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Flower seeds to sow indoors in May

Shop flower seeds to sow indoors in May with confidence

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Used at RHS Chelsea Flower Show
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Showing Seeds Flower seed Sowing month inside or protected : May clear all
57 items
Pastels cutting garden collection

25% off

Pastels cutting garden collection
£28.62 £21.46
1 × collection
Salvia viridis Blue Monday

25% off

Salvia viridis 'Blue Monday'
£2.19 £1.64
approx 180 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 1 (1)
Aubrieta Purple Cascade (Cascade Series) F1

25% off

Aubrieta 'Purple Cascade' (Cascade Series) F1
£3.49 £2.62
approx 400 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 4 (4)
Moluccella laevis

25% off

Moluccella laevis
£2.25 £1.69
approx 200 seeds
Papaver dubium subsp. lecoqii Albiflorum

Best Seller

25% off

Papaver dubium subsp. lecoqii 'Albiflorum'
From £2.24
approx 50 seeds
0 star 0 star 1 star 1 star 1 star 3.0 5 1 (1)
Visnaga daucoides Green Mist

25% off

Visnaga daucoides 'Green Mist'
£3.29 £2.47
approx 200 seeds
1 star 1 star 1 star 1 star 1 star 5.0 5 2 (2)
Visnaga daucoides

25% off

Visnaga daucoides (syn. Ammi visnaga)
From £1.87
approx 300 seeds
Papaver somniferum Maanzaad

25% off

Papaver somniferum 'Maanzaad'
£2.99 £2.24
approx 300 seeds
Lagurus ovatus

25% off

Lagurus ovatus
£2.69 £2.02
approx 500 seeds
Digitalis purpurea

Up to 30% off

Digitalis purpurea
From £2.09
approx 1000 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
0.75 star 1 star 1 star 1 star 1 star 4.9 5 7 (7)
Centaurea cyanus Classic Fantastic
Centaurea cyanus 'Classic Fantastic'
£2.99 £2.24
available to order from autumn
Centaurea cyanus Blue Ball

25% off

Centaurea cyanus 'Blue Ball'
£2.99 £2.24
approx 325 seeds
Cosmos bipinnatus Hummingbird Lilac

25% off

Cosmos bipinnatus 'Hummingbird Lilac'
£3.49 £2.62
approx 40 seeds
Cobaea scandens
Cobaea scandens
£3.19 £2.39
available to order from autumn
0 star 0 star 1 star 1 star 1 star 3.0 5 1 (1)
Dahlia Black Forest Ruby

New

Dahlia 'Black Forest Ruby'
£2.99
approx 50 seeds
Delphinium Pacific Hybrids

25% off

Delphinium Pacific hybrids
£3.49 £2.62
approx 70 seeds
Delphinium requienii

New

Delphinium requienii
£4.99 £3.74
available to order from autumn
Phacelia tanacetifolia

25% off

Phacelia tanacetifolia - green manure
£2.89 £2.17
25m² pack
1 star 1 star 1 star 1 star 1 star 5.0 5 3 (3)
Digitalis purpurea Sutton's Apricot

Best Seller

25% off

Digitalis purpurea 'Sutton's Apricot'
From £2.02
approx 150 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
0 star 0.5 star 1 star 1 star 1 star 3.4 5 8 (8)
Digitalis purpurea Pam's Choice

25% off

Digitalis purpurea 'Pam's Choice'
£3.49 £2.62
approx 200 seeds
Digitalis purpurea Excelsior Group

25% off

Digitalis purpurea Excelsior Group
From £2.62
approx 1000 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
0 star 1 star 1 star 1 star 1 star (9)
Aquilegia vulgaris Pink Petticoat

New

Aquilegia vulgaris 'Pink Petticoat'
£3.99 £2.99
available to order from autumn
Lunaria annua Chedglow
Lunaria annua 'Chedglow'
From £3.74
available to order from summer
0.75 star 1 star 1 star 1 star 1 star (3)
Cerinthe major Purpurascens

25% off

Cerinthe major 'Purpurascens'
From £2.62
approx 12 seeds
0.75 star 1 star 1 star 1 star 1 star (13)
Oreomecon nudicaulis

25% off

Icelandic poppy mixed | Papaver nudicaulis
£3.49 £2.62
approx 300 seeds
Persicaria orientalis Cerise Pearls

25% off

Persicaria orientalis 'Cerise Pearls'
£3.99 £2.99
approx 100 seeds
Ipomoea tricolor Heavenly Blue

25% off

Ipomoea tricolor 'Heavenly Blue'
£2.99 £2.24
approx 85 seeds
1 star 1 star 1 star 1 star 1 star (1)
Ipomoea purpurea Grandpa Otts

25% off

Ipomoea purpurea 'Grandpa Otts'
£2.25 £1.69
approx 30 seeds
0 star 1 star 1 star 1 star 1 star (1)
Aquilegia vulgaris William Guiness

25% off

Aquilegia vulgaris 'William Guiness'
£3.99 £2.99
approx 40 seeds
Viola × wittrockiana Frizzle Sizzle Burgundy F1 (Frizzle Sizzle Series)

25% off

pansy 'Frizzle Sizzle Burgundy' (Frizzle Sizzle Series) F1
From £3.74
approx 25 seeds
Viola × wittrockiana Frizzle Sizzle Blue F1 (Frizzle Sizzle Series)
pansy 'Frizzle Sizzle Blue' (Frizzle Sizzle Series) F1
From £2.62
available to order from autumn
Lepidium sativum

25% off

Lepidium sativum
£2.99 £2.24
approx 4500 seeds
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 (2)
Tagetes tenuifolia Golden Gem

25% off

Tagetes tenuifolia 'Golden Gem'
£2.99 £2.24
approx 225 seeds
Scabiosa stellata

25% off

Scabiosa stellata
£2.99 £2.24
approx 65 seeds
Digitalis × mertonensis

25% off

Digitalis × mertonensis
From £3.37
approx 1000 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
0.25 star 1 star 1 star 1 star 1 star (4)
Helianthus debilis Soluna Lemon

25% off

Helianthus debilis 'Soluna Lemon'
£3.49 £2.62
approx 30 seeds
Helianthus annuus Desire Red
Helianthus annuus 'Desire Red'
£3.99
approx 10 seeds
Helianthus debilis Soluna Bronze

25% off

Helianthus debilis 'Soluna Bronze'
£3.49 £2.62
approx 30 seeds
Tagetes patula Burning Embers

25% off

Tagetes patula 'Burning Embers'
£2.39 £1.79
approx 50 seeds
Viola odorata

25% off

Viola odorata
From £2.47
approx 50 seeds
9cm pot
3 × 9cm pots
6 × 9cm pots
1 star 1 star 1 star 1 star 1 star (2)
Nicotiana sylvestris

25% off

Nicotiana sylvestris
£2.79 £2.09
approx 450 seeds
0.5 star 1 star 1 star 1 star 1 star (5)
Nicotiana mutabilis

25% off

Nicotiana mutabilis
£2.79 £2.09
approx 100 seeds
1 star 1 star 1 star 1 star 1 star (3)
Nicotiana Lime Green

25% off

Nicotiana 'Lime Green'
£2.25 £1.69
approx 1600 seeds
Nicotiana alata Grandiflora

25% off

Nicotiana alata 'Grandiflora'
£2.99 £2.24
approx 700 seeds
0.75 star 1 star 1 star 1 star 1 star (3)
Nicotiana Whisper Mixed F1

25% off

Nicotiana 'Whisper Mixed' F1
From £2.24
approx 70 seeds
0.75 star 1 star 1 star 1 star 1 star (13)
Nicotiana × sanderae Perfume Deep Purple (Perfume Series)

New

Nicotiana × sanderae 'Perfume Deep Purple' (Perfume Series)
£2.99 £2.24
available to order from autumn
Viola Vivaldi Beacon

New

Viola 'Vivaldi Beacon'
£4.99
approx 20 seeds
Centaurea cyanus White Ball

25% off

Centaurea cyanus 'White Ball'
£2.49 £1.87
approx 300 seeds
Orlaya grandiflora

Best Seller

25% off

Orlaya grandiflora
From £2.17
approx 25 seeds
0.25 star 1 star 1 star 1 star 1 star (10)
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Our flower seeds to sow indoors in May 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.