Cosmos 'Purity White' Seeds
Cosmos bipinnatus ‘purity’
Angelic white blooms, ideal as cut flowers. Cosmos bipinnatus ‘Purity’ brings that bright, easy English-garden feel — crisp white petals on apple-green foliage, flowering for weeks in sunlit borders and pots.
Approx 80 seeds
- Cut Flowers
- Pollinator-Friendly
- Pot Fans
- Fuss Free
Cosmos 'Purity White' Seeds – Quick Growing Guide
Cosmos 'Purity White' seeds produce elegant white flowers ideal for brightening gardens and attracting pollinators. Sow from March to September for blooms in summer and autumn. These easy-to-grow plants thrive in full sun with moderate watering, perfect for cut flowers and wildlife-friendly gardens.
How to Sow, Grow and Harvest Cosmos 'Purity White' Seeds
- Sow:March–September, direct or in pots
- Germination:7–14 days
- Grow:Full sun, well-drained soil, thin seedlings to 30cm apart
- Water:Moderate; allow soil to dry slightly between watering
- Harvest:Cut flowers when buds open for longest vase life
- Best for:Beds, borders, cut flower gardens, pollinator-friendly spaces
Cosmos 'Purity White' offers delicate, angelic blooms perfect for cut flowers. These easy-to-grow annuals thrive in UK gardens, adding a fresh, airy touch to borders or pots while attracting pollinators throughout late summer and autumn.
Delivered within 2-5 working days via our standard delivery
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Grow in Your Garden
Calendar
How to Grow
Start Cosmos ‘Purity’ seeds indoors from March to June in a sunny spot, as they prefer warmth to germinate well. These annuals thrive in containers or garden beds with well-drained soil, making them ideal for balconies or borders.
Sowing
Sow the white cosmos seeds thinly on good seed compost and cover lightly, keeping the soil moist at all times to encourage germination. Place the tray in a warm, sunny location to ensure successful sprouting.
Growing
Once seedlings appear, thin them out to prevent overcrowding and transplant into 30 cm pots or garden beds with ample space for growth. Supporting the plants is generally unnecessary as Cosmos ‘Purity’ grows well in open areas from July to October, reaching a manageable size for containers and borders.
Plant care
Water the plants moderately, allowing the soil to dry slightly between watering to avoid over-saturation. Deadhead regularly to promote continuous flowering throughout the late summer and autumn months. As they look after themselves well, minimal feeding is needed, but ensure they remain in sunny positions for best performance.
About Cosmos 'Purity White'
Elegant and effortless, Cosmos bipinnatus ‘Purity’ produces clouds of crisp white flowers on tall, airy stems. Ideal for borders, pots, and cut flower gardens, these fast-growing annuals thrive in full sun and poor soils. Highly pollinator friendly, Cosmos Purity attracts bees and butterflies all summer long.
- Cut Flowers
- Pollinator-Friendly
- Pot Fans
- Fuss Free
Eventual height & spread
History of Cosmos 'Purity White'
The name ‘Cosmos’ comes from the Greek for ‘ordered universe’, reflecting the flower’s perfectly balanced petals. Spanish priests first cultivated Cosmos in mission gardens, admiring their harmonious form.
| Other Names | Garden cosmos and Mexican aster |
|---|---|
| Pet/Baby Safe | Non-toxic |
FAQs
No special care is needed. Cosmos ‘Purity White’ is easy to grow from seed, thriving in full sun and well-drained soil. Avoid over-feeding, as poorer soil helps produce more flowers rather than foliage.
Yes. Cosmos ‘Purity White’ is highly pollinator-friendly, attracting bees, butterflies and other beneficial insects throughout the summer flowering season.
Cosmos is an annual, meaning it completes its life cycle in one season. However, it often self-seeds, so new plants may appear the following year if seed heads are left to mature.
Yes — ‘Purity’ is a white-flowering cultivar of Cosmos bipinnatus, grown for tall, airy stems and reliable cut flowers in UK summer gardens.