What is this new vine with cordate leaves growing along my fence? It sprouted up this year in early August and I didn't do anything to it at first bec...
New vine undergoing rapid growth #851167
Asked September 25, 2023, 1:00 PM EDT
What is this new vine with cordate leaves growing along my fence? It sprouted up this year in early August and I didn't do anything to it at first because I thought I might have planted it. It only spreads by wrapping around objects and does not have the pieces that adhere to surfaces.
Baltimore City CountyMaryland
Plant ID is difficult without blooms to assess, and in this case, several look-alike vine species have heart-shaped leaves like this. Might a neighbor on the other side of the fence be growing Pipevine? Although its native range in Maryland is only in our far western counties, it has become popular in butterfly gardens (as a host plant for Pipevine Swallowtails) or for use as a deer-resistant vine to cover a support for aesthetic reasons, so could readily appear in other parts of the state. Like many other vines, it can sucker and might emerge from root sprouts several feet (or several yards) from the parent plant. One reason we suspect these are suckers from an existing vine instead of from a seedling is the fact that it only appeared in your garden late in the growing season and presumably grew pretty fast instead of beginning with seed leaves that a newly-germinated plant would typically have.
If you rub/scratch/crush the leaves, do they have a pungent odor? Pipevine usually has a prominent smell when bruised.
The leaf veining doesn't appear to be as good of a match, but Anglefruit Milkvine and Honeyvine also has heart-shaped foliage. However, these species has oppositely-arranged foliage while Pipevine has alternately-arranged foliage.
I checked over the fence and the only sprouts are coming from my yard. I did double check through my seed packets and it looks like I planted a heirloom mix of mailbox morning glorys so I think that might be what it is, I believe I planted them sometime in june and they only really exploded late august. I scratched it and there was no odor as well.
Our apologies for the very slow reply...a system glitch in Ask Extension caused us to receive client replies quite late. Morning Glory could be a possibility since that was in the packets used, so perhaps that's the correct ID. If the plant resprouts from the same root system next year, that may suggest it's a Pipevine or another species, since Morning Glory is not winter-hardy here except to germinate from seed the following year. (If this plant didn't flower at all in order to set seed, though, then it might not come back at all.)
This work is supported in part by New Technologies for Ag Extension grant no. 2020-41595-30123 from the USDA National Institute of Food and Agriculture. Any opinions, findings, conclusions, or recommendations expressed in this publication are those of the author(s) and do not necessarily reflect the view of the U.S. Department of Agriculture.