- Begin sowing the seeds indoors from March-April or September-October.
- Scatter the seeds thinly on the surface of damp seed compost and lightly cover.
- Keep trays in a propagator or cover with clear polythene, maintaining a steady temperature of around 17-20°C.
- Place the seeds somewhere dark until germination, which usually takes 10–20 days.
- If there’s no germination after 20 days then cold stratify for 6 weeks.
- When seedlings reach about 5cm tall, move them carefully into individual pots or modules.
- Harden plants off gradually by exposing them to outdoor conditions for short periods.
- Transplant into borders, baskets, or containers once frosts are no longer a risk (late spring to early summer).
- Feed regularly with a balanced liquid fertiliser to support healthy growth and prolonged flowering.
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