The downside is that space set aside for footpaths cuts down on the number of vegetables you can plant.
Place plants single file in rows at least 18 inches apart so you can walk easily between them. This approach makes the most sense for large vegetable gardens because rows make it easier to use mechanical equipment, such as tillers, to battle weeds. The downside is that space set aside for footpaths cuts down on the number of vegetables you can plant.