The size of the plant will differ, depending on the variety. The tallest I've heard of reaches 3'.
How large is the pot it's in now? I think you could transplant it into a larger pot, but you don't want one too
big. For a 3' tall plant, I would probably choose a clay or ceramic container 8 or 10 inches in diameter. Clay and ceramic containers are significantly heavier than plastic. Be sure to choose one with drainage holes. I would try to find one with a broad base, such as the type sold as azalea pots and bulb pans. It will look similar to this:
If you feel you need to add even more
weight to the container, you can put about 2" of gravel in the bottom, before filling it with soil, although I no longer do that. A clay or ceramic container with a broad base is usually sufficient, unless your plant is exposed to winds.
I like to put a piece of non-metal screening, such as is used for window screens, in the bottom of the pot. I just cut it to fit. It helps keep soil from washing out the drainage holes and prevents insects from entering through the drainage holes.
Be sure to use a potting
mix, not soil from the yard or garden. Potting mixes are designed to have the excellent drainage container-grown plants require.
And a very warm welcome to the forum! We're glad you're here!
"Isn't it enough to see that a garden is beautiful without having to believe that there are fairies at the bottom of it too?" - Douglas Adams