Aim to sow
1.17 inches (3.0 cm) deep and try to ensure a gap of at least
2.28 feet (70.0 cm). Soil temperature should be kept higher than
15°C / 59°F to ensure good germination.
By our calculations, you should look at sowing Buttercup Green BonBon F1 about 10 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Buttercup Green BonBon F1 is a tender plant.