Exercise 1 solution Example answer (yours will differ), for radishes: Sow window: March to September (check your packet). Depth: about 1 cm. Spacing: thin to 2-3 cm apart in rows about 15 cm apart. Days to harvest: about 4 to 6 weeks. Indoors or outdoors: outdoors. Radishes are quick and hardy, and sown direct they avoid root disturbance and need no hardening off.