- Start the seeds outdoors once the soil has warmed in May-June.
- Sow the seeds thinly on the surface of a well‑prepared seedbed and don’t cover.
- Keep the soil consistently moist until seedlings emerge.
- Seeds will usually germinate within 14-21 days under favourable conditions.
- Once seedlings are large enough to handle, thin them to about 10-15cm apart.
- Choose a sunny or partially shaded, well‑drained site for best growth.
- Water regularly during dry spells until established, but avoid waterlogging.
- Deadhead spent flowers to encourage continued blooming and prolong the display.
