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Cosmos bipinnatus - Kew Pollination Collection

This product is produced and supplied in association with Thompson & Morgan

These packets are produced in association with Kew Gardens

A bright and airy display at the back of borders

Loved by pollinating insects

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Description Sowing More Info Delivery

Thompson & Morgan is delighted to work alongside the Royal Botanic Gardens, Kew to offer special seed collections to home gardeners. This Kew Pollinators Collection has been specially selected by The Royal Botanic Gardens, Kew.

Tall, ferny foliage topped with bright, single blooms that range from white glacial white to carmine pink. This cheery annual provides a bold splash of colour to the back of borders, mingling beautifully with summer flowering perennials. Their strong stems and good vase life make Cosmos an excellent choice as a cut flower, but pollinating insects will thank you for leaving some in the border where they provide a valuable source of nectar. Cosmos bipinnatus is quick and easy to grow, virtually looking after itself once established. Height: 120cm (47"). Spread: 60cm (24").


1 Packet (200 Seeds) (KB7561)

Sow Cosmos seed from March to May at a depth of 3mm (⅛") in a good quality seed compost, and cover the seeds with a very fine sprinkling of vermiculite. Place the seed tray in a propagator at a temperature of 18-25C (64-77F) or seal it inside a polythene bag. Keep the soil damp but not wet. Do not exclude light as this aids germination which usually takes 7-15 days.

When seedlings are large enough to handle, transplant into 7cm (3") pots and grow them on in cooler conditions until large enough to plant outdoors. When Cosmos plants are well grown and all risk of frost has passed, acclimatise them to outdoor conditions over 7 to 10 days. Transplant outdoors in full sun in any moist, well drained soil at a distance of 45cm (18") apart. Pinch out the growing tip of each stem when transplanting to encourage stems to branch and produce more Cosmos flowers.

When growing Cosmos plants, water regularly until they are fully established. Deadhead faded Cosmos flowers regularly to encourage more blooms to be produced throughout the summer.

Seeds and garden supplies will normally be delivered within the time period stated against each product as detailed above. Plants, bulbs, corms, tubers, shrubs, trees, potatoes, etc. are delivered at the appropriate time for planting or potting on. Delivery times will be stated on the product page above, or in your order acknowledgement page and email.

Orders for packets of seed incur a delivery charge of £2.99.

Orders which include any other products will incur a delivery charge of £6.99.

Where an order includes both packets of seeds and other products, a maximum delivery charge of £7.99 will apply - regardless of the number of items ordered.

Large items may incur a higher delivery charge - this will be displayed in your shopping basket.

Please see our Delivery page for further details, and more information on different charges that may apply to certain destinations.

For more information on how we send your plants please visit our Helpful Guide on plant sizes.

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