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Flower seeds to sow outside in September

Shop flower seeds to sow outside in with confidence

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Used at RHS Chelsea Flower Show
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Showing Seeds Flower seed Sowing month outside : September clear all
111 items
Alcea rosea Halo Apricot (Halo Series)

New

Alcea rosea 'Halo Apricot' (Halo Series)
£3.99 £2.99
available to order from autumn
Alcea rosea Single mixture

25% off

Alcea rosea 'Single mixture'
£2.49 £1.87
approx 75 seeds
Ammi majus

Best Seller

25% off

Ammi majus
From £2.17
approx 500 seeds
0.75 star 1 star 1 star 1 star 1 star 4.7 5 6 (6)
Angelica gigas

25% off

Angelica gigas
From £2.99
9cm pot
2 litre pot
3 × 9cm pots
6 × 9cm pots
+ 1 more available
0.5 star 1 star 1 star 1 star 1 star 4.5 5 34 (34)
Antirrhinum majus Admiral Crimson

25% off

Antirrhinum majus 'Admiral Crimson'
£4.49 £3.37
approx 50 seeds
Antirrhinum majus Madame Butterfly Bronze White

25% off

Antirrhinum majus 'Madame Butterfly Bronze White'
£3.49 £2.62
approx 25 seeds
Antirrhinum majus Madame Butterfly Pink
Antirrhinum majus 'Madame Butterfly Pink'
£4.49 £3.37
available to order from autumn
Antirrhinum majus Madame Butterfly Red
Antirrhinum majus 'Madame Butterfly Red'
£3.49
approx 25 seeds
Antirrhinum majus Potomac Lavender

25% off

Antirrhinum majus 'Potomac Lavender'
£5.49 £4.12
approx 50 seeds
Aquilegia oxysepala
Aquilegia oxysepala
£3.99
approx 30 seeds
0 star 0 star 0 star 0 star 1 star 1.0 5 1 (1)
Aquilegia vulgaris Pink Petticoat

New

Aquilegia vulgaris 'Pink Petticoat'
£3.99 £2.99
available to order from autumn
Aquilegia vulgaris William Guiness

25% off

Aquilegia vulgaris 'William Guiness'
£3.99 £2.99
approx 40 seeds
Astrantia major
Astrantia major
£2.99 £2.24
available to order from autumn
Award-winning sweet pea collection
Award-winning sweet pea collection
£10.27 £7.48
available to order from autumn
Bright and bold sweet pea collection

25% off

Bright & bold sweet pea collection
£9.97 £7.48
1 × collection
Briza maxima

25% off

Briza maxima
£2.69 £2.02
approx 225 seeds
Calendula officinalis

25% off

Calendula officinalis
£2.79 £2.09
approx 100 seeds
0.25 star 1 star 1 star 1 star 1 star 4.3 5 4 (4)
Calendula officinalis Indian Prince (Prince Series)

25% off

Calendula officinalis 'Indian Prince' (Prince Series)
£2.69 £2.02
approx 100 seeds
0.75 star 1 star 1 star 1 star 1 star 4.8 5 5 (5)
Calendula officinalis Orange King

25% off

Calendula officinalis 'Orange King'
£2.49 £1.87
approx 150 seeds
Calendula officinalis Sherbet Fizz

25% off

Calendula officinalis 'Sherbet Fizz'
£2.99 £2.24
approx 100 seeds
0 star 1 star 1 star 1 star 1 star 4.0 5 1 (1)
Calendula officinalis Snow Princess

25% off

Calendula officinalis 'Snow Princess'
£2.89 £2.17
approx 100 seeds
Centaurea cyanus

25% off

Centaurea cyanus
£3.29 £2.47
approx 200 seeds
0.5 star 1 star 1 star 1 star 1 star (2)
Centaurea cyanus Black Ball

25% off

Centaurea cyanus 'Black Ball'
£2.89 £2.17
approx 300 seeds
Centaurea cyanus Blue Ball

25% off

Centaurea cyanus 'Blue Ball'
£2.99 £2.24
approx 325 seeds
Centaurea cyanus Classic Fantastic
Centaurea cyanus 'Classic Fantastic'
£2.99 £2.24
available to order from autumn
Centaurea cyanus Classic Magic
Centaurea cyanus 'Classic Magic'
£2.89
approx 100 seeds
Centaurea cyanus Polka Dot Series

25% off

Centaurea cyanus 'Polka Dot Series'
£2.49 £1.87
approx 325 seeds
Centaurea cyanus White Ball

25% off

Centaurea cyanus 'White Ball'
£2.49 £1.87
approx 300 seeds
Dark and rich sweet pea collection
Dark & rich sweet pea collection
£9.37 £7.03
available to order from autumn
Daucus carota Dara

25% off

Daucus carota 'Dara'
£3.29 £2.47
approx 50 seeds
0 star 0 star 0.5 star 1 star 1 star (2)
Eschscholzia californica Apricot Chiffon (Thai Silk Series)

New

Eschscholzia californica 'Apricot Chiffon' (Thai Silk Series)
£2.99 £2.24
available to order from autumn
Eschscholzia californica Carmine King

New

25% off

Eschscholzia californica 'Carmine King'
£2.79 £2.09
approx 500 seeds
Eschscholzia californica Ivory Castle

25% off

Eschscholzia californica 'Ivory Castle'
£2.99 £2.24
approx 500 seeds
Eschscholzia californica Mission Bells

25% off

Eschscholzia californica 'Mission Bells'
£2.99 £2.24
approx 425 seeds
0 star 1 star 1 star 1 star 1 star (1)
Eschscholzia californica Orange King

25% off

Eschscholzia californica 'Orange King'
£2.19 £1.64
approx 500 seeds
1 star 1 star 1 star 1 star 1 star (1)
Eschscholzia californica Peach Sorbet

25% off

Eschscholzia californica 'Peach Sorbet'
£2.99 £2.24
approx 150 seeds
0 star 0 star 0 star 0 star 1 star (1)
Eschscholzia californica Pink Champagne

New

Eschscholzia californica 'Pink Champagne'
£2.99 £2.24
available to order from autumn
Eschscholzia californica Thai Silk Appleblossom Chiffon (Thai Silk Series)

New

Eschscholzia californica 'Thai Silk Appleblossom Chiffon' (Thai Silk Series)
£2.99 £2.24
available to order from autumn
Eschscholzia californica Thai Silk Rose Chiffon

New

25% off

Eschscholzia californica 'Thai Silk Rose Chiffon'
£2.99 £2.24
approx 150 seeds
Viola tricolor

25% off

heartease
£2.79 £2.09
approx 75 seeds
Helichrysum bracteatum Salmon Rose

New

25% off

Helichrysum bracteatum 'Salmon Rose'
£2.79 £2.09
approx 400 seeds
Helichrysum bracteatum Snow White

New

25% off

Helichrysum bracteatum 'Snow White'
£2.79 £2.09
approx 400 seeds
Heritage sweet pea seed gift box

25% off

Heritage sweet pea seed gift box
£22.99 £17.24
gift set
Hordeum jubatum

25% off

Hordeum jubatum
£2.89 £2.17
approx 100 seeds
Oreomecon nudicaulis

25% off

Icelandic poppy mixed | Papaver nudicaulis
£3.49 £2.62
approx 300 seeds
Lathyrus Prince of Orange

New

25% off

Lathyrus 'Prince of Orange'
£3.99 £2.99
approx 20 seeds
Lathyrus odoratus Almost Black
Lathyrus odoratus 'Almost Black'
£2.99 £2.24
available to order from autumn
Lathyrus odoratus Charlie's Angel
Lathyrus odoratus 'Charlie's Angel'
From £2.62
available to order from autumn
0.25 star 1 star 1 star 1 star 1 star (5)
Lathyrus odoratus Cupani

25% off

Lathyrus odoratus 'Cupani'
From £2.84
approx 20 seeds
0 star 1 star 1 star 1 star 1 star (1)
Lathyrus odoratus Dorothy Eckford
Lathyrus odoratus 'Dorothy Eckford'
£3.29 £2.47
available to order from autumn
Lathyrus odoratus Eclipse
Lathyrus odoratus 'Eclipse'
£2.99 £2.24
available to order from autumn
Lathyrus odoratus Gwendoline

25% off

Lathyrus odoratus 'Gwendoline'
£2.89 £2.17
approx 20 seeds
1 star 1 star 1 star 1 star 1 star (6)
Lathyrus odoratus High Scent

25% off

Lathyrus odoratus 'High Scent'
£4.79 £3.59
approx 20 seeds
Lathyrus odoratus Jilly

25% off

Lathyrus odoratus 'Jilly'
£2.99 £2.24
approx 20 seeds
Lathyrus odoratus Karen Louise
Lathyrus odoratus 'Karen Louise'
£3.49 £2.62
available to order from autumn
1 star 1 star 1 star 1 star 1 star (1)
Lathyrus odoratus Lisa Marie
Lathyrus odoratus 'Lisa Marie'
£3.89 £2.92
available to order from autumn
Lathyrus odoratus Matucana

25% off

Lathyrus odoratus 'Matucana'
From £2.54
approx 20 seeds
0.25 star 1 star 1 star 1 star 1 star (10)
Lathyrus odoratus Midnight

25% off

Lathyrus odoratus 'Midnight'
From £2.47
approx 20 seeds
1 star 1 star 1 star 1 star 1 star (2)
Lathyrus odoratus Mollie Rilstone

25% off

Lathyrus odoratus 'Mollie Rilstone'
From £2.47
approx 20 seeds
Lathyrus odoratus Mrs Bernard Jones
Lathyrus odoratus 'Mrs Bernard Jones'
£3.29 £2.47
available to order from autumn
1 star 1 star 1 star 1 star 1 star (1)
Lathyrus odoratus Painted Lady

25% off

Lathyrus odoratus 'Painted Lady'
From £2.62
approx 20 seeds
0 star 0 star 1 star 1 star 1 star (1)
Lathyrus odoratus Spencer Waved Mixed

25% off

Lathyrus odoratus 'Spencer Waved Mixed'
From £2.99
approx 35 seeds
Lathyrus odoratus Top Hat

25% off

Lathyrus odoratus 'Top Hat'
From £2.24
approx 20 seeds
Lathyrus odoratus White Frills
Lathyrus odoratus 'White Frills'
£3.99 £2.99
available to order from autumn
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Our flower seeds to sow outside in September collection is designed to make growing from seed feel simple, useful and rewarding. These flower seeds help you add colour, texture and seasonal interest, whether you are filling gaps in a border, refreshing containers or planning a more productive cutting patch. Starting with seed is a flexible way to grow more for your money, and it gives you plenty of choice when shaping the look and feel of your outdoor space.

Choose from carefully selected varieties that suit different spaces, styles and levels of experience. You can look for reliable favourites, easy options for quick results, or more distinctive choices to add interest through the season. Clear product details help you understand where each seed works best, when to sow, and what kind of result to expect, so it is easier to choose with confidence.

At Crocus, our range is curated by people who understand real gardens and the practical decisions gardeners make. From popular flower seeds to more specialist choices, we focus on quality, useful information and convenient delivery to your door. Browse the range, pick the seeds that suit your plans, and start growing a garden that feels more colourful, personal and well put together.

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© Crocus.co.uk Ltd 2026. All rights reserved.