Cosmos bipinnatus 'Sweet Sixteen'

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") potsand 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.

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 and will be stated on the product page or in your order acknowledgement page and email.

Orders for packets of seed incur a P&P charge of £1.95.
Orders which include any other products will incur a P&P charge of £4.95.
Where an order includes both packets of seeds and other products a maximum P&P charge of £6.90 will apply - regardless of the number of items ordered.

Please see our Delivery / P&P page for further details and details of any surcharges that may apply to certain destinations.

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   New to gardening

   By katrina morris 17-08-2011

   I am new to gardening, and this cosmos has certainly encouraged me. Every seed came up. They are like bushes. I am stunned. Flowered in June (I live in Kent) they are still flowering. Unless you need masses of plants don't plant them all at the same time.

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   Gorgeous

   By Pat Ferguson 05-08-2011

   bought these last year and sowed them quite late this spring (2011). Tall but very sturdy plants which started flowering late July. Most of them are true to the picture but a very few are a solid dark pink/purple, blending very well with the bicolour shown. Bought another packet already to sow next spring I like them so much.