More often than not most of us simply put whatever soil that is in our backyard into the pots for our new plants. This is not always a very good thing for the plants whose home the soil will soon be. The soil from your yard can be filled with weeds, all kinds of seeds, insects, and possible fungal diseases that will wreak havoc on your plants. Soil from your yard may also be too dense for a pot and will not allow water to drain correctly. It is best to buy a potting soil, preferably one with time-release fertilizer and moisture retention. If all they have is regular soil you can buy the fertilizer and water-retaining crystals and add them to the soil. Most potting soils you buy are going to contain a mixture of peat moss, pine bark, and either vermiculite or perlite (each company has their own mix). Look for a potting soil with these basic types of ingredients and you should be fine. If you cannot afford or do not want to use all potting soil for your potted plants you can mix the potting soil and soil from your yard in equal portions. This will help more than only using soil from your yard.