Thompson & Morgan

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Cosmos sulphureus 'Brightness Mixed'

Half-hardy Annual

 Customer Rating

Possibly the most free-flowering cosmos of this type. Dwarf and bushy plants are covered with flowers in a delightful mixture of gold, lemon, orange and red from early summer through to the autumn frosts. Spectacular when planted towards the front of annual borders or in containers.

Ideal For:
patio, wildlife gardens, cut flower garden
Flowering Period:
July, August, September, October
Sowing Months:
March, April, May
full sun
    • 1 packet (100 cosmos seeds)

    • Despatch: Within 1 days
    • £2.99

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.

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.

Despatch: Within 24 hours applies to orders placed online from Sunday to Thursday. Orders placed online on Friday or Saturday will be despatched on Monday. Please note that for Bank Holiday weekends, orders placed Friday to Sunday will be despatched on Tuesday.

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.

  1. Cosmos Brightness Mixed

    By Rosemary Martin 07-12-2013

    These are gorgeous colourful small plants, ideal for front of the border. Very easy to germinate and grow on. Seems to be rainproof too.

  2. cosmos brightness

    By Rognvald Blance 30-07-2013

    easy to grow and wonderful bright colours

  3. cosmos brightness mixed

    By louise jacobs 24-09-2011

    brought these lovely little flowers on a whim.the seeds where really easy to germinate and i had no problems growing them on before planting them out,where they have gone on to produce fantastic plants in a range of really bright colours,they really shine out from my borders i will definatley be ordering these again as they have flowered again and again after dead heading

  4. cosmos brightness

    By joslin meeks 20-09-2011

    lovely colours especialy good with other orange and red flowers in a warm border.they just keep flowering,are easy to grow,will grow them again.

  5. Cosmos Brightness mixed

    By Lesley Willoughby 12-09-2011

    Small plants that fit in well in between other plants in garden & containers. Small, bright colours flowering late summer and into autumn. Don't think I made the most of them this year, as they certainly like full sun, but I will grow them again as they were very easy to germinate

  6. cosmos brightness

    By rachel eadie 11-09-2011

    these pretty little flowers really have the right name, you can really spot them in the border even on a dull day, especially when grown with some nigella the colours mixed beautifully, will be growing these again. rachel eadie.

  7. Beautiful

    By Nicola Jones 11-09-2011

    These flowers are beautiful at the moment and such a mixture of colours...I love them and will definately be buying more seed.

  8. Cosmos Brightness Mixed

    By Rita Fox 11-09-2011

    Lovely plants - the ones that survived that is - they looked very healthy young plants grown lovingly by me from seed but when I planted them out in my pots most of them were eaten by slugs and snails. I do try to be environmentally kind in my garden but next year I am going to be ruthless with the slug pellets. I will try again next year.

  9. Cosmos Brightness mixed

    By Pat Gornall 11-09-2011

    I was surprised at how small these plants turned out to be, having always grown C. bipinnatus before. They grew easily from seed but seemed to take ages to establish once potted on. However, once blooming had started they redeemed themselves and have flowered their little socks off! The best thing about them is that they are irresistible to bees - continually smothered in them. I'll certainly be growing them again.

  10. cosmos brightness mxd

    By linda hirst 30-08-2011

    lovely array of colours, easy to grow and looked really pretty at the front of my borders will be growing again

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