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Semi hardy flower seeds

Shop semi hardy flower seeds and grow confident colour from seed

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Used at RHS Chelsea Flower Show
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Showing Seeds Flower seed Hardiness : Semi hardy clear all
47 items
Muhlenbergia capillaris

Best Seller

25% off

Muhlenbergia capillaris
From £2.99
approx 20 seeds
9cm pot
2 litre pot
3 × 9cm pots
+ 2 more available
1 star 1 star 1 star 1 star 1 star 4.9 5 8 (8)
Dahlia merckii

New

25% off

Dahlia merckii
From £4.49
approx 10 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 2 (2)
Antirrhinum majus Admiral White

25% off

Antirrhinum majus 'Admiral White'
£3.99 £2.99
approx 50 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 1 (1)
Cosmos bipinnatus Apricota

25% off

Cosmos bipinnatus 'Apricota'
From £2.62
approx 50 seeds
0 star 0.25 star 1 star 1 star 1 star 3.3 5 3 (3)
Cosmos bipinnatus Double Click Snow Puff (Double Click Series)

25% off

Cosmos bipinnatus 'Double Click Snow Puff' (Double Click Series)
£3.49 £2.62
approx 60 seeds
Cosmos bipinnatus Purity

25% off

Cosmos bipinnatus 'Purity'
From £2.24
approx 100 seeds
0.5 star 1 star 1 star 1 star 1 star 4.5 5 19 (19)
Papaver rhoeas Amazing Grey

25% off

Papaver rhoeas 'Amazing Grey'
From £2.17
approx 250 seeds
0.5 star 1 star 1 star 1 star 1 star 4.5 5 2 (2)
Verbena rigida Santos

25% off

Verbena rigida 'Santos'
From £2.24
approx 40 seeds
9cm pot
3 × 9cm pots
0 star 0 star 1 star 1 star 1 star 3.0 5 2 (2)
Cosmos bipinnatus Dazzler

25% off

Cosmos bipinnatus 'Dazzler'
£2.25 £1.69
approx 100 seeds
0.25 star 1 star 1 star 1 star 1 star 4.3 5 3 (3)
Cosmos bipinnatus Fizzy Rose Picotee (Fizzy Series)

25% off

Cosmos bipinnatus 'Fizzy Rose Picotee' (Fizzy Series)
From £2.47
approx 100 seeds
9cm pot
2 + 1 FREE 9cm pots
0 star 1 star 1 star 1 star 1 star 4.0 5 1 (1)
Cosmos bipinnatus Rubenza

25% off

Cosmos bipinnatus 'Rubenza'
£2.49 £1.87
approx 30 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 3 (3)
Cosmos bipinnatus Xanthos

25% off

Cosmos bipinnatus 'Xanthos'
From £3.22
approx 30 seeds
0 star 0.25 star 1 star 1 star 1 star 3.3 5 3 (3)
Craspedia globosa

New

25% off

Craspedia globosa
£2.99 £2.24
approx 200 seeds
Matthiola incana Appleblossom

25% off

Matthiola incana 'Appleblossom'
£4.49 £3.37
approx 100 seeds
Matthiola incana Avalanche

25% off

Matthiola incana 'Avalanche'
£4.49 £3.37
approx 100 seeds
Matthiola incana Column Apricot

25% off

Matthiola incana 'Column Apricot'
£4.49 £3.37
approx 100 seeds
Papaver somniferum Maanzaad

25% off

Papaver somniferum 'Maanzaad'
£2.99 £2.24
approx 300 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 Red
Antirrhinum majus 'Madame Butterfly Red'
£3.49
approx 25 seeds
Bupleurum rotundifolium Griffithii

25% off

Bupleurum rotundifolium 'Griffithii'
£2.99 £2.24
approx 125 seeds
Cosmos bipinnatus Candy Stripe

25% off

Cosmos bipinnatus 'Candy Stripe'
£2.99 £2.24
approx 100 seeds
1 star 1 star 1 star 1 star 1 star (1)
Cosmos bipinnatus Double Click Rose Bonbon (Double Click Series)

25% off

Cosmos bipinnatus 'Double Click Rose Bonbon' (Double Click Series)
£4.99 £3.74
approx 75 seeds
1 star 1 star 1 star 1 star 1 star (1)
Cosmos bipinnatus Hummingbird Lilac

25% off

Cosmos bipinnatus 'Hummingbird Lilac'
£3.49 £2.62
approx 40 seeds
Cosmos bipinnatus Sensation Picotee (Sensation Series)

25% off

Cosmos bipinnatus 'Sensation Picotee' (Sensation Series)
£4.99 £3.74
approx 75 seeds
0.75 star 1 star 1 star 1 star 1 star (3)
Cosmos bipinnatus Sensation Pinkie (Sensation Series)

25% off

Cosmos bipinnatus 'Sensation Pinkie' (Sensation Series)
£2.99 £2.24
approx 100 seeds
Erysimum cheiri Fire King

25% off

Erysimum cheiri 'Fire King'
From £2.24
approx 500 seeds
0.5 star 1 star 1 star 1 star 1 star (17)
Geranium palmatum

New

25% off

Geranium palmatum
From £2.24
approx 60 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
Oenothera lindheimeri The Bride

25% off

Oenothera lindheimeri 'The Bride'
£2.79 £2.09
approx 25 seeds
Oenothera versicolor Sunset Boulevard

New

25% off

Oenothera versicolor 'Sunset Boulevard'
£2.99 £2.24
approx 100 seeds
Antirrhinum majus Admiral Crimson

25% off

Antirrhinum majus 'Admiral Crimson'
£4.49 £3.37
approx 50 seeds
Cosmos bipinnatus Casanova Pink (Casanova Series)

25% off

Cosmos bipinnatus 'Casanova Pink' (Casanova Series)
£3.29 £2.47
approx 30 seeds
1 star 1 star 1 star 1 star 1 star (1)
Cosmos bipinnatus Double Click Cranberries (Double Click Series)

25% off

Cosmos bipinnatus 'Double Click Cranberries' (Double Click Series)
£5.99 £4.49
approx 60 seeds
Cosmos bipinnatus Velouette
Cosmos bipinnatus 'Velouette'
£3.99
approx 30 seeds
Dahlia Black Forest Ruby

New

Dahlia 'Black Forest Ruby'
£2.99
approx 50 seeds
Matthiola incana Anytime Red (Anytime Series)

25% off

Matthiola incana 'Anytime Red' (Anytime Series)
£3.49 £2.62
approx 100 seeds
Matthiola incana Rainbow Mixture
Matthiola incana 'Rainbow Mixture'
£4.49
approx 100 seeds
Verbena bonariensis Vanity
Verbena bonariensis 'Vanity'
£3.99
approx 40 seeds
Heritage sweet pea seed gift box

25% off

Heritage sweet pea seed gift box
£22.99 £17.24
gift set
Cosmos sulphureus Bright Lights mixed
Cosmos sulphureus 'Bright Lights mixed'
£2.99 £2.24
available to order from autumn
Dark and rich sweet pea collection
Dark & rich sweet pea collection
£9.37 £7.03
available to order from autumn
Lavish and lush sweet pea collection
Lavish & lush sweet pea collection
£9.37 £7.03
available to order from autumn
Antirrhinum majus Madame Butterfly Pink
Antirrhinum majus 'Madame Butterfly Pink'
£4.49 £3.37
available to order from autumn
Cosmos bipinnatus Apricot Lemonade

New

Cosmos bipinnatus 'Apricot Lemonade'
From £2.24
available to order from autumn
Cosmos bipinnatus Seashells mixed

New

Cosmos bipinnatus 'Seashells mixed'
£2.99 £2.24
available to order from autumn
Matthiola longipetala subsp. bicornis

New

Matthiola longipetala subsp. bicornis
£2.99 £2.24
available to order from autumn
Cosmos bipinnatus Cupcakes Blush (Cupcakes Series)

New

Cosmos bipinnatus 'Cupcakes Blush' (Cupcakes Series)
£3.49 £2.62
available to order from autumn
Geranium Maderense

New

Geranium Maderense
From £2.62
available to order from autumn

Our semi hardy flower seeds 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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