Keep in mind when planting that Tower White is thought of as very hardy, so this plant will survive though longer winters with little or no damage.
Try to ensure a gap of at least
11.89 inches (30.48 cm) when sowing to prevent overcrowding your seedlings.
By our calculations, you should look at sowing Tower White about 56 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Tower White is a very hardy plant.