Raised Garden Bed Height
Aside from the technicality that raised garden beds measure at least 6 inches tall no other written or unwritten gardening rules dictate the maximum height for a raised bed garden.
Raised garden bed height. More soil also holds more moisture so a deeper raised bed will require less frequent watering. Raised beds typically range from 12 inches to 18 inches with a maximum of 36 inches in height. Your raised bed depending upon where you site it may also allow you to do greens over the winter as well. It is possible to install a raised bed on poor or compacted soil or even on concrete.
The height of a planting bed depends largely on the soil underneath and the type of plants you re. Raised bed gardens may range from heights of 6 inches to 6 or more feet above grade. If garden beds are required to span long areas it s best to build multiple shorter beds. And raised beds altho warming up earlier and staying warm later need to be watered more often.
These taller beds enable deeper rooted crops to be planted even if there is no soil beneath the bed but drainage must be provided by blocking the bed up an inch or so or drilling drain holes near the bottom of the bed sides. Raised beds should be 8 inches or taller advertisement there isn t a maximum soil depth limit for a garden but there is a minimum depth requirement at least for vegetable gardens. While raised beds are commonly 8 12 tall some raised beds have sides which are 3 or higher. This method will use more materials and therefore be slightly more expensive.
In general the more soil depth that s available to your plants the more freely their roots will grow.