hey gardeners! This spring I bought four hayrack style window boxes. I filled them with potting soil and planted annuals. Question is: when the annuals die this autumn, should I remove the soil from the coco liners or just pull the dead plants out and put the whole deal in the basement for winter? How many seasons can I expect to get from the coco liners before they should be replaced? How will I know it's time for new liners?