Keep in mind when planting that Argenteo-guttata is thought of as tender, so it is imperative to wait until temperatures are mild before planting out of doors.
By our calculations, you should look at sowing Argenteo-guttata about 91 days before your last frost date.
Ensure that temperatures are mild and all chance of frost has passed before planting out, as Argenteo-guttata is a tender plant.