Keep the space between the rows the same as the space between the plants in a row. For example, if the packet directions say to thin seedlings to 8 inches apart in the row, space them so they're separated by 8 inches in all directions. A little extra space can be provided by staggering rows within the wide row or bed. Careful planting and thinning will result in crops reaching their potential. Soil has good drainage.
Cultivation is easier if soil is loose.
Deeper soil permits closer spacing of plants. Beds look neat, encouraging good sanitation Fact Sheet 1641 provides specifics on raised bed gardening, Reference Veg.2. To further save space, grow plants vertically. For example, cucumber and winter squash take up too much space to be justified in a small plot. Additional support may be required as large, heavy fruit matures.