Sow at a depth of approx.
1.95 inches (5.0 cm) and aim for a distance of at least
11.7 inches (30.0 cm) between Sweet corn plants. Soil temperature should be kept higher than
18°C / 64°F to ensure good germination.
By our calculations, you should look at sowing Indian Summer about 10 days after your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Indian Summer is a tender plant.