Sow
0.25 inches (0.64 cm) deep with a guideline distance of
3.96 feet (1.22 metres).
By our calculations, you should look at sowing Robin Hood Floribunda Shrub about 35 days before your last frost date.
As Robin Hood Floribunda Shrub is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.