Right now is a good time to repot some of your orchids if they are overgrowing their pots. You can also tell when its time to replace potting media when it finally breaks down. The fur-bark I put my plants into usually lasts about 2-3 years depending on watering.
A good rule of thumb is if the plant's roots are hanging out of the plant, it is probably in need of replanting. Some plants don't handle repotting that well. That includes some Dendrobiums and Aerangis genera. When you do repot, make sure to have a pot that is 2" bigger than the one it's currently in. Since orchid species and genera vary so much, it's best to consult the PDF's on the AOS.org website to find out specific potting recommendations for your plants.
Most people start out with Phalaenopsis, Cattleyas, or Paps. If you have a question abour repotting, look at the plant roots and potting media. Are the roots overgrowing the pot? Is the media breaking down? Do you have a tag with the plant's name and last time it was repotted?
If the plant roots are healthy and not overgrowing the pot and the media is still relatively solid, you can probably get away without repotting...
The next article I'll do will go into the specifics of repotting Cattleya orchids. I just repotted a bare root Cattleya hybrid. It didn't take that long. But I wasn't dividing the plant and I put into a relative large plastic orchid pot.
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