Zone 3A .. I know they have Purps in Z3 as I saw them.What hardiness zone in Ontario?
Thanks!Purps are fine with no preparation.
I would prepare a patch of soil. Cover with a thick layer of pine needles (2-3"). Make sure there is a consistent layer of about a foot of snow. Use a temperature logger. If the soil surface temperature stays at or above 0°C for the winter, you can grow Sarr's except for maybe psittacina or minor.