Garden / June 14, 2018 /
A raised bed is ideally 18 - 24 inches deep, but if you are building your raised beds on top of existing earth you wilI have some leeway here. I have successfully gardened in boxes built over earth with only one foot of soil depth. You can find both detailed instructions for building a raised beds and multiple choices for buying raised beds here.
The ideal soil type for growing most crops is loam, the rich halfway point between clay and sandy soils. If you are not sure which soil type you have, hold some in the palm of your hand, wet it and try to make a ball. If it forms a tight, hard wad, then you have lots of clay in your soil. If you can not form a ball, you have sand. If the ball forms but pretty easily breaks apart, you probably have loam. No matter which type you have, you can improve both your soils structure and fertility by working compost into the top layer each year. Those with really limited space can take heart in knowing there are effective composting options suitable for even the smallest of spaces.