A few months ago I re-potted some of my phalaenopsis orchids which had finished blooming. This was my first time, so I wanted to wait awhile to make sure it was successful, but the orchids are doing well (and budding and adding leaves and generally quite happy) so I'm confident that it went well. Here's what I did:
Supplies: Sphagnum Moss, New Orchid Pot, Scissors
2) Remove the orchid from its old pot. In my case, the orchids had a plastic pot inside the pot they were in, so I had to cut it off.
3) Remove old moss/potting material. The purpose of re-potting is not just to give the orchid a bigger space to live in, but also to remove old decaying potting material. The potting material will be very tightly wrapped around the orchid, so be careful when pulling it out. You may need to cut out sections at a time. The roots of the orchids come in two varieties: roots growing under the potting material, and roots growing in the air. Make sure you know which are which (the air roots are shiny), because when you re-pot the orchid you will need to keep them the way they were. You may also find some dead/decaying roots. These will be black. These should be snipped off with the scissors to prevent them from rotting anything else.
4) Now that you have your orchid and its healthy root system, you need to start re-potting. I used sphagnum moss because it looks good and I'm accustomed to watering orchids in sphagnum moss. The trick to re-potting is to get a TON of moss around the orchid (note: some people recommend soaking the moss before re-potting, but I did not do this). First I took a large ball of moss and put it inside the space directly under the plant which the roots wrap around. Fill this as much as possible. Next, I put some moss at the bottom of my new pot. I put the plant part-way into the pot, then continued packing in moss around the outside of the roots. You shouldn't be able to easily lift the orchid out of the pot once you've added enough moss, so keep adding until it is well wedged in.
5) Finally, add some water. You'll want to water lightly for the first watering or two after re-potting so the plants can adjust, then go back to regular watering after a few days.
My orchids have been doing quite well since I re-potted them. They have new leaves, new roots, new spikes, and lots of new buds!
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