What to sow in Cardiff in September
In September, Cardiff averages 15 °C, with nights around 12 °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)
- Fennel (Foeniculum vulgare)
- Lettuce (Lactuca sativa)
- Chives (Allium schoenoprasum)
- French bean (Phaseolus vulgaris)
- Spinach (Spinacia oleracea)
- Rape (Brassica napus)
- Quinoa (Chenopodium quinoa)
- Brown mustard (Brassica juncea)
- Chinese chives (Allium tuberosum)
- Coriander (Coriandrum sativum)
- Dill (Anethum graveolens)
- Arrach (Atriplex hortensis)
- Borage (Borago officinalis)
- Pot marigold (Calendula officinalis)
- Garden cress (Lepidium sativum)
- Opium Poppy (Papaver somniferum)
- Eastern purple coneflower (Echinacea purpurea)
- Mountain arnica (Arnica montana)
- Nasturtium (Tropaeolum majus)
- Hemp (Cannabis sativa)
- Turnip-root chervil (Chaerophyllum bulbosum)
- Crown daisy (Glebionis coronaria)
Sow indoors
In pots or trays somewhere warm, to plant out later.
New next month, in October
- Angelica archangelica
- Koeleria cristata
- Saffron (Crocus sativus)
- Lovage (Levisticum officinale)
- Pacific Silver Fir (Abies amabilis)
Set Cardiff as your place in the app to see what to sow in your own garden, with your sowings and the weather. Set my place
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.