Try to aim for a seed spacing of at least
11.7 inches (30.0 cm) and sow at a depth of around
1.95 inches (5.0 cm). Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Red Aztec about 10 days after your last frost date.
As Red Aztec is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.