Sow indoors from March to May in trays of seed compost in an unheated greenhouse or windowsill or outdoors in May-June in a seed bed covering lightly with fine soil. Depth 0.5cm/quarter-inch. Transplant at 2-4 leaf stage to further pots or trays. Gradually harden off to accustom young plants to outside conditions. Plant out in September-October. Transplant to flowering position in autumn. Flowers in June-September, the following year.
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