Cosmos Seed Set
complete love for cosmos flowers.
Enjoy a set of blooming Cosmos flowers to bring your garden space to life. Perfect seeds to grow in your pots, a front door or in a garden bed.
- Cut Flowers
- Pollinator-Friendly
- Pot Fans
- Fuss Free
Cosmos Seed Set – Quick Growing Guide
This cosmos seed set offers easy-to-grow, summer-flowering plants perfect for UK gardens. These pollinator-friendly flowers thrive in full sun, producing vibrant blooms ideal for cut flowers. Sow from spring to early autumn for a colourful display that attracts bees and butterflies throughout summer.
How to Sow, Grow and Harvest Cosmos Seed Set
- Sow:March–September, direct or in pots
- Germination:7–14 days
- Grow:Full sun, well-drained soil, thin seedlings to 30cm apart
- Water:Moderate watering; drought tolerant once established
- Harvest:Cut flowers when blooms open for longest vase life
- Best for:Pots, beds, cut flower borders
- Use:Attracts pollinators and brightens summer gardens
Cosmos Fizzy Pink, Cosmos Sensation, Cosmos Seashells Mixed
Enjoy a delightful collection of Cosmos varieties, including Fizzy Pink, Sensation and Seashells Mixed. These open-pollinated, GMO-free seeds are ideal for UK gardens, offering late summer blooms that attract pollinators and brighten any outdoor space.
Delivered within 2-5 working days via our standard delivery
Standard Delivery
For standard delivery, we’ll work with our delivery partners to ensure you receive your delivery within 2-5 working days.
Express Delivery
You can also send this item the next day, just place the order before 11 am and we'll get it sent out the same day to arrive the following day.
Gifting
Want to send this as a gift? We can include a handwritten note, just add what you'd like to write at checkout.
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Grow in Your Garden
Calendar
How to Sow Your Seeds
The Cosmos Seed Set can be started indoors from March to June or sown directly outdoors after the last frost, thriving best in full sun. These annuals are well suited to balconies, containers, and garden beds where they look after themselves with minimal effort. Their preference for well-drained soil ensures vibrant, long-lasting summer blooms.
Sowing
Sow cosmos seeds about 3mm deep into a small tray filled with compost, then water gently and cover with a clear container to maintain warmth. Keeping the seeds on a warm windowsill encourages successful germination during the sowing months of March to June.
Growing
Once seedlings have emerged, thin them out or pot on to provide adequate space for growth, helping to maintain healthy plants that produce stunning cut flowers. Supporting taller stems may be necessary in containers or garden beds to keep the flowers upright throughout their June to October growing season.
Plant care
Water cosmos plants moderately, allowing the soil to dry out slightly between watering to prevent overwatering. Regular deadheading encourages continued flowering and keeps the plants looking their best. Since these flowers are pollinator friendly, maintaining healthy blooms benefits local wildlife during the summer months.
Seeds for a Cosmo Garden
Ideal for pots and borders, these Cosmos seeds produce tall, vibrant flowers that are excellent for cutting. They attract pollinators and bloom from mid to late summer.
- Cut Flowers
- Pollinator-Friendly
- Pot Fans
- Fuss Free
The Cosmo Story
Cosmos flowers were first cultivated by Spanish priests in Mexico, inspired by their harmonious, evenly spaced petals. Native to Mexico and South America, Cosmos are easy-to-grow annuals that bring a touch of the ordered universe to your garden.
| Pet/Baby Safe | Non-toxic. |
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FAQs
Sow indoors from March or outdoors after the last frost in May.
Yes, Cosmos readily self-seed to return year after year.
Plant in full sun with well-drained soil and water moderately.