Over wintering plants
I recently bought two Dahlia plants, Bishop of Llandaff and Mystic spirit also a Cosmos 'chocamocha' plant as i want to redo a border in my garden. It then dawned on me that i should maybe have waited untill spring to purchase them as im sure they cannot stay in the ground over winter, they are still in the pots i purchased them in. I was hoping someone could give advice as to the best way of overwintering them i do have an unheated greenhouse, but never seem to have much luck with overwintering plants. Also is it possible to take cuttings/safe seeds from all three. Many thanks.