If I'm going to graft Ario's, what are some recommended stocks that I could use. If I'm going to use grafting method, I may as well get some stocks ready.

Grafting is most definitely the fastest method especially for the ultra slow growers like Ariocarpus, however it becomes difficult when you want to grow and graft a large number of plants. I have spent many hours potting/re-potting stock plants and getting everything ready to graft.

For my last lot of Ariocarpus I put down 200 seeds grafted about 20 and let the remainder grow out, I must say it is very rewarding to grow these guys from seed They are still tiny but coming along nicely.

HN

I recently re-potted about 100 of them I will get a picture and post it up

I've already got some Slenicereus. Does it matter that they aren't mature? I rooted them as cuttings not so long ago.
I looked at photos of Hylocereus and noticed that their leaves look a bit like Epiphyllum,
how would Epi's go as a stock?
Would love to see your ario seedling mate.
Once again, really appreciate everyone's help

I posted a separate thread with the seedlings mate. Epi's are no good, I have see a few experiments but never any success.

Most selenicereus are pretty good especially for younger seedlings.

I find the selenicereus good for some permanent grafts as well.
There is a really good PDF about the selenis, here's the link:

http://www.richtstatt.de/gymnos/docs/wick_graft.pdf

Another thing to remember, is that the Pereskiopsis is often not good for a freestanding graft for more then about 2 years, as the grafted scion becomes too big for the structure of the peres. You can attach the graft to a stake, if you want to keep it on there.

mitchell101
If you use grafting stocks from cuttings, rooting is not critical.
It is better to use rooted stock but you can use a cutting without roots as a grafting stock.
The scion will grow immidiately after a successful grafting process if you used rooted stocks.
On the other hand you have to wait a bit but the scion will start to grow when roots of the stock start growing.
The success ratio of the grafting is not so different using rooted and non-rooted stocks.

IXOXI
Selenicereus is also quite thin.
If you grafted a large type of Ariocarus i.e. retusus and related, you have to consider a support.
Retusus var and cultivar will grow around 20 cm diameter.

Hanazono