Sow in an open, sunny site on moist, free draining soil that is very fertile and which, ideally, has benefitted from manure or garden compost as well as fertiliser containing trace elements, such as Vitax Q4.
Swedes need a firm seed bed. Sow from early May in the north to mid June in the south. Sow 2cm (¾in) deep in rows 38cm (15in) apart, and thin to 23cm (9in) apart.
They can be sown as plugs, in plant modules filled with multipurpose compost. Plant plugs out when the roots fill the cells.
They are a long term crop, taking up to six months to mature. Keep the soil moist and weed free thoroughout.
Thin out the seedlings when large enough to handle, leaving plants 23cm (9in) apart.
Water during dry periods but try to keep the soil evenly moist to prevent cracking and corky growth. Dryness at the roots can also lead to a bitter taste.
Powdery Mildew: Appears as a white powdery deposit over the leaf surface and leaves become stunted and shrivel.
Remedy: Keep the soil moist and grow in cooler locations.
More info on Powdery Mildew
Club root: Roots become swollen and distorted, and leaves become pale and yellow and wilt easily. Plants may die.
Remedy: Improve drainage and add lime to make soil more alkaline. Do not grow in affected soil.
More info on Club root
Cabbage root fly: White larvae approximately 5cm (2in) long, feed on the roots just below the soil surface, stunting growth and causing plants to wilt and die.
Remedy: Grow under insect-proof mesh or horticultural fleece. Seedlings are most vulnerable.
More info on Cabbage root fly
Lift roots from September to November once large enough to use, or leave in the ground until Christmas. Cover with straw or bracken before the onset of cold weather. In cold regions store in containers of soil or potting medium in sheds or garages.
Wilhelmsburger:This boasts a creamy, golden flesh covered with a green skin. It keeps well and is resistant to clubroot.
‘Angela’:This is well flavoured and resistant to powdery mildew.
‘Marian’:Purple with yellow flesh and a nutty flavour. Powdery mildew and clubroot resistant.
‘Magres’ AGM:Has full-flavoured yellow flesh and is mildew resistant.