Linked from
The 10 pages that link to Raised bed gardening, each with the reason it gives.
WaterloggingRelated: Raised beds improve root-zone drainage where native soil stays saturated.
Soil aerationRelated: Raised beds can improve drainage and aeration in wet or dense sites.
Herb gardenRelated: Raised beds offer a defined space and greater control over soil and drainage.
Summer squashRelated: Raised beds provide one practical way to grow summer squash in limited space.