Visnaga: Annual or Perennial?

I bought some visnaga (Ammi visnaga) seeds from you this year and now have some lovely looking plants. I see that you list the plants as a perennial but on doing some research all the other websites that I found list it as a annual or a biennial. Before I put them out for sale I want to make sure that I have the correct information. Appreciate your feedback and thoughts on this.

Visnaga is either an annual or a biennial. Although some species of Ammi are perennial, most authorities list A. visnaga as either annual or biennial. We will correct the error in our printed and online catalogues. Thank you for bringing this to our attention!