When should I replant my orchid?

You should consider replanting your orchid when it becomes root bound, which is when the roots have filled up the pot and are starting to come out of the drainage holes. You can also replant an orchid if it’s not doing well and you think a change of potting mix will help, e.g. from soil to sphagnum moss. However, if you orchid is healthy, you don’t need to repot it even if it’s root bound.