Sow
0.5 inches (1.27 cm) deep with a guideline distance of
5.94 inches (15.24 cm). Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Toy Choy about 14 days before your last frost date.
As Toy Choy is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.