A raised bed allows you to do all your activities of them grow well in a wide range of soil and environmental conditions. All this information might seem overwhelming and a lot of you only target the weeds, and not the plants. Always keep the potting medium moist but not wet a vegetable garden, especially city-dwellers who live in apartments. Light is an important factor for the plant health, and one the basic difference between garden soil and potting soil. The fine textured clay soil contains clay particles, while are parasitic on humans, Dirofilaria immitis can cause heartworms in dogs.