Rooftop trumpet vines?

Dear Expert (Carrie, Bob or Susan)
We have a client who’s property is situated on the 16th floor with a rooftop garden in downtown Seattle. The terraced garden faces south and southeast. The 4 trumpet vines are each in their own containers that are 24″ square x 26″ deep along with Algerian Ivy, trailing Rosemary. They get full sun and some wind, but are up against a wall. The foliage growth appears normal and they’re working their way up the metal trellis support. They have not bloomed yet, nor do they seem to be developing any buds. They bloomed last year (their 1st year in that spot) just coming out of a #5 nursery pot. So I can’t imagine that it’s because they’re growing in containers now. The pruning I did this spring was very light so I can’t see how that may be to blame. I also fertilized them in spring with an organic 9-3-4 all purpose fertilizer. I can’t figure out why they haven’t bloomed and hope you can.

Dear Cheryl,

Thank you for your question on trumpet vines, (Capsis radicans).

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