Keep in mind when planting that Mystique 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 Mystique from seed
By our calculations, you should look at sowing Mystique about 91 days before your last frost date.
Transplanting Mystique
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Mystique is a tender plant.