The correct potting mix for your orchid depends on your environment as well as the type of orchid. Some blends contain small particles that are best for seedlings; others have larger particles that are better for thick rooted orchids. Steer clear of any potting mix that lists “secret ingredients” or no ingredients at all. You need to know precisely what you are potting your orchids in. Aim for a fresh mix with coconut husk chips and give it a good rinse before potting your orchids with it.