How much good stuff you need
Wonder how much good stuff you need?
This page can help you quantify your needs.
To find how much you need, just multiply the surface area by the depth of your container (e.g. basket, bed, garden, lawn). Remember to keep all measurements in the same unit. For instance if your bed is only 6'', use 0.5 ft! There are 27 cu ft in a cubic yard, and 1000 L in a cubic meter. And 1 cubic yard = 0.76 cubic meter.
Click on the links below for tools that can help you to:
calculate the volume of simple shapes (e.g. square, rectangular)
calculate the volume of more complex shapes (e.g. triangle, circle)
determine the surface area of irregular shapes (e.g. backyard).
Depth, and how to limit required volume
All plants don't have the same depth requirements. For instance, radishes or lettuce can do with 4-6'' inches, but tomatoes would require much more. For new beds, a good practice to limit the volume of good soil you need to purchase can be to provide just enough depth and fill the bottom with rotting/semi-composted wood (small logs, branches, twigs), cheaper topsoil, or even inert material such as rocks or even styrofoam. Click on the link below for a great resource and chart to
evaluate optimum depth for a variety of plants (vegetables, herbs, berries, and others).