Aim to sow
0.23 inches (0.6 cm) deep and try to ensure a gap of at least
1.95 inches (5.0 cm). Soil temperature should be kept higher than
15°C / 59°F to ensure good germination.
By our calculations, you should look at sowing Lavance Purple about 1 days after your last frost date.
As Lavance Purple is hardy, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.
Angustifolius is Latin for "thin"or “narrow”.