Buckles

I am a complete newbie and have been searchig countless sites for some information on growing the gran nain.

Can anyone tell me if it is best to plant a new plant in a small pot and transplant as needed or if I could plant in a large planter and it will grow into it's home over time (I know with some plants the roots could take over the pot and hinder the growth if you do that). Also, if you recommend the latter, how large a planter would you recommend?

I live in CT and will be keeping it outside for the warmer months then storing inside for the winter.

Any help would be greatly appreciated. I really want my little guy to thrive.