Here is a good site that can give you basic culture information for your types of orchid.
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It may be that your orchids are not getting enough light for blooming. Phal spikes are supposed to dry up after the blooms die off, so you didn't do anything wrong. A little more information on where you grow your plants, i.e. windowsill, outdoors, southern exposure versus northern type iof nformation will help us help you.
And Welcome to the group soo.coop!
