This one stays at about 2 feet mounded. Some stay smaller than that, some get way huger. Remember my mini-rose Red Wand is about 8 feet tall, and has been as tall as 12 feet before I cut it back. I suspect most the grocery store ones would stay around 1 - 2 feet tall. But have not bought enough of them to confirm that. Here is a picture of my mini rose - red wand.
Alan
