May 02, 2017 · HORT 306 Quiz 7 Spring 2017 Question 1 1 out of 1 points What are Raised Beds as described in this course? Selected Answer: Raised Beds are elevated beds of soil to improve the drainage used in medieval gardens in Europe.
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Raised beds make gardening possible on sites where growing plants would otherwise be impossible. Rooftop gardens and raised beds on top of solid rock are examples. Terraced raised beds turn hillsides into productive growing areas while reducing soil erosion potential.
Raised beds can be made wheelchair accessible by making the walls about 2 feet tall and limiting the width of the bed to about 3 feet. Figure 7. To double dig prior to establishing a raised bed, remove all the soil from the bed one spade's depth. Dig the next layer down, leaving the soil in place.
(opens in new window)#N#Advantages of raised-bed gardening 1 Better drainage#N#Growing plants in raised beds is a logical choice for gardeners with heavy, poorly drained soils. Raised beds permit plant roots to develop in soil held above water-logged or compacted zones. This soil environment is much better for root growth. As beds are built up, compost or other forms of organic matter may be incorporated, further improving soil structure, drainage and nutrient-holding capacity. 2 Higher yields#N#Better root growth from improved soils leads to higher yields for food crops and lusher growth of ornamental plantings. Also, intensive planting in raised beds means more plants can be grown in a smaller area than with conventional row-cropping techniques. No space is wasted between rows. 3 Expanded growing season#N#Better drainage speeds soil warming and allows earlier spring planting. In wet seasons, soil dries faster, so planting can proceed between rains. 4 Easy maintenance#N#Because plants grow above the level of walkways, less stooping is required for weeding, watering and other chores. Intensively planted raised beds provide dense foliage cover, shading out much weed growth. 5 Using difficult sites#N#Raised beds make gardening possible on sites where growing plants would otherwise be impossible. Rooftop gardens and raised beds on top of solid rock are examples. Terraced raised beds turn hillsides into productive growing areas while reducing soil erosion potential.
Soil in raised beds warms faster and dries out more quickly than soil at ground level. In spring and fall, these traits are desirable. They are less desirable during the heat of summer.
Good-quality existing topsoil may be used in raised beds. However, the addition of organic matter to any soil will improve its physical and chemical makeup, thus making it more productive. Peat moss, compost and decomposed manures are good sources of organic matter.
Walled raised beds may be used in the landscape or for vegetable gardens. Besides controlling erosion better than temporary beds, walled beds permit deep soil amendment. Although constructing walls for raised beds takes labor and has an initial cost, the finished product should last for many years. Figure 2.
When planted and mulched, berms need no edging to keep the soil in place.