Raised Cedar Garden Beds - When growing vegetables in raised garden beds using the Square Foot Gardening approach, your beds will have to be sectioned off into one-foot sections called planting squares. A 4x4 foot garden bed, for example, will have 16 planting squares (because there are 16 square feet in a 4x4 bed). Each planting square comes with an address used to identify the square.
While the options for addressing change, among the most straightforward is to make use of letters for columns and numbers for rows, and the combination of the two identifies the square. Numbering beginnings in the upper left corner and proceeds left to right, top to bottom. For example, planting square A1 is the upper left hand square (1st column, 1st row), while planting square C4 is the square in the 3rd column and the 4th row. I've yet to locate a commercially accessible garden bed for marking off planting squares with an enclosed feature.
I wish somebody would build a Square Foot Gardening grid which you can fit into a garden bed that is raised to mark off squares, should you intend to use the Square Foot Gardening approach, but until that is accessible, you will need to devise your own method for marking squares off. The initial step is to calculate the measurements on the interior of the garden bed, which will be the length and width that's truly usable for planting.
But when you join the boards in the corners, you lose several inches, or so the interior measurements of the garden bed are actually a few inches short of the advertised size. In my own case, my beds have an interior dimension of 46.25 inches x 94 inches. I refer to these measurements as Useable Span for the rest of the article.