<human>:  How much soil should I use to start a vegetable garden?
<bot>: The amount of soil you need to start a vegetable garden depends on the size of the garden and the type of soil you are using. A general rule of thumb is to use 4-6 inches of topsoil to fill the garden bed. You should also add organic matter such as compost or shredded leaves to the soil to help with drainage and aeration. Make sure that you mix in any additional soil amendments to ensure that your plants have the right nutrients to thrive.