Generally there are two species grown in the UK they are;
bicolour; which is an annual that grows to around 600mm high producing 50mm diameter bi-coloured flowers with a black central cone from July to August.
fulgida; is a bushy perennial, that grows from 600- 900mm high, and spread to around 500mm (18")
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The 60mm diameter yellow to orange flowers with a brown/purple central cone, are produced from July to September.
Cultivation;
Week 13; Sow seeds of both species in pots/trays of seed compost and germinate at a temperature of 18°C (68°F).
Germination should take about 5-7 days.
Perennials are treated the same as annuals but grown on until planting out time (Week 40)
Week 15: Prick out the seedlings, when large enough to handle, grow on in a cold frame until planting out time.
Week 21; Plant out 200-300mm (8"-12") apart in well drained garden soil with a sunny or partially shaded aspect.
Prior to planting out, dig in copious amounts of well rotted manure.
Dead head flowers regularly to encourage further flowering,
Week 44; Cut the stems of perennial varieties down to ground level.
Plants can be divided and replanted now or in spring when new growth commences.
