(Question)
This uninvited vine has appeared in my Kitchener garden and lawn. Can you tell me what it is?
(Answer)
From your photo, it looks like you are dealing with trumpet vine (Campsis radicans). Trumpet vine is a fast growing, aggressive deciduous vine. It can sucker from the roots, root where the vine touches the ground, and comes up from seed pods.
Here is some more information about how it grows and what you can do to try to erradicate it if you so desire: https://www.torontomastergardeners.ca/askagardener/killing-a-trumpet-vine/