Understanding pH management starts with your choice of growing media components, the crops you choose to grow in them and how you intend on irrigating them. Currently there is a wide range of media components available to the nursery industry. They may include but are not limited to: pine bark, peat, coir, sand, perlite, vermiculite, absorbalite, peanut shell, rice hulls and the list goes on. Some decisions on which components to use are dictated by what is available locally and for some it may be the cost of the growing media landed on your property.