.

Cosmos bipinnatus is an annual species native to Mexico and the extreme southern United States. This not very hardy annual plant, related to Dahlias, belongs to the Asteraceae family. It displays a characteristic inflorescence in a head and particularly fine foliage, described as pinnately dissected, reminiscent of fennel. Each plant from the Sensation Pinkie selection quickly forms clumps of 90 cm to 1 m in height, for a width of 50 cm. Flowering starts in June-July, and lasts until October, only stopping with the first frosts. The flower heads measure 9 cm in diameter and are composed of petals of various colours. The flower centre consists of a golden disc. They attract numerous insects and butterflies, including the Monarch. The foliage is finely cut into thread-like segments, barely 0.5 to 1 mm wide, and is slightly and pleasantly scented.

Cosmos is very easy to grow, suitable for beginners to sow directly in the ground. Its flowering is foolproof: poor soil, heat, humidity. This tall plant brings height to flower beds and lightness to the heavier blooms of perennials. During flowering, the plant may sag under its weight, due to wind or showers. This issue can be resolved by grouping the stems so that the leaves cling together. Sensation Pinkie can be used in rustic flower beds, mixed with toadflaxes, grasses, Bee Blossoms, Crocosmias, Verbena bonariensis, or perennials that love the sun as much as it does, bidens and rudbeckias. Its flowers have a very good vase life.

Eco-friendly gesture: Sowing a honey-producing plant like Cosmos in your garden will attract pollinating insects and butterflies throughout the summer. At the end of the season, let the last flowers produce their seeds, which are particularly appreciated by birds. This will encourage them to settle in your garden and play an important role in its ecosystem.

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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 1 m
Spread at maturity 30 cm
Growth rate fast

Botanical data

Genus

Cosmos

Species

x bipinnatus

Cultivar

Sensation Pinkie (Sensation series)

Family

Asteraceae

Other common names

Garden Cosmos, Mexican Aster

Origin

Cultivar or hybrid

Product reference21857

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Planting and care

Sow the seeds of Cosmos Sensation Pinkie in full sun or partial shade, in moderately fertile, neutral, well-drained and humus-bearing soil from March to May for a flowering period from July to autumn. This plant is easy to grow but can be prone to aphids. Cosmos Sensation Pinkie enjoys watering in the summer but remains a fairly modest plant.

Sowing period

Sowing period February to April

Intended location

Suitable for Meadow, Woodland edge
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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