Repot your Dendrobium King in spring every year, at the beginning of its active growing season. Begin by removing your plant from its pot, shaking off all growing material and then rinsing the roots under tepid running water. Discard all of the old potting medium.
Clip off all dead roots and those that are not light colored and fleshy. Be sure to cut these roots back to healthy tissue. Discard old roots.
Cut your unpotted Dendrobium into two or more pieces to make additional plants if it has grown large and is rootbound. If it is small, skip this step.
Place about 1 inch of fresh orchid bark into the bottom of a clean pot that has at least one drainage hole.
Set your Dendrobium King orchid, or one of the pieces you separated, into the pot. Fill the pot almost to the top with fresh bark.
Keep your Dendrobium King orchid in a warm, humid environment that receives bright indirect light. Allow the bark growing medium to dry slightly between waterings.