I love this plant (and anything licorice). Here it is known as Texas Tarragon because Tarragon will not grow in this heat/humidity.
I've always started it from seed and it acted as an annual but this year I purchased a couple of well rooted plants from a flea market vendor. He had them labeled as Aniz. They had woody stalks and must have been divisions from a large plant. It seems like a different variety than what I started from seed.
It has grown all summer and is only now beginning to bloom. Even the blooms appear more delicate than the seeded plants and doesn't bloom as early as they did either. I will leave the seeds/foliage through winter and provide some mulch for root protection.
I trim the foliage periodically and dry the leaves for tea and cooking. I feel more than comfortable that this Aniz will behave as a perennial but wouldn't have thought the same of those plants started from seed.
And, like Sherri, I am curious which part of your categorized herbal garden you planted this in ~ Deb?