It all depends on your lighting situation. We have 3 pockets in an office with no windows & lights off on the weekends. Obviously this would not be ideal for any orchid, but we have many foliage plants doing really well in that office. If you have enough light & the right temps, I'm sure oncidiums will bloom for you.
For phrags or any orchid, I think a separate pot would be best for both watering & fertilizer purposes. The felt pockets I have can't be removed from the wall, so I have to use distilled water & only slow release fertilizer. The planters you're getting can be removed from the wall & taken outside for a good watering, which would help avoid a buildup of salts, but might not be very convenient.
Also, if you use a separate pot you could easily trade out orchids in the wall pocket according to what's in bloom at the moment. That would be a nice way to enjoy your blooming orchids.
If you hang the pockets vertically, I would avoid putting any orchids up too high unless you have plenty of humidity. Our office building has very low humidity in winter, even with fountains added to each office. Where we hung pockets vertically, the top pockets are just over 6 feet high and the top pocket dries out noticeably faster than the any of the pockets lower down due to more heat near the ceiling. Also if there's a heat vent near the area where you will hang your Wally pockets, get one of those magnetic deflectors to keep the heat from blowing directly on the plants & pockets.
If you're going to do a large number of pockets, consider running drip line with pressure compensating drippers for all the pockets. Then when you need to water, bring in a bucket of water, hook up a submersible pump on a timer and it will do the watering for you. I'm in the process of setting this up at my office so I don't have to hand water 19 individual pockets with a pressure sprayer.
Now that you've brought this up, I'm tempted to try these new pockets using only orchids and other epiphytes like Hoyas, bromeliads, anthuriums, birds nest ferns, etc. If you went this route, you could possibly plant the orchids directly in the pocket without a pot, because these plants could all use similar potting media and fertilizer, plus be removed for flushing. Hmmm... I'll also have to look into possibly doing this as a semi hydroponic set up if its not too much trouble to take the planters off the wall & tote them to the bathtub for the weekly watering/flushing that's needed.
Whatever you decide to do, please post pics when you get your pockets planted!
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