I have a Mandela vining plant that I will keep in all winter long after putting it out on the deck this summer. I have a lot of foliage but no flowers, but I had flowers last summer on the deck.
Hardiness Zone: 6a
By Peggy62 from OH
It may not be warm enough yet. What's your weather like there? Also try some fertilizer, like Flowertone, that focuses on flowering.
It has been quite hot 80's and 90's, I thought because I had put some fertilizer on it this spring, that that was the reason I was getting all foliage and no flowers?