Keep in mind when planting that Prima Donna Shimmering Pink is thought of as tender, so it is really important to ensure that the outside temperature is well above freezing before planting or moving outdoors.
By our calculations, you should look at sowing Prima Donna Shimmering Pink about 91 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Prima Donna Shimmering Pink is a tender plant.