6 Reasons to not build raised beds. It was originally for weed control and Im pretty sure it was recommended in the book Im a new gardener so I followed the book closely. Raised Bed Gardening Usu In a hot and dry climate. . This may be the biggest reason not to use a raised garden bed. Only show this user. You need more substance than what potting soil can provide. Raised beds arent a new idea yet they continue to be a hotly contested item of debate amongst gardeners. Discussion Starter 4 Apr 21 2016. Weed Control is the same as a no-till garden. Plants require more water when it is dry windy or in the summer heat. Raised beds are particularly suited to areas where conventional gardening is challenging due to a short growing season or dry desert climates or poor soil conditions or endless other problems. Start seed indoors under a grow light a few weeks before the last frost. This gives yo