how cold to kill my plant?

i have a plant growing outdoors and lately its been getting really cold over the night. its been maybe 15-20 degrees at the lowest but im suprised my plant is still alive.

wow.... i was scared with my low 50's, upper 40's. if the roots freeze i heard it kills them

i would get it inside....it will survive a frost or 2, but thats about it

wow thats low, ya if your plants core temp gets that low it will def die(im very surprized yours is alive)

i would do something to change those temps ASAP!

Your talking 15-20 celsius?

Where I grew up it gets colder than that every single night of the year.. As for Fahrenheit, the plant is almost definately past any point of return if thats the case..
What stage growth?

yes that is in Fahrenheit sorry. i just put the plant out there through winter to see if it could survive, and seems to be doing fine. I had it in a small pot to begin with and the growth was stunted. so its not very big, but it is flowing. if i just leave it and let it go back to veg over the summer will it be fine?

Umm, look around your area.. Are any similar types of plants thriving outside right now??