Is that nursery pot rigid? If not you'll have to stuff something in it to keep it from collapsing from the weight of the cement mix.
To use dry wall tape you put a layer of the mix on the nursery pot then the dry wall tape then another layer of cement mix.
If you use the wire, cut it to shape the pot! Cut a circle for the bottom then a length wise piece for the wall. Just crimp (smoosh)the chicken wire to comform to the bottom of the pot before attaching to the bottom. Smooshing will eliminate the gaps. Billie

Why don't you just make the tufa pot on the inside of the nursery pot? It would be easier and you can texture the outside of the pot once it's unmolded.

Just use the wire by itself. no need for the pot.

I will have these same questions, I am sure. club53 asked why don't you make the pot on the INSIDE of the nursery pot? If you do that, you get a smaller pot! Why bother? The outside of the pot becomes the INSIDE of the tufa pot, so the size is right.

That's only one opinion, and it's mine. I would have to purchase HUGE pots to make a 30 gallon pot (for trees)if I used the INSIDE, so I'm paying close attention to the advice in this thread.

Thanks!
Suzi

Actually I ended up making my pot inside the original pot. The end result is going to work just fine and is a huge pot in it's own right. I'm using a cheapo black nursery pot that is about 30 gallon size I believe. The finished tufa pot is not all that much smaller. They are definately big enough for a citrus tree. I've got two done and will be making the last one (of this style) later tonight.

I'm so happy that Club53 made that suggestion. Sometimes the simplest things just escape you when you are trying so hard that you end up over thinking it. It worked great and made the process easier and sooo much quicker.