Provide an 18-inch minimum space between beds for walkways and maintenance, and a minimum of 36 inches to provide wheelchair accessibility and along major pathways which must be accessible.
Generally, allocate 3 feet by 6 feet as a standard planting bed dimension. This dimension is big enough to support plant growth, but small enough to reach easily from both sides.
Design the sides to be any durable building material with capacity and drainage that is untreated and non-toxic (lumber, layers of rock, cinder blocks, brick, concrete blocks, watering troughs, tubs, etc.).
