in) deep at monthly intervals from about 4 weeks before the last frosts; earlier crops can be multi-sown indoors (see page 135). Sow maincrops at least 12–14 weeks before autumn frosts. Thin several times, keep weed-free until large enough to mulch, and water every 2–3 weeks in dry weather. Start pulling alternate roots when 5cm (2in) across, about 2 months after sowing. Lift and store maincrops like carrots after twisting, rather than cutting, off the foliage.
WHEN TO SOW Late spring to late summer; from late winter under glass
GERMINATION 2 weeks at 7°C (45°F) minimum
SPACING 10cm (4in) in rows 23–30cm (9–12in) apart; or 15cm (6in) square
TIME TO MATURITY 8–16 weeks
HEIGHT 15–30cm (6–12in)
AVERAGE YIELD 450g (1lb) per 30cm (12in) row
VARIETIES ‘Alto’, ‘Boltardy’, ‘Burpees Golden’, ‘Chioggia’, ‘Cylindra’, ‘Forono’
Radishes Raphanus sativus
One of the fastest crops from seed, radishes have red, white or bicoloured roots in a range of shapes and sizes. Summer varieties with small, mildly flavoured roots are successionally sown over a long season, often as a catch- or intercrop (see page 142
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