Cosmos bipinnatus ‘Sensation Purity’ | White Cosmos | Strong stems

Cosmos bipinnatus ‘Sensation Purity’ | White Cosmos | Garden Cosmos Seeds

Cosmos bipinnatus ‘Sensation Purity’ is a classic, elegant variety cherished for its pure white, daisy-like blooms that bring lightness and grace to any garden. With tall, feathery foliage and long, strong stems, it’s a favorite among both gardeners and florists for its airy texture and long vase life.

This easy-to-grow annual produces abundant flowers from early summer until the first frost, making it a must-have for cutting gardens, cottage borders, and naturalistic plantings. ‘Sensation Purity’ thrives in full sun and well-drained soil, and its delicate white blooms pair beautifully with almost any color palette — from soft pastels to bold summer shades.

• Botanical name: Cosmos bipinnatus
• Variety: ‘Sensation Purity’
• Common name: Garden Cosmos, White Cosmos
• Type: Half-hardy annual
• Height: 90–120 cm
• Spread: 30–45 cm
• Flower size: 8–10 cm
• Blooming period: June–October
• Position: Full sun
• Soil: Light, well-drained soil
• Vase life: 7–10 days

• Pollinator friendly: Yes – attracts bees and butterflies

How to Sow & Grow

When to Sow:

• Indoors: March–April
• Outdoors: May, after the last frost

How to Sow:

• Sow seeds 0.5 cm deep in moist, well-drained compost.
• Keep at 18–22°C for germination (7–14 days).
• When seedlings are large enough to handle, transplant to individual pots or directly into the garden after frost.

Plant Spacing: 30–45 cm
Pinching: Pinch young plants at 20–25 cm tall to encourage branching.

Care Tips:

• Deadhead regularly to prolong flowering.
• Water moderately – cosmos prefers drier soil once established.
• Support may be needed for tall stems in windy locations.

Why Grow ‘Sensation Purity’?

✔ Elegant, pure-white blooms – timeless and versatile
✔ Excellent for bouquets and cut-flower arrangements
✔ Long, graceful stems and delicate foliage
✔ Easy to grow and pollinator-friendly
✔ Blooms continuously throughout summer and early autumn