Q.What is the best fast climbing plant that has to always be in a pot.
We live in a climate that is hot in summer but cold and icy in winter.
Certified GKH Gardening Expert
That's a fairly general question. Do you want a climbing rose or a vine, like a morning glory? Clematis works well, and so does ivy. A lot depends on where you want it to go, how big you want it to get and what type of plant you're looking for.
Here's an article about a plant that is not only a beautiful vine, but produces gorgeous flowers: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm
https://www.gardeningknowhow.com/ornamental/vines/ovgen/growing-perennial-vines.htm
https://www.gardeningknowhow.com/ornamental/vines/ovgen/growing-annual-climbing-vines.htm
https://www.gardeningknowhow.com/ornamental/flowers/roses/rambler-climbing-roses.htm