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Ship from US, delivered from 4 to 14 days.Sunflower Mongolian Giant producing flower heads up to 45cm (18in) across with individual seeds up to 3½cm (1½in) long.As well as producing large yellow flower heads, Sunflower Mongolian Giant will be the envy of your neighbours as it grows up to 420cm (14ft) tall.Sow directly outside as early as possible to miss heavy frosts (mid-April through mid-May). Ideal for: Cottage gardens, wildlife gardens.Seeds can be scattered very thinly over the surface of the soil or can be placed into the soil in a block arrangement. Sow 5cm (2in) deep, at 20-25C (68-77F) . When large enough to handle, thin to 45cm (18in) apart.