[PhalPal]

booboo - brookn is right; I cut my spikes at the bottom when all blooms are gone. My perpetual bloomer just never stops sending up new spikes. It's all in the genetics; nothing I do causes it to do this. I really don't like draining the plant for possibly a few more, inferior flowers. Instead I cut it off and let the plant put it's energy into new growth of roots and leaves, and of course next year's blooms.
jsa1840 -Your spike is dying off because it has served it's purpose and turning brown is very normal. Cut if off as close to the bottom as you can. I use a single edge razor and I use it only once for each orchid. Throw it away when you are done. Continue to water and care for your plant just as you always have and your orchid will be fine.