What to sow in Cardiff in May
In May, Cardiff averages 13 °C, with nights around 9 °C.
Frosty nights are usual from December to February: the last frost typically comes in February.
A typical winter's coldest night: −2 °C.
Warm months (15 °C or more on average): June to September.
Sow outdoors
- Onion (Allium cepa)
- Beet (Beta vulgaris)
- Endive (Cichorium endivia)
- Fennel (Foeniculum vulgare)
- Lettuce (Lactuca sativa)
- Welsh onion (Allium fistulosum)
- Cabbage (Brassica oleracea)
- Chives (Allium schoenoprasum)
- French bean (Phaseolus vulgaris)
- Pea (Pisum sativum)
- Spinach (Spinacia oleracea)
- Rape (Brassica napus)
- Salsify (Tragopogon porrifolius)
- Quinoa (Chenopodium quinoa)
- Cape Gooseberry (Physalis peruviana)
- Brown mustard (Brassica juncea)
- Chinese chives (Allium tuberosum)
- Coriander (Coriandrum sativum)
- Dill (Anethum graveolens)
- Oregano (Origanum vulgare)
- Arrach (Atriplex hortensis)
- Borage (Borago officinalis)
- Pot marigold (Calendula officinalis)
- Garden cress (Lepidium sativum)
Sow indoors
In pots or trays somewhere warm, to plant out later.
- Celery (Apium graveolens)
- Pepper (Capsicum annuum)
- Radish (Raphanus sativus)
- Parsley (Petroselinum crispum)
- Cucumber (Cucumis sativus)
- Courgette (Cucurbita pepo)
- Carrot (Daucus carota)
- Parsnip (Pastinaca sativa)
- Sweet basil (Ocimum basilicum)
- Sunflower (Helianthus annuus)
- Sweet wormwood (Artemisia annua)
- Common Poppy (Papaver rhoeas)
- Snapdragon (Antirrhinum majus)
- Aztec tobacco (Nicotiana rustica)
- Rocket (Eruca sativa)
- Marshmallow (Althaea officinalis)
- Garden leek (Allium porrum)
- Sieva bean (Phaseolus lunatus)
- Rakkyo (Allium chinense)
- Cape aloe (Aloe ferox)
- Browntop millet (Brachiaria ramosa)
- Cumin (Cuminum cyminum)
- Niger (Guizotia abyssinica)
- Creta trefoil (Lotus creticus)
New next month, in June
- Broad Bean (Vicia faba)
- Corn (Zea mays)
- Leek (Allium ampeloprasum)
- Purslane (Portulaca oleracea)
- Rice bean (Vigna umbellata)
- Brook alder (Alnus maritima)
- Two-horn bundleflower (Desmanthus bicornutus)
- American black nightshade (Solanum americanum)
- Velvetleaf (Abutilon theophrasti)
- Brown Indianhemp (Hibiscus cannabinus)
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Month by month
Worked out from the last ten years of Cardiff's climate and each plant's needs: germination temperature, frost limit and time to harvest.