proteas in pots
I just bought a couple of plants I've been drooling over for a long time: a Protea cynaroides and a Leucospermum "gold top". Both are in 6-inch plastic pots, in a mix of primarily sand, with some perlite and bark. The Leucospermum is about a foot and a half tall, looks like an established cutting, while the king protea looks like it was grown from a seed, and is about 8 inches tall. Due to the limited space in my garden, I'd like to transplant them to large clay pots, and maintain them in such pots for life. I suppose I'll need to approximate the mix that they're in now (i.e., sand-based, fast-draining). I understand they like minimal root disturbance. Climatically, I think they should be OK here: I've seen frost twice in 7 years, and 90 degrees F about as often.
Can I grow these plants in containers? Any suggestions?