Cosmos bipinnatus 'Double Click Rose Bon Bon' is a robust Half-Hardy Annual (H2). Native to the sun-baked highlands of Mexico, it is biologically programmed to thrive in full sun and surprisingly lean, dry soil. The 'Double Click' series represents a major breakthrough in modern breeding, offering 25-40+ petals per head to create the most voluminous texture possible in a Cosmos.

The "Starvation" Rule: One of the most critical aspects of Cosmos biology is its dislike of rich soil. If grown in manured ground or treated with nitrogen-heavy fertilizers, the plant will put all its energy into massive green foliage, often failing to produce any flowers at all. For the best "Bon Bon" display, plant them in the poorest, leanest part of your garden and avoid feeding entirely.

Professional Cut Flower Status: Because 'Double Click' varieties are fully double, they possess a superior vase life compared to single-flowered Cosmos. The structural density of the ruffled petals helps the flower hold its shape for 7-10 days after cutting, making it a favourite for high-end wedding floristry and summer posies.

Cosmos is one of the easiest and fastest plants to raise from seed, making it a perfect project for beginners or children.

How to Sow:
Sow indoors from March to May for early summer blooms, or direct sow outdoors in May or June once the soil has warmed. Sow seeds 5mm deep into moist seed compost. Germination is exceptionally rapid, typically occurring within 7-14 days at a constant temperature of 18-20°C. If sowing indoors, a bright windowsill provides enough light for healthy early growth.

Where to Plant:
They demand full sun and thrive in poor, well-drained soil. They are the ideal solution for filling large gaps at the back of a sunny border where their tall, architectural habit can act as a seasonal screen. Space plants 45-50cm apart to allow their airy, bushy habit to develop fully without overcrowding.

Ongoing Care:
To encourage a sturdy, multi-stemmed plant, pinching is essential. When seedlings reach 20cm tall, pinch out the top growing tip; this prevents the plant from becoming too "top-heavy" and toppling over in late summer storms. Weekly deadheading is also vital—the more you cut for the vase, the more the plant will reward you with fresh ruffled blooms until the first October frosts.

The dense, rose-like texture of 'Rose Bon Bon' acts as a magnificent focal point that pairs spectacularly with airy available partners from our range:

• ☁️ Ammi majus: The Texture Match. The lacy, frothy white umbels of Ammi majus (Bishop's Flower) provide a soft, neutral backdrop that allows the heavy, ruffled pink heads of 'Rose Bon Bon' to truly take centre stage. This is a quintessential florist's pairing for romantic summer arrangements.
• 💜 Salvia viridis 'Blue': The Structural Contrast. The upright, deep indigo-blue bracts of this Salvia provide a brilliant structural counterpoint to the billowing, cloud-like habit of the double Cosmos. The rich blue tones help ground the soft, vintage pink of the 'Rose Bon Bon' petals.

Sow indoors in spring or direct sow once the soil warms for an unstoppable harvest of sumptuous, double rose-pink blooms from mid-summer until the autumn frosts.