What to Plant in August
Seeds to sow, young plants to put out, and what's flowering in August in UK gardens — drawn straight from the GardenWizz plant encyclopedia.
🌱 Sow in August
Sow these seeds this month (18 plants).
Allium (Allium hollandicum)
Autumn Sage (Salvia greggii)
Beet (Beta vulgaris)
Blue Garlic (Allium caesium)
Bulb Onion (Allium cepa)
Chives (Allium schoenoprasum)
Coriander (Coriandrum sativum)
Cornflower (Centaurea cyanus)
Cowslip (Primula veris)
Dill (Anethum graveolens)
Fern (Dryopteris filix-mas)
Mexican Pincushion Cactus (Mammillaria magnimamma)
Pink Lily Leek (Allium oreophilum)
Potato (Solanum tuberosum)
Radish (Raphanus sativus)
Small Yellow Onion (Allium flavum)
Snapdragon (Antirrhinum majus)
Star Of Persia (Allium cristophii)
🪴 Plant out in August
Put these into the garden now (51 plants).
Aloe
Apothecary's Rose (Rosa gallica)
Autumn Crocus (Colchicum autumnale)
Baum's Pincushion Cactus (Mammillaria baumii)
Bay Tree (Laurus nobilis)
Bearded Iris (Iris germanica)
Birch-Leaved Bellflower (Campanula betulifolia)
Blackberry (Rubus fruticosus)
Blood Iris (Iris sanguinea)
Boxwood (Buxus sempervirens)
Bristle-Pointed Iris (Iris setosa)
Bukhara Iris (Iris bucharica)
Calathea (Calathea makoyana)
Catmint (Nepeta)
Chenille Plant (Acalypha hispida)
Common Daisy (Bellis perennis)
Common Dog-Violet (Viola riviniana)
Coneflower (Echinacea purpurea)
Coral Bells (Heuchera)
Courgette (Cucurbita pepo)
Cowslip (Primula veris)
Dogwood (Cornus sanguinea)
English Ivy (Hedera helix)
Fall Crocus (Crocus goulimyi)
Fern (Dryopteris filix-mas)
Florentine Iris (Iris florentina)
Garden Parsley (Petroselinum crispum)
Gorse (Ulex europaeus)
Great Basil (Ocimum basilicum)
Hairyflower Bellflower (Campanula chamissonis)
Hellebore (Helleborus)
Irises (Iris)
Kerner Iris (Iris kerneriana)
Kotschy's Crocus (Crocus kotschyanus)
Lemon Balm (Melissa officinalis)
Long-Scape Iris (Iris delavayi)
Moth Orchid 'Ariadne' (Phalaenopsis × ariadne)
Nordmann Fir (Abies nordmanniana)
Paperbark Maple (Acer griseum)
Red-Barked Dogwood (Cornus alba)
Red Campion (Silene dioica)
Rosemary (Salvia rosmarinus)
Sage (Salvia officinalis)
Shrubby Rock-Roses (Cistus)
Smooth Crocus (Crocus laevigatus)
Stonecrop (Sedum)
Tarragon (Artemisia dracunculus)
Traveller's Joy (Clematis vitalba)
Water Iris (Iris laevigata)
Yunnan Iris (Iris forrestii)
ZZ Plant (Zamioculcas zamiifolia)
🌸 In flower in August
What's blooming this month (188 plants).
Acanthocalycium spiniflorum
African Milk Barrel (Euphorbia horrida)
Aloe
Alpine Primrose (Primula alpicola)
American Century Plant (Agave americana)
Angular Jasmine (Jasminum angulare)
Anise-Scented Sage (Salvia guaranitica)
Apothecary's Rose (Rosa gallica)
Ashy Crane's-Bill (Geranium cinereum)
Autumn Sage (Salvia greggii)
Avens (Geum)
Barbados Aloe (Aloe vera)
Basil-Leaved Rockrose (Cistus candidus)
Baum's Pincushion Cactus (Mammillaria baumii)
Beardtongue (Penstemon)
Bear's Breech (Acanthus mollis)
Bedding Pelargonium (Pelargonium × hortorum)
Bees' Primrose (Primula beesiana)
Begonias (Begonia)
Bellflowers (Campanula)
Bell Heather (Erica cinerea)
Bigleaf Hydrangea (Hydrangea macrophylla)
Bigleaf Hydrangea (Hydrangea macrophylla)
Blue Allium (Allium cyaneum)
Blue Garlic (Allium caesium)
Borage (Borago officinalis)
Brilliant Fuchsia (Fuchsia fulgens)
Bulley's Primrose (Primula bulleyana)
Butterfly-Bush (Buddleja davidii)
Buttonhead Primrose (Primula capitata)
Calathea (Calathea makoyana)
Candelabra Sage (Salvia candelabrum)
Cardinal Sage (Salvia fulgens)
Carrot (Daucus carota subsp. sativus)
Catalonian Jasmine (Jasminum grandiflorum)
Catmint (Nepeta)
Chamomile (Matricaria chamomilla)
Chenille Plant (Acalypha hispida)
Chenille Plant (Echeveria leucotricha)
Chicory (Cichorium intybus)
Chrysanthemum (Chrysanthemum morifolium)
Clustered Bellflower (Campanula glomerata)
Common Bird's-Foot-Trefoil (Lotus corniculatus)
Common Daisy (Bellis perennis)
Common Mint (Mentha spicata)
Common Teasel (Dipsacus fullonum)
Common Thyme (Thymus vulgaris)
Coneflower (Echinacea purpurea)
Coral Bells (Heuchera)
Cornflower (Centaurea cyanus)
Corrugated Sage (Salvia corrugata)
Courgette (Cucurbita pepo)
Crocosmia (Crocosmia crocosmiiflora)
Daylily (Hemerocallis)
Digenous Sage (Salvia digenea)
Dill (Anethum graveolens)
Dog Rose (Rosa rugosa)
Druce's Cranesbill (Geranium × oxonianum)
Dwarf Rock Rose (Cistus dansereaui)
Echeveria
English Ivy (Hedera helix)
English Lavender (Lavandula angustifolia)
Etruscan Honeysuckle (Lonicera etrusca)
Fern-Leaved Begonia (Begonia foliosa)
Fire Heath (Erica cerinthoides)
Florence Fennel (Foeniculum vulgare)
Formosan Lady's Slipper Orchid (Cypripedium formosanum)
Forrest's Tutsan (Hypericum forrestii)
Foxglove (Digitalis purpurea)
Fragrant Snowball (Viburnum × carlcephalum)
French Bean (Phaseolus vulgaris)
Fuchsias (Fuchsia)
Garden Cosmos (Cosmos bipinnatus)
Garden Dahlia (Dahlia pinnata)
Garden Parsley (Petroselinum crispum)
Garden Phlox (Phlox arendsii)
Giant Herb Robert (Geranium maderense)
Gold Lace Cactus (Mammillaria elongata)
Great Basil (Ocimum basilicum)
Hairyflower Bellflower (Campanula chamissonis)
Hardy Begonia (Begonia grandis)
Hardy Geranium (Geranium)
Heather (Calluna vulgaris)
Hebe (Hebe pinguifolia)
Hollyhock (Alcea rosea)
Honeysuckle (Lonicera periclymenum)
Hornbeam (Carpinus betulus)
Horned Spurge (Euphorbia ceratocarpa)
Horned Spurge (Euphorbia cornigera)
Hybrid Honeysuckle (Lonicera × heckrottii)
Hypericum Dummeri (Hypericum × dummeri)
I. Fulvala (Iris fulvala)
Imperial Begonia (Begonia imperialis)
Jame Sage (Salvia × jamensis)
Japanese Spiraea (Spiraea japonica)
Keeled Garlic (Allium carinatum)
Lady's Eardrops (Fuchsia boliviana)
Large Speedwell (Veronica austriaca)
Large-Thorned Agave (Agave macroacantha)
Lau's Echeveria (Echeveria laui)
Leek (Allium porrum)
Lemon Balm (Melissa officinalis)
Leopold Agave (Agave leopoldii)
Lettuce (Lactuca sativa)
Lindavicum Cranesbill (Geranium × lindavicum)
Lipstick (Echeveria agavoides)
Long-Scape Iris (Iris delavayi)
Lupin (Lupinus)
Magnolia (Magnolia grandiflora)
Maple Leaf Begonia (Begonia dregei)
Margalida Spurge (Euphorbia margalidiana)
Marigolds (Tagetes)
Martin's Spurge (Euphorbia martini)
Mexican-Giant (Echeveria colorata)
Mint (Mentha)
Moth Orchid 'Ariadne' (Phalaenopsis × ariadne)
Moth Orchid (Phalaenopsis)
Nasturtium (Tropaeolum majus)
New England Aster (Symphyotrichum novae-angliae)
Nodding Onion (Allium cernuum)
Old Lady Cactus (Mammillaria hahniana)
Oregano (Origanum vulgare)
Palm-Leaf Begonia (Begonia carolineifolia)
Panicle Hydrangea (Hydrangea paniculata)
Parry's Agave (Agave parryi)
Peace Lily (Spathiphyllum wallisii)
Pea (Pisum sativum)
Pelargonium (Pelargonium x hortorum)
Petunia (Petunia x hybrida)
Plantain Lily (Hosta)
Poppy (Papaver)
Pot Marigold (Calendula officinalis)
Powderpuff Cactus (Mammillaria bocasana)
Primroses (Primula)
Privet (Ligustrum vulgare)
Pumpkin (Cucurbita maxima)
Purple Cranesbill (Geranium × magnificum)
Radish (Raphanus sativus)
Red Bartsia (Odontites vernus)
Red Campion (Silene dioica)
Red Clover (Trifolium pratense)
Rock Crane's-Bill (Geranium macrorrhizum)
Rock Rose (Cistus × aguilarii)
Rock Rose (Cistus ingwersenii)
Rosebay Willowherb (Epilobium angustifolium)
Roseleaf Sage (Salvia involucrata)
Rosemary (Salvia rosmarinus)
Rudbeckia (Rudbeckia fulgida)
Rue (Ruta graveolens)
Runner Bean (Phaseolus coccineus)
Russian Sage (Perovskia atriplicifolia)
Sabra Spike Sage (Salvia confertiflora)
Sage (Salvia officinalis)
Salvia (Salvia nemorosa)
Sea Milkball (Euphorbia flanaganii)
Silken Pincushion Cactus (Mammillaria bombycina)
Silver Sage (Salvia argentea)
Silver Wattle (Acacia dealbata)
Small-Leaved Lime (Tilia cordata)
Smooth Azalea (Rhododendron arborescens)
Snapdragon (Antirrhinum majus)
Speedwells (Veronica)
Spider Plant (Chlorophytum comosum)
St John's Wort (Hypericum beanii)
St John's Wort (Hypericum perforatum)
St. John's Worts (Hypericum)
Stonecrop (Sedum)
Striped Begonia (Begonia listada)
Sunflower (Helianthus annuus)
Sweet Pea (Lathyrus odoratus)
Tibetan Cowslip (Primula florindae)
Tomato (Solanum lycopersicum)
Traveller's Joy (Clematis vitalba)
Tree Fuchsia (Fuchsia arborescens)
Tropical Sage (Salvia coccinea)
Tussock Bellflower (Campanula carpatica)
Twin-Spined Cactus (Mammillaria geminispina)
Verbena (Verbena bonariensis)
Viburnums (Viburnum)
Wayfaring Tree (Viburnum lantana)
White Clover (Trifolium repens)
White Dead-Nettle (Lamium album)
Wild Carrot (Daucus carota)
Wild Mint (Mentha arvensis)
Wild Parsley (Aethusa cynapium)
Wild Strawberry (Fragaria vesca)
Yarrow (Achillea millefolium)
ZZ Plant (Zamioculcas zamiifolia)
❄️ 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 |
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