Sow at a depth of approx.
0.25 inches (0.64 cm) and aim for a distance of at least
3.96 feet (1.22 metres) between Rose plants.
By our calculations, you should look at sowing Constance Spry about 35 days before your last frost date.
Constance Spry is hardy, so ensure you wait until all danger of frost has passed in your area before considering planting outside.