I've bought Yellow Doll at the Farmers market but I've never tried to grow it.
When I grew sugar babies I started them in peat pots, made a mulched mound for each peat pot and set them up in a cold frame. I put straw bales on 3 sides too to help insulate it and left the south side uncovered to help maximize the sunlight it received. Goal was to get them as warm as possible and let them trail, so they transplanted easily.
I got good germination and then moved that mulch, and added more mulch ground temps stable and dry.
When I grew sugar babies I started them in peat pots, made a mulched mound for each peat pot and set them up in a cold frame. I put straw bales on 3 sides too to help insulate it and left the south side uncovered to help maximize the sunlight it received. Goal was to get them as warm as possible and let them trail, so they transplanted easily.
I got good germination and then moved that mulch, and added more mulch ground temps stable and dry.