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Cosmos bipinnatus 'Sea Shells'


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From 4 ratings

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Key information

Plant type

Hardy annual

Flower colour





Half hardy

Skill level


Cosmos 'Sea Shells'

Plant details

This rather special cosmos has fluted petals, each rolled round a tube, like a sea shell. The petals splay out from a button like centre. It has ferny foliage and is excellent in borders and useful for cutting.

Family: Asteraceae

Genus: Cosmos

Species: bipinnatus

Cultivar: Sea Shells

Plant type: Hardy annual

Flower colour: Pink

Foliage colour: Mid-green

Feature: Flowers

Sun exposure: Full sun

Soil: Well-drained/light, Acidic, Chalky/alkaline

Hardiness: Half hardy

Skill level: Experienced

Height: 105cm

Spread: 90cm

Time to plant seeds: March to April

Flowering period: July to October

Reader reviews


This year is my first time at growing Cosmos 'Seashells', the seedlings have so far grown into healthy sturdy young plants, promising lots of radiant blooms.

jean linsley

at what stage do you plant out & they are big enough not to get eaten..I landed up with just one plant this year...

Flower bird

I love Cosmos, I think they are absolutely gorgeous, I grew some last year and wanting to grow a lot more this year.....they are stunning.


I have a Cosmos in a pot,looks healthy but no sign of a flowering bud,can anyone help with this or am I been impatient?

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