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.

French Breakfast - 25 days. Roots oblong and blunt with small tap roots. Skin rose-scarlet with a white tip. Flesh white and tender. Tops medium sized. Popular for home garden, but does not stand long before becoming pithy. Suitable for forcing under glass.