Do you know which variety you got? aristolochia tomentosa (edited from durior) or aristolochia macrophylla?

I have both and from what I remember... both took 4-5 years to start blooming decently. The durior one is covered in blooms now after 8 years.

Be aware that the tomentosa type does start to send runners out a few feet in all directions from the main plant. It acted fine for 7ish years... but now it's kinda becoming an issue. I planon taking cuttings from the macrophlla and eventually replace the Tomentosa.

Could also be A. tomentosa (aka Isotrema tomentosum). I don't know if that would make any difference in the flowering behavior though.

Durior and macrophylla are the same species. (???) I have a wooly pipevine, Isotrema tomentosum that suckers.

Thanks everyone. I believe both of my vines are Durior. Is it possible that it needs fertilizer to make "pipes"? One I had growing up over my fencing-enclosed chicken run. It went crazy and eventually we had to trim it way back because it was causing too much weight on the top of the run. But a couple months ago, I saw that it took off in the weeds behind the run and covers about a 10x16' area. We will probably mow that area in the Fall, but I saw some pipevine swallowtails flying around that area and I wanted them to do what they needed to do, so left it that way. Who knows......maybe I'll just let it live there. The only down side is our 35 acres are fast becoming overrun with all sorts of invasive vines. Wouldn't want to add one more to the list.

It sounds like your vine is starving for phosphorus. My friend in Florida had the same problem when I visited there. His Bougainvilla grew healthy but the flowers had waned away. Most fertilizers are low number like 3 8 3 and such. Try to find something like 16 24 8. It solved the problem for my friend. Good luck with it.

I have my durior growing up our arbor to cover the deck... it's quite the site from underneath. If yours is only a couple years old though... it still might just be settling in still. 4-5 years for mine to take off with blooms.

You can try the phosphorous... but it might just be a waste if they are too young still.

Thanks harold and Nevermore. These 2 are 15 and 20 years old. I think the phosphorus is a good suggestion. I guess I wasn't thinking of the "pipes" as blossoms/flowers. If my tomatoes never blossomed, I would definitely have thought of phosphorus! But for some reason, I never thought of it. DUH! I'll give that a try. Thanks!

My bad. I was reading your first post has they were just 2 years old. ... not that they hadn’t bloomed in 2 years.