If you don’t have a mason line, any other kind of string can work just as well. For ease of access, try not to have your timbers set at a width of more than 4 feet (1. 2) meters from each other if you’re planning on creating a garden. [2] X Research source Although the length of the rectangle can be as long as you’d like, if the rectangle is too long, it’ll be difficult to reach your plants without stepping in your garden. [3] X Research source
If you’re working on a shallow slope (under 10 degrees), dig approximately 8 inches (20 cm) into the ground from the higher end of the slope. For steeper slopes, dig 12 inches (30. 5 cm) into the ground. [6] X Research source
To add longevity to your timbers, add a layer of sand or gravel about an inch (2. 5 cm) thick to the bottom of your trenches. [8] X Research source
This step is optional—if you aren’t worried about weeds in or around your trenches, it’s okay to skip this step.
To make sure your timber edging lasts for a long time, use rot-resistant wood. Cypress, cedar, redwood, or pressure-treated wood can last beyond 7 years, while less durable options might need to be replaced earlier. [12] X Research source
This step is only necessary if you want a taller garden edging. If you’re satisfied with the height of a single layer of timber, there’s no need to install a second.
If you have 2 or more layers of timber, drill through all of them at the same locations.
