There is no need to dig over the soil - a process which is thought to damage the soil's natural structure.
Weeds are reduced. By creating a barrier between the growing area and the natural surroundings, there is less chance for weed seeds to spread.
Soil compaction, which is so damaging to soil structure and plant growth, is reduced. Soil in containers is rarely walked on, making it excellent for both plant and soil health.
Soil erosion is also reduced.
Yields are increased; raised beds are the perfect setups for closer clustered plantings.
Soil is contained and kept away from path or buildings.
Compost, mulches, manures and other soil conditioners can be layered to improve soil quality, reducing the need for fertiliser.
It is easier to improve drainage, a real boon if your garden has heavy clay soil or a high water table. Plants have at least another foot of breathing space above wet conditions. Raised beds drain better too.
Line with waterproof membrane to improve water retention in sandy conditions.
Raised beds over 300mm reduce debilitating back and joint pain
They look great - the clearly defined edges make the surrounding area easier to maintain
It is easier to keep out pests. Slugs and snails can climb, but they are easier to spot and deterrents can be used. Larger animals can be kept out with fencing and bird barriers are easier to install.
Raised beds can be planted earlier in the season. The soil dries and warms more quickly in spring. Also many plants will overwinter more successfully if the soil is untilled and enriched with compost.
Raised beds can be moved, if you need to move them.
Raised beds are ideal for children or inexperienced gardeners. Although there is higher initial investment, the effort required is reduced and the chances of success are improved.