The raised bed is the nucleus of an intensive vegetable garden.
It concentrates soil preparation in small areas, warms up more quickly in spring, stays warmer longer through summer and into fall, limits foot traffic to established walkways between planting beds (reducing soil compaction) and helps conserve water. Although it does require more frequent watering due to higher plant density, a raised bed is more efficient overall. It results in higher yields for the amount of water applied, compared with larger areas watered in traditional row-walkway-row culture.
Raised beds make it easy to create a deep, fertile soil that’s high in organic matter. It allows you to completely amend your native soil – the ideal situation – or to bring in as much as 100 percent of any soil mix you’d like to fill the beds. You even can go “specialized,” making a mix that’s ideal for each of the plant types to be
grown for each separate bed.
From a mechanical point of view, a raised bed facilitates better runoff (water that moves across the surface of the soil) and drainage, is easy to cover for spring and fall frost protection, can be shaded during the hottest part of summer and is ideal for enabling people with limited mobility to garden. These beds are generally 4 feet wide and can be as long as desired. The height can be almost any dimension, although 12 inches seems to be universal and allows for good root development. (It’s the minimum height when working with hard native soil.) For watering ease, the beds should be reasonably level, both across and length-wise.
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