The oyster mushroom is so named because it looks similar to an oyster and is available in a wide array of colours, including white, yellow, brown, blue, black and pink, all tending to fade to a creamy gray when cooked. These are by far the easiest and least expensive to grow. Many growers are now using straw as the growth medium. This results in a loss of flavour, texture, and shelf-life. Adding the natural host of wood, like chips or sawdust will produce a more defined body and flavour character.