Flower care

CCA Alternatives So what will gardeners have to choose from for landscape projects? The EPA has approved alkaline copper quaternary (ACQ) for use in garden structures.This product is higher in copper than CCA, but is free of arsenic. No doubt, additional, environmentally friendly products will be developed in the next few years. Treated lumber alternatives include synthetic wood, made from recycled plastic, vinyl fencing, and naturally rot-resistant woods such as cedar and redwood. All of these will likely be considerably more expensive than CCA-treated lumber was. Non-lumber alternatives for building garden structures include stone, concrete block, and brick.