I ordered two Dorothy Perkins and it will be mailed next week, Oct 12. I guess it will be too late to plant this in the ground as first frost is around the corner, so I will be planting this on a pot. Is the store bought potting soil with fertilizer mixture safe to use? And where will I hide my plant from the cold? I mean place it out when temp is above freezing then hide it in the garage when there is freezing temp coming?