I bought this phal orchid from Sams a few months ago. I've since cut the flower spike and repotted in a larger pot in a sphagnum mix. The roots seem to be outgrowing the pot. Should I repot it again?

No, repot it once a year! No more then that.

Phalaenopsis roots love to wander. You won't be able to keep them confined in a pot. You will do far more damage trying to confine them.
I have to say that your plant looks very good.
Welcome to the Orchid Forums! There are many threads dealing with Phalaenopsis care, please read them.
Read the sticky about starting out with Supermarket Orchids-Phalaenopsis. It will be of great comfort to you I think.

Thank you! I've been reading the threads. I'll continue doing what I'm doing with this orchid.

Hi. Just wondering how to repot this same orchid when it's time, after it's done blooming. It has a large spike with lots of buds now! I plan to get bark mix as I don't like the moss mixture. I know I'll have to cut the plastic pot to save the roots growing out of the sides. But how to get all this in a new pot? Is there a way to prevent this next time as I'm having trouble finding a good spot for it away from cat.

This is completely normal. Phals are only put into pots to sell, in their natural state they would grow on trees, so the aerial roots are part of the plant's habit. You can try and tuck them into your new pot but in time they will start growing this way again.

I agree!
Don't even try to confine the roots! They indicate a happy plant. We grow orchids for their beautiful flowers, not because they are neat and tidy.

A little hot pepper sauce will keep the cat away.
Repot every 2 years.

Thank you! I really appreciate the advice I find here. My only other orchid is a mini phal that I've had a few years so I'm not used to seeing so many roots. I have a large ceramic pot with holes that I wanted to put the plastic pot into but with all those roots I can't. And I'm afraid of breaking them when I repot. Hot sauce on the roots won't harm them?

Why hot sauce?
If you want to use something in the event of root damage during repotting for example, plain old cinnamon is great!

KathyBack said:

Hi Kathy I'm wondering why All of the aerial roots are pointing in one direction? Does it sit next to a water source (like a sink)?

BigBill you suggested hot sauce to keep my cat from chewing on the orchid.
BBQNBLUES yes, it's usually on a window sill over my kitchen sink, facing north. The roots can only go outward or they would hit the window.
Also many seem to strangle themselves after squeezing through the pot slits. I trim the dead ones off at the pot edge.

Oh my, I did, didn't I? Darn senior moment.

My cats generally don't bother my orchids but my boy Jack started to nibble on a leaf of an Oncidium and I tried hot sauce. He did not care for that one bit!

Ha! We all have them (senior moments). My kitty only chews on the orchid for attention when she wants her treats. I had objects surrounding it to keep her away but that didn't work. I keep it away from the edge of the kitchen island hoping she won't knock it over onto the floor. Since I can't get it into a heavy outer pot it tips easily.