Aim to sow
0.23 inches (0.6 cm) deep and try to ensure a gap of at least
11.7 inches (30.0 cm). Soil temperature should be kept higher than
5°C / 41°F to ensure good germination.
By our calculations, you should look at sowing Bunyard's Matchless about 60 days before your last frost date.
As Bunyard's Matchless is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.