Sow seeds 6mm (1/4in) deep in rows 45cm (18in) apart between May and August.
When large enough to handle, thin the seedlings to 30-45cm (12-18in) apart.
Good King Henry grows in most reasonably light, rich soils.
Water regularly during dry periods to prevent plants going to seed prematurely.
Being hardy, it will provide pickings through the winter if covered with a cloche or similar protection.
Harvest as required, ensuring that enough leaves are left to continue growth.