We were wanting to know If we use tires and line them with the lawn bags with holes to promote drainage and fill with potting soil, peat moss, compost mix if this will work for almost all of our gardening this year we are in zone 6. we would make the tires two high. we would like your oppinion on this type of gardening and if we decide to plant early this wouldn't be hard to cover. Thank You Mr. Dennis Hayes