Set the pot in the ground about half way. It will help cool the roots.

And remember these vines get huge so make sure you want to deal with cutting it back year after year. And watch for it spreading underground. Many vines do.

Many passion vines come from tropical climates and handle heat and humidity fine, but not frost. But P. membranacea comes from high altitude cloud forest regions of Mexico and central america where temperatures stay mild, nights are cool but there is never frost.

I'm not sure about the need to baby yours in a larger pot for a year. One nursery near me that sells this vine recommends that so since friends grew it I wanted to be careful. It was going great guns out in the front border and had an impressively bigger root ball when I dug it up. But even it probably wouldn't have bloomed very well out there even if it survived because of light and heat out there in the afternoon. But that isn't a problem for most passion vines, just the cloud forest ones.

@freeofgod Thanks. I have very little sun in the back yard. Otherwise the chainlink perimeter fence would be suitable. My front yard, half the size, and it gets strong sun but only from sunrise to early or mid-afternoon, depending on where in front. Already pretty full of raised beds, that vine might overwhelm any of them. So I think I will plant it at the base of the thick crape myrtle and let it battle it out with the Peggy Martin spring blooming rambling rose already there. That tree was huge(30ft). It cast too much shade and barely bloomed, so I chopped it back to a 7 ft tall four trunk vase shaped stump. It promptly sprouted like a chia pet on steroids, so it is a more manageable garden tree of around 15ft tall and doesn't cast too much shade. I have to prune it every winter to keep it in bounds, so the passion vine would seem a suitable matchup.
Btw, I know, I am a crape murderer, but I make no apologies. I was afraid I'd be incapable of clearing out the entire root system, so this is my compromise. I think the tree could provide great part shade conditions for the passion vine.

I planted my first passion vine in August the year I got it. It established well enough that 15 years later it is still going strong. I'm not in ideal conditions, but I still get some fruit and give away sprouts every year. I have two cultivars

@glennlab looks good! I feel like I should find a second cultivar to acheive some fruit.

@MikeInBatonRouge Happy to send you some sprouts if you want them, I have the blue which fruits most years even here in Dallas and the purple that should fruit where you are.

@glennlab if it is easy to ship, that would be lovely. Not sure how exchange of address info is handled on this site.

@MikeInBatonRouge just send me your address in messenger. We used to do it all the time in the seed exchange group before it folded into this one.

@OwlInASack The biggist problem is customs and quarrentine requirements. Even within the US there are certain plaants that you can't ship into/out of other states.

Maybe there is a 6 photo limit? Here you go. The fig tree I'm giving it for a trellis is visible at the top of the fence.

Yeah the foliage and flower bracts when backlit just glow. I like the flowers too but their bracks and the leaves steal the show for me.