July 5, 2007 - We think of our gardening as greening the world, but it generates a lot of plastic garbage. Gardeners may not realize how much. Just four of those pots are the No. 2 and No. 5 plastics acceptable to our recycling contractor. Also headed for the landfill: two bottles from fish and kelp emulsion, 21 plastic bags from mulch, compost and fertilizer, and 148 plastic plant labels.