Orchids prefer a well-drained growing medium to prevent water from pooling around their roots. Orchid potting soil is typically made of lightweight, porous material, such as pine bark or coconut fiber, that allows for good drainage. When using orchid potting soil, it is important to follow the watering recommendations specific to your orchid. In general, it is best to water orchids when the soil is almost dry, avoiding overwatering. Additionally, you can use a specific orchid fertilizer diluted in the watering water to provide the necessary nutrients.