I think this is Alocasia odora. There are a number of very similar forms. This survives a slight frost, however a clear night in midwinter will cause a hard radiation frost which will damage the leaves. A sheet of newspaper or fleece over the top will protect it. Last year I froze its leaves on one occasion, and it looked rather droopy for a month, but ultimately it recovered.
I bought in a 10cm pot as a house plant from a local garden centre.
Because I am a little uncertain of the identification of my large plant, I bought this little one to compare it with (when it gets large enough!)
This is a young plant out of tissue culture.
It has grown steadily through the year, confirming my opinion that this is the toughest species I grow.
It survives well through the winter, which gives it plenty of time to grow magnificently through the summer.
The appearance of flowers this year has confirmed that the plant is prospering - though that was fairly evident anyway!
The main trunk was set back by the cold winter, though it has started to grow away now. I need to keep it warmer and growing in the winter.