Anyone know the name of this flowering weed?

Does anyone know the name of this flowering weed? It started growing out of our balcony satoyama box, and suddenly it reached two meters tall, intertwining itself with the morning glory on the green curtain. At first I wasn’t sure if it was an intentional plant, and then it started blooming. The flowers almost look like jasmine.

During the time I was documenting it and before I could post about it, I recently visited the University of Tokyo Botanic Garden (also called Koishikawa Botanic Garden). It’s a lovely garden, which I will post about soon, that traces back to 1684. Although full of history and botanic treasures, this Botanic Garden is also a bit overgrown with vines choking out the azaleas.

I am curious if anyone knows the name. I am guess it is very invasive. Do you think it is a satoyama plant or a kudzu-like danger?

3 comments

  1. Thanks, Joan. The stem is certainly strong, and it’s a fast grower. Towards the base of the vine, the stem has turned brown, the rest still green.

  2. It’s possibly Clematis terniflora, the Japanese native autumn clematis. It’s popular in the Northeast US and makes lavish displays of fruit as well as fragrant flowers.

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