As the wood dries, it can split, bend, or warp, so it's not a good choice for making a patio bench. Garden timbers are treated with various chemicals to prolong their lifespan and prevent rotting. The most commonly used wood preservative is chrome-plated copper arsenate or CCA (source). CCA treated timbers are often used in outdoor construction projects to resist rot and damage caused No, not all landscape timbers are treated.
As we have already mentioned, the natural woods of the landscape can be treated or not. In the 20th and 21st centuries, wood was treated with a chemical mixture of arsenic, chromium and copper. The infusion of these chemicals into the wood allowed it to maintain its good condition for several years, making it the ideal choice for landscaping, playgrounds and, apparently, garden borders. Before 2004, garden woods were treated with chrome-plated copper arsenate (CCA) to prolong the life of woods, but arsenic, one of the chemicals used to make this preservative, is extremely toxic to humans and other non-target organisms.
When garden woods are treated with pentachlorophenol or creosote, various parts of the plant may come into contact with the substances. Garden woods used as garden borders or as part of raised beds are in constant contact with the ground. CCA treated garden timbers are still considered safe for use in a variety of outdoor structures, including decks, fences and gazebos, but they should never be used in orchards or where the wood may be in contact with food, such as a wooden garden pot. If you use wood that may have been treated with CCA near an orchard, Thurston County Public Health and Social Services of Washington recommends that you cover the floor before installing the woods with plastic or other waterproof and non-toxic material to avoid direct contact between wood and soil.
Garden timbers are also relatively inexpensive and easy to work with, making them an excellent choice for DIY enthusiasts. However, prior to 2004, gardening timbers were treated with a solution containing arsenic, which may not be safe for use in the garden, especially if you grow edible plants or have pets that could chew on the wood. Untreated woods that are naturally pest and weather resistant, such as cedar, juniper, and redwood, are ideal for use in gardens, or you can research non-wood landscaping woods, which are usually made of plastics, metals, and wood composites that contain recycled wood fibers. When selecting garden timbers for your project, ask how they were treated so you can choose the right option before buying.
Prior to 2004, copper chromate arsenate (CCA) was used to treat garden timbers and increase their lifespan. Landscape woods are a versatile and attractive way to add structure and visual interest to your landscaping. For the most durable ladder, use treated garden woods for the stringers (the supports that run perpendicular to the steps) and untreated wood for the steps (the surface of the step). There are several types of gardening woods that are perfectly safe to use in your garden, whether you are growing ornamental or edible plants.
While there are many different fencing materials available, garden timbers have a unique look that can enhance the aesthetics of your home. Designing your treehouse with landscaped woods is a fun and rewarding project that the whole family can enjoy.