Most orchids need to be repotted
Probably. Although orchids like to be somewhat crowded in their container homes, most orchids need to be repotted once every 1 to 2 years. The bark or moss that the orchids are grown in gradually deteriorates. If repotting is not done, the bark or moss becomes decomposed and packed down. When this happens, the roots don’t get properly aerated and drainage can become blocked, leading to root rot.
Ideally, orchids should be repotted immediately after flowering. For best results, orchids should be grown either in sphagnum moss or a fine-medium orchid bark mix. You can also combine the two. Orchids do not grow well in soil, because that is not how they grow normally. Most are found in the tree canopy high above the jungle floor. Make sure your new orchid pots have good drainage.