Keep in mind when planting that Duchess is thought of as tender, so remember to wait until your soil is warm and the night time temperature is well above freezing before moving outside.
Growing Duchess from seed
Start seeds indoors six weeks before last frost date.
Transplanting Duchess
Plant to the first set of true leaves to promote strong root growth.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Duchess is a tender plant.