Although the minimum soil temperature for germination is 15°C (59°F), endive germinates best at 20-22°C (68-72°F).
Sow early crops under glass in pots and modules, and transplant. Plants tend to bolt if temperatures fall below 5C (41°F) for too long, but bolt-resistant cultivars are often successful for early sowings. Sow thinly from April to August, 1cm (½in) deep in rows 30cm (12in) apart, thinning to 23-38cm (9-13in) apart within the rows.
Sow from mid to late August for winter crops, transplant and grow in glasshouse or use cloches from October- November.
Sow from February to October for ‘cut and come again’ seedlings, if the soil is warm enough, or under glass or horticultural fleece, sowing every three weeks. Sow ‘cut and come again’ crops in broad drills or containers.
Soils should be light, rich and free draining, but any soil can be used as long as it is not waterlogged. Dry soil can cause ‘bolting’ (running to seed), so keep the soil moist.
Higher temperatures encourage bitterness, though curled types are heat tolerant. Water thoroughly before the onset of dry weather, mulch and keep weed free. Liquid feed fortnightly in summer with a general fertiliser.
Blanch endive about 12 weeks after sowing when the heads have matured. Make sure the leaves are dry (damp leaves are likely to rot) and tie them loosely together with raffia or soft string. Alternatively, place a tile, piece of cardboard or a dinner plate over the centre of the plant, or cover with a bucket or a black plastic pot with the drainage holes covered.
Blanching takes about 10-14 days, but in cooler autumn weather may take longer. Blanch a few at a time, as plants rapidly deteriorate afterwards (especially in warm or rainy weather).
‘Cut and come again’ crops can be harvested after about five weeks – one or two cuts are possible before they run to seed.
Slugs and snails
There are many ways to control slugs and snails, including beer traps, sawdust or eggshell barriers, copper tape and biocontrols.
More info on Slugs and snails
Use your finger and thumb to squash aphid colonies or use biological control in the greenhouse.
More info on Aphids
Sever the head with a sharp knife when the leaves are creamy white.
Harvest ‘cut and come again’ leaves with scissors.
‘Despa’ AGM:An attractive frisée type which is resistant to ‘bolting’.
‘Frenzy’ AGM:Compact and uniform with very finely cut leaves – used in top restaurants.
‘Lassie’ AGM:High yielding and well flavoured, with a very deeply cut leaf.
‘Natacha’ AGM:A tasty, hardy Batavian or Escarole type, for winter sowing. Resistant to ‘bolting’.
‘Golda’ AGM:A short-leaf Batavian type. Hardy for winter cropping, does not need ‘blanching’.
‘Cornet de Bordeaux’:An old variety - very tasty and extremely hardy.
‘Wallone’ AGM:Large, vigorous and high yielding with rich, green, finely cut leaves. Good for ‘cut and come again’ cropping.