hello all you passionvine lovers......

i have 9 different types of passionvines in my lovely garden.the question is my purple ones my red one and my maroon one are all blooming,but the others are not?i cant figure it out...regardless the rest are all fairly new they were all blooming when i got them and now they are all like dormant!growing like crazy just how they do but no flowers.does anybody know how to "force"blooms on passionvines?and another thing all my passionvines are growing on each other.is it a bad thing to have them growing like that?i plan to add many more havent had a problen yet.i have three purple ,1 maroon ,1 red ,1 green and white ,1 blue and white,1 white and 1 purple and white.i know all the latin names but just didnt want to type them all.i know they are supposed to bloom in summer but my purples and red are blooming more now than ever...

ANY INFO ANYBODY COULD GIVE ME WOULD BE GREATLY APPRECIATED...id love to share info with you as well i know quite a bit