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