I keep mine in pots. When they get too huge to be in the pot I can handle, I roust it out and start a new one from a cutting. Charles Grimaldi is sort of a wimpy one, and I'd like to try another yellow one instead.
Forgot to add, love those Passi's too. I have that one, quadrangularis, right? Have you ever had one set a fruit? I'm thinking we don't have the right pollenator here. I get lots of flowers, but never any fruit.