Facts about soil that are needed to know when preparing soil for planting.Once the location has been selected, there should be a close water supply and ample sunlight to start a garden. Ideal soil should be light in weight, rich in color and texture with evenly balanced pieces of organic material throughout.Facts about soil conditioning, drainage, PH and nutrient balances are key to setting up a garden with strong prevention practices. Many garden ailments can be prevented at this phase of creating a tomato garden.Now it's time to get the dirty facts about soil! If this is a new garden location there should be some existing top soil. Top soil could be anywhere from 2 inches to one foot deep. Don't assume this is the make up of the garden's soil. Lying beneath could be a sand, mud or clay consistency base soil.