I have Strawerry plants in 2 liter bottles , planted in 3/8's pea stone, and they have done real well. My question is "How do I care for the plants this winter". In our region winters are very cold, and I would like to know what to do to my plants to hold them over the winter. The plants are very healthy, with runners attached. I do not heat my greenhouse during the winter season. I would appreciate any sound advice from strawberry growers.