Monstera

[SeanK]

What are the most cold-hardy Monstera species? How much cold can one take?

[Xenon]

Standard Monstera deliciosa is good to around 28F under canopy/no frost. You're still looking at a melted mess in the mid 20s though unless very short duration. The stems/nodes at/near ground level will make shoot out again provided the ground never freezes. It's a pretty reliable occasional dieback perennial in the warmer half of zone 9. Maybe as a yearly dieback perennial in the warmest parts of zone 8 with extra mulch/intentional siting. It's not something that wants to be frozen to the ground every year. It's a step up in tenderness from something like Philodendron bipinnatifidum (selloum). 

Here's a pic from warmer days in Houston's heat island @RedRabbit

 

[metalfan]

Yeah they melt below about 28. They will come back most of the time, but then you have to get it big again.