Is this graft failing?

[engeizuki]

I grafted this echinocereus onto pereskiopsis about 4 months ago. It has been growing well, though a little slower than some of my other grafts. But now the scion has started growing a root. Is that a sign that the graft is failing? Should I degraft it and let it grow on its own roots, or is it fine to leave it on the rootstock?

[snarfie]

If it's growing the graft probably took. Sometimes they just do weird things. But when it's growing roots it will probably be easy to degraft.

[jmoney]

If it has its own roots, it will probably be alright to degraft and be well off on its own. It doesn't sound like a problem to leave it grafted though as long as it is growing on the stock.