Landscape Timbers: What You Need To Know - ImproveNet May 6, 2015 ... Landscape timbers are used to build planter boxes and raised beds for gardening. ... Decks, Patios, & Porches, Landscaping ... wall, reinforce a slope, make garden steps or build a picnic table and landscape paths. ... Treated wood is easy to cut and looks great for paths or edging closer to the home.