Radishes grow best in the spring or late summer. They do not like hot weather. For quality yields, radishes should be grown rapidly with plenty of moisture. Approximately 80 seeds/gram.
Hints:

Sow seed 1 cm apart and 1 cm deep in rows 30 cm apart.

Thin to 2 to 4 cm apart.

Sow several times at weekly intervals until early summer for a contiuous fresh supply.

Try sowing with other vegetables to help mark row.

White Icicle - 30 days. The best early white variety. Tops are small, roots are long and tapered. Very white throughout, with a mild sweet flavour. Brittle as ice. 13-15 cm [5-6"] long.