Q.Trumpet vine
After several years it still won’t flower. It’s invading a line of shrubs.

Downtoearthdigs
Answered on July 26, 2017
Trumpet Vine are known to take up to 10 years to start blooming.
There could be other causes so the link below will help you review the care.
https://www.gardeningknowhow.com/ornamental/vines/trumpet-vine/trumpet-vine-no-blooms.htm
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