What to sow and plant in summer — UK
Summer is less about starting things and more about keeping them going. Water, feed, stake and keep picking. It is also when the overwintering sowings begin, which is what carries the garden through to next spring.
Sow in summer
Radish
Raphanus sativus
Lettuce
Lactuca sativa
Carrot
Daucus carota
Spinach
Spinacia oleracea
Swiss Chard
Beta vulgaris
Foxglove
Digitalis purpurea
Forget-me-not
Myosotis
Sweet William
Dianthus barbatus
Swede
Brassica napus
Kohlrabi
Brassica oleracea (Gongylodes)
Florence Fennel
Foeniculum vulgare azoricum
Pak Choi
Brassica rapa chinensis
Mustard Greens
Brassica juncea
Endive
Cichorium endivia
Plant in summer
Cucumber
Cucumis sativus
Courgette
Cucurbita pepo
Runner Bean
Phaseolus coccineus
Dwarf French Bean
Phaseolus vulgaris
Kale
Brassica oleracea
Broccoli
Brassica oleracea
Brussels Sprout
Brassica oleracea
Sweetcorn
Zea mays
Pumpkin
Cucurbita maxima
Butternut Squash
Cucurbita moschata
Leek
Allium ampeloprasum
Basil
Ocimum basilicum
Zinnia
Zinnia elegans
Annual Salvia
Salvia splendens
Tuberous Begonia
Begonia x tuberhybrida
Bearded Iris
Iris germanica
Bedding Begonia
Begonia semperflorens
Geranium
Pelargonium
Bacopa
Sutera cordata
Diascia
Diascia
Nemesia
Nemesia
African Daisy
Osteospermum
Gazania
Gazania rigens
Heliotrope
Heliotropium arborescens
Bedding Verbena
Verbena x hybrida
Poor Man's Orchid
Schizanthus pinnatus
Salvia 'Hot Lips'
Salvia microphylla 'Hot Lips'
Celery
Apium graveolens
Celeriac
Apium graveolens rapaceum
Sweet Marjoram
Origanum majorana
Lemon Verbena
Aloysia citrodora
Purple Sprouting Broccoli
Brassica oleracea italica
Perilla / Shiso
Perilla frutescens
Harvest in summer
Radish
Raphanus sativus
Lettuce
Lactuca sativa
Cherry Tomato
Solanum lycopersicum
Beef Tomato
Solanum lycopersicum
Cucumber
Cucumis sativus
Courgette
Cucurbita pepo
Runner Bean
Phaseolus coccineus
Dwarf French Bean
Phaseolus vulgaris
Garden Pea
Pisum sativum
Carrot
Daucus carota
Beetroot
Beta vulgaris
Onion
Allium cepa
Garlic
Allium sativum
Potato
Solanum tuberosum
Swiss Chard
Beta vulgaris
Kale
Brassica oleracea
Cabbage
Brassica oleracea
Broccoli
Brassica oleracea
Cauliflower
Brassica oleracea
Sweet Pepper
Capsicum annuum
Chilli
Capsicum annuum
Aubergine
Solanum melongena
Sweetcorn
Zea mays
Asparagus
Asparagus officinalis
Rhubarb
Rheum rhabarbarum
Spring Onion
Allium fistulosum
Flat-leaf Parsley
Petroselinum crispum
Chives
Allium schoenoprasum
Thyme
Thymus vulgaris
Rosemary
Salvia rosmarinus
Sage
Salvia officinalis
Coriander
Coriandrum sativum
Dill
Anethum graveolens
Oregano
Origanum vulgare
Bay
Laurus nobilis
Lemon Balm
Melissa officinalis
French Tarragon
Artemisia dracunculus
Fennel
Foeniculum vulgare
Lavender
Lavandula angustifolia
Strawberry
Fragaria x ananassa
Raspberry
Rubus idaeus
Blackberry
Rubus fruticosus
Blueberry
Vaccinium corymbosum
Gooseberry
Ribes uva-crispa
Blackcurrant
Ribes nigrum
Redcurrant
Ribes rubrum
Apple
Malus domestica
Plum
Prunus domestica
Cherry
Prunus avium
Peach
Prunus persica
Fig
Ficus carica
Grape Vine
Vitis vinifera
Turnip
Brassica rapa
Kohlrabi
Brassica oleracea (Gongylodes)
Celery
Apium graveolens
Pak Choi
Brassica rapa chinensis
Broad Bean
Vicia faba
Sugar Snap Pea
Pisum sativum
Mangetout
Pisum sativum macrocarpon
Shallot
Allium cepa aggregatum
Globe Artichoke
Cynara scolymus
Sweet Marjoram
Origanum majorana
Borage
Borago officinalis
Lemon Verbena
Aloysia citrodora
Anise Hyssop
Agastache foeniculum
Mulberry
Morus nigra
Tayberry
Rubus 'Tayberry'
Marsh Samphire
Salicornia europaea
Asparagus Pea
Lotus tetragonolobus
Summer Savory
Satureja hortensis
Chervil
Anthriscus cerefolium
Comfrey
Symphytum officinale
Vietnamese Coriander
Persicaria odorata
Perilla / Shiso
Perilla frutescens
Jostaberry
Ribes x nidigrolaria
Whitecurrant
Ribes rubrum
Japanese Wineberry
Rubus phoenicolasius
Black Elder
Sambucus nigra
White Mulberry
Morus alba
Worth knowing: Water deeply two or three times a week rather than lightly every day. Shallow watering keeps roots near the surface where they dry out fastest.