What to Plant in September
Seeds to sow, young plants to put out, and what's flowering in September in UK gardens — drawn straight from the GardenWizz plant encyclopedia.
🌱 Sow in September
Sow these seeds this month (23 plants).
Apple (Malus domestica)
Bearberry (Arctostaphylos uva-ursi)
Blueberry (Vaccinium corymbosum)
Bracken (Pteridium aquilinum)
Chamomile (Matricaria chamomilla)
Cornflower (Centaurea cyanus)
Daffodil (Narcissus)
Fern (Dryopteris filix-mas)
Field Maple (Acer campestre)
Guelder Rose (Viburnum opulus)
Holly (Ilex aquifolium)
Japanese Maple (Acer palmatum)
Lupin (Lupinus)
Onion (Allium cepa)
Poppy (Papaver)
Potato (Solanum tuberosum)
Pot Marigold (Calendula officinalis)
Raspberry (Rubus idaeus)
Red Campion (Silene dioica)
Snapdragon (Antirrhinum majus)
Strawberry (Fragaria ananassa)
Sweet Pea (Lathyrus odoratus)
Tulip (Tulipa)
🪴 Plant out in September
Put these into the garden now (47 plants).
Avens (Geum)
Bay (Laurus nobilis)
Bearded Iris (Iris germanica)
Blackberry (Rubus fruticosus)
Bluebell (Hyacinthoides non-scripta)
Blueberry 'Duke'
Blueberry 'Spartan'
Boxwood (Buxus sempervirens)
Bugle (Ajuga reptans)
Camellia (Camellia japonica)
Catmint (Nepeta)
Chamomile (Matricaria chamomilla)
Clematis (Clematis)
Common Lilac (Syringa vulgaris)
Common Rose (Rosa gallica)
Coral Bells (Heuchera)
Daffodil (Narcissus)
Daylily (Hemerocallis)
Dogwood (Cornus sanguinea)
Elder (Sambucus nigra)
English Ivy (Hedera helix)
Fern (Dryopteris filix-mas)
Foxglove (Digitalis purpurea)
Gorse (Ulex europaeus)
Heather (Calluna vulgaris)
Hellebore (Helleborus)
Honeysuckle 'Serotina'
Hornbeam (Carpinus betulus)
Hosta
Lavender (Lavandula angustifolia)
Lemon Balm (Melissa officinalis)
Lily of the Valley (Convallaria majalis)
Mint (Mentha)
Onion (Allium cepa)
Red Campion (Silene dioica)
Rhododendron
Rosebay Willowherb (Epilobium angustifolium)
Rosemary (Salvia rosmarinus)
Snowdrop (Galanthus nivalis)
Strawberry 'Cambridge Favourite'
Strawberry 'Hapil'
Strawberry 'Honeoye'
Tulip (Tulipa)
Wild Strawberry (Fragaria vesca)
Wisteria 'Amethyst'
Wisteria 'Prolific'
Wisteria (Wisteria sinensis)
🌸 In flower in September
What's blooming this month (31 plants).
Autumn Crocus (Colchicum autumnale)
Catmint (Nepeta)
Chamomile (Matricaria chamomilla)
Clematis (Clematis)
Coneflower (Echinacea purpurea)
Coral Bells (Heuchera)
Cornflower (Centaurea cyanus)
Cosmos (Cosmos bipinnatus)
Dahlia (Dahlia pinnata)
English Ivy (Hedera helix)
Foxglove (Digitalis purpurea)
Fuchsia
Heather (Calluna vulgaris)
Honeysuckle 'Graham Thomas'
Honeysuckle (Lonicera periclymenum)
Honeysuckle 'Serotina'
Hydrangea (Hydrangea macrophylla)
Marigold (Tagetes)
Onion (Allium cepa)
Parsley (Petroselinum crispum)
Pot Marigold (Calendula officinalis)
Red Campion (Silene dioica)
Rosebay Willowherb (Epilobium angustifolium)
Rose (Rosa)
Rudbeckia (Rudbeckia fulgida)
Runner Bean (Phaseolus coccineus)
Snapdragon (Antirrhinum majus)
Stonecrop (Sedum)
Strawberry Tree (Arbutus unedo)
Wild Strawberry (Fragaria vesca)
Yarrow (Achillea millefolium)
❄️ UK frost dates by region
Approximate last spring / first autumn frost — always check your local forecast before sowing or planting out tender plants.
| Region | Last spring frost | First autumn frost |
|---|---|---|
| Scotland & far north | late May | late September |
| North of England | mid May | mid October |
| Midlands & Wales | early–mid May | late October |
| East & South East England | late April–early May | late October |
| London & urban areas | mid April | early November |
| South West & coastal | mid April | November |