TerraDeck composite decking products are made from 94 percent rapidly renewable and reclaimed materials (wheat straw) and recycled plastics. These materials produce products that are sustainable, strong, and longer-lasting. They also retain color better and resist moisture, insects, and sunlight with minimal maintenance. Cost: $3.30 per square foot. Natures Composites. 877-810-4029. www.naturescomposites.com.