I grow Sweet Annie and once you have it then you've got it pretty much forever...lol. I like this since I don't have to replant. It does smell incredibly wonderful. Can be used just hangind upside down, as swags, perhaps tied with raffia, You can make wreaths with it, or add it to other herbal wreaths. Mine will normally grow to about 6 ft tall with the trunk becoming quite sturdy. I've noticed that it's coming up this year in spots that won't get a lot of water so it will probably stay small in those areas.
This is what it looks like in an area that's gotten no water since our last rain several months ago. It's 'feathery'. The stems that you cut to hang and dry will stay feathery, but the stalk will get to be about 1-1 1/2 inches in diameter and the 'branching' will be tree-like.