Keep in mind when planting that Multi-petalled Picotee Collection is thought of as tender, so it is really important to plant out well after your last frost date.
By our calculations, you should look at sowing Multi-petalled Picotee Collection about 91 days before your last frost date.
As Multi-petalled Picotee Collection is tender, ensure temperatures are mild enough to plant out - wait until after your last frost date to be on the safe side.