Cosmos 'Sensation Mixed' Seeds
If you only grow one thing from seed this year, make it Cosmos 'Sensation'. This beloved variety produces tall, ferny, airy stems topped with large, open, saucer-shaped flowers in shades of pure white, soft pink, and deep carmine-magenta.
This is the ultimate "low effort, high reward" plant. It grows rapidly to form a large, bushy cloud (up to 1.2m tall) that sways beautifully in the wind. It is a cut-and-come-again flower factory—the more you pick for your vases, the more buds it will produce, often flowering non-stop from June right through to the first frosts of November.
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🌿 Understanding the Plant
Cosmos is a Half-Hardy Annual.
It originates from Mexico, so it loves the sun but cannot survive frost. It grows incredibly fast, reaching full height in just a few months.
The "Treat Mean" Rule: Unusually for a flower, Cosmos hates rich soil. If you plant it in manured ground or feed it fertilizer, it will grow into a giant green monster with zero flowers. Plant it in poor, dry soil and neglect it for the best display!
🌱 Growing Guide: How to Sow and Grow
This is the perfect seed for beginners and children.
Germination:
Sow indoors from March to April, or directly outdoors in May once the soil warms up. Sow seeds 5mm deep. They germinate quickly (7-14 days) at 20°C.
Where to Sow:
They need full sun. They thrive in poor, sandy, or stony soil. They are perfect for filling gaps at the back of a border where other plants have failed.
Care While Growing:
Pinch: When seedlings are 15-20cm tall, pinch out the top growing tip. This makes the plant bushier and stops it from toppling over later.
Deadhead: This is essential. Remove dead flowers weekly to stop the plant setting seed and finishing early.
📋 Plant Specifications
| Latin Name | Cosmos bipinnatus |
| Common Name | Cosmos 'Sensation Mix' |
| Hardiness | H2 (Half-Hardy - Needs Frost Protection) |
| Light Required | Full Sun ☀️ |
| Height | ↕️ 90cm - 120cm (Tall) |
| Spread | ↔️ 50cm |
| Spacing | 🌱 45cm apart |
| Great for | ✂️ Cut Flowers 🐝 Bees & Butterflies 🧱 Back of Border 🌾 Filling Gaps |
| Seed Count | Approx. 100 seeds per packet |
🤝 Perfect Garden Companions
The soft, ferny foliage of Cosmos makes it an excellent "blender" plant:
- 🌻 Tithonia (Mexican Sunflower): The Hot Couple. Tithonia and Cosmos are both from Mexico. Growing the bright orange Tithonia next to the magenta Cosmos creates a vibrant, fiesta-style border that loves the heat.
- 🏰 Larkspur 'Giant Hyacinth': Spikes & Saucers. The tall, rigid spikes of Larkspur provide a structural contrast to the floating, cloud-like habit of the Cosmos.
📅 Sowing & Flowering Calendar
Sow indoors in spring. Plant out in June. Flowers July to November.
| Month | J | F | M | A | M | J | J | A | S | O | N | D |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Sow Indoors | 🟢 | 🟢 | 🟢 | |||||||||
| Sow Outdoors | 🟢 | 🟢 | ||||||||||
| Flowers | 🌸 | 🌸 | 🌸 | 🌸 | 🌸 |
🏆 Officially Recognised Excellence
Cosmos is one of the top plants for pollinators. Its simple, open flowers provide an easy landing pad and rich nectar source for bees and butterflies late into the season.
- Regular price
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£2.50 - Regular price
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- Sale price
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£2.50
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