What do you mean do they grow much as adults?

Retics grow big, and fast. There are different types of dwarf retics that reach different sizes.

Jampea dwarfs are the larger dwarf subspecies.. they can reach 12-15' at maximum.

Super dwarfs are much smaller. They can breed when they are around the same size or smaller than a ball python! Size on them is 6-8' I believe.