100 seeds 030013 £1.95 In stock
When in stock, please allow up to 5 working days for despatch.
5 seedlings 510295-5 £6.50 Delivery mid April
When in stock, please allow up to 4-6 weeks for despatch. 
10 seedlings 510295-10 £11.95 Delivery mid April
When in stock, please allow up to 4-6 weeks for despatch. 

Or buy this as part of our Ultimate Cosmos Mix and Dark Cosmos Collection.

More Details

Large, open buttercup-like flowers of carmine pink with delicate, feathery foliage. Beautiful, tall and airy.

Cosmos last 10 days in the vase, produce at least two buckets of cut flowers a week from a 1 x 1m patch, and do so from late June until November. So that's nearly 50 buckets of flowers in one season from a small patch. They are impossible to beat.

Genus Cosmos
Group/Species bipinnatus
Variety Dazzler
Type Half-Hardy Annual
Common Name Cosmos
Border Position Cutting Garden
Soil Type Broad Tolerance
Scent Unscented
Site Full Sun
Moisture Moist but Well-drained
Height 90cm (36in)
Spacing 45cm (18in)
Sowing, Seeds, Planting Sow under cover in mid spring and plant out after last frosts, or direct sow early May. Grow seedlings on in individual pots or modules until large enough to plant out. Gradually acclimatise to outdoor conditions for 7-10 days before transplanting into the garden after all risk of frost has passed.
Care Tips Pinch out tips at 15-20cm to encourage bushier plants. Stake and tie Cosmos plants if necessary during the growing season, water regularly and dead-head to prolong the flowering season.
Flowering July - October
Vase Life 7-10 days, no conditioning needed. Pick fresh straight into water, just as the buds are about to bloom, and do not pick in the heat of the day. Deadhead the main blooms that are drooping and going over after about a week. Place out of direct sunlight.
Harvesting Flower production: 4-5 months.
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  • Sow Under Cover/Plant Indoors
  • Direct Sow/Plant Outdoors
  • Flowers/Harvest
Advice & Videos
How to sow, grow and stake cosmos

Sarah shows you different methods she uses to sow cosmos and stake them, highlighting her favourite varieties for using in the vase.

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How to get summer colours in an autumn garden

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How to plant and grow cosmos

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Direct sowing seeds

Learn how to get great results when direct sowing hardy annual seeds.


Plant Delivery - When in stock, please allow up to 4-6 weeks for despatch. 

Seeds Delivery - When in stock, please allow up to 5 working days for despatch.

Click here to find out more information about our delivery rates and times.

Cosmos bipinnatus 'Dazzler' reviews

* * * * * Average based on 26 reviews

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Reviewed 6th January 2021 by Valerie

I have received plants and garden accessories from Sarah Raven for several years. Everything has been delivered on time, well packed and in good condition.

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Reviewed 7th August 2019 by Mrs Longman

Plants look very healthy and are very tall and bushy. Some of the plants have no flowers at all, the others just one or two. I bought these hoping to have colour in my border all summer long ( I've purchased Cosmos many times from local nurseries with great results). Very disappointed

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Reviewed 31st July 2019 by Miss Wilson

Stunning colour and very floriferous. Bees especially love them. They also make a very nice arrangement in a vase but I don’t like to pick too many as saving the blooms for the insects.

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Reviewed 31st July 2019 by Mrs Richards

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Reviewed 31st July 2019 by Geoffrey

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Reviewed 31st July 2019 by Lorna

These seedlings thrived, but were an experiment and won't buy again as very compact and lack grace of taller Cosmos varieties.

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Reviewed 31st July 2019 by Antonia

Good colour and growth. No re more!

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Reviewed 31st July 2019 by Niall

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Reviewed 31st July 2019 by Elaine

Have no idea yet as plants are very tall 2-3 feet high but no sign of any flower buds but they look healthy enough

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Reviewed 31st July 2019 by Diana

Good robust plants.easy to grow.

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Reviewed 31st July 2019 by Joyce

These didn't do as well as "Purity" but still lots of flowers.

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Reviewed 31st July 2019 by Alan

Very poor. Unreliable performance.

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Reviewed 15th November 2018 by Marion

Very good quality plants I’ve been pleased with everything I’ve ordered from you , my Dahlias are still flowering!

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Reviewed 14th November 2018 by Julie

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Reviewed 14th November 2018 by Melissa

I killed them 😔 they arrived when I was away and when I went to pick them up they had died.....

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Reviewed 7th November 2018 by Linda

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Reviewed 7th November 2018 by Irene

Superb plants, grew well and gave a fantastic display.

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Reviewed 19th September 2018 by Linda

Beautiful, still going strong !

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Reviewed 19th September 2018 by Susie

Good service. Beautiful, healthy plants. Still going strong!

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Reviewed 19th September 2018 by Arthur

All plants grew well and have flowered prolifically. Many hve grown to over 6 ft tall. with multiple flowers throughout the summer.

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Reviewed 14th September 2018 by Hilary

Good height, wonderful non fading colour, and still flowering very well, even those in partial shade.

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Reviewed 12th September 2018 by Rebecca

Great seedlings. Have grown into lovely healthy plants. Lots of flowers.

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Reviewed 12th September 2018 by Claire

Unfortunately, I received my cosmos late. I had not received them by the date promised and after getting in touch was informed that the delivery had gone astray. So I was sent a new delivery. Consequently, I planted them in my south-facing garden later than I would have liked. I have had healthy foliage but still no flowers. I’m wondering whether they will flower before the frosts !

Reply from the Sarah Raven Team:

"Thank you for your feedback. we are sorry to hear that your replacement seedlings have failed to flower and can only presume that the hot weather we experience has delayed them. We have made a note on your account, please contact our Customer Services team in the spring if you wish to try another set."

Posted 7th November 2018

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Reviewed 12th September 2018 by Penelope

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Reviewed 29th August 2018 by Tania

True Dazzlers

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Reviewed 7th July 2017 by Kaz Forecast

This is the first time I have grown Cosmos from seed - these are so easy to grow and stunning to look at. They will not go unnoticed by anyone and of course the beautiful feathery foliage is an added bonus. I am absolutely delighted with them. As I only have heavy clay meadow grass - all of my seeds and plants are grown in pots and they look amazing plus being able to move them around adds to the changing structure.