Passionfruits are fun to grow, but you sure need a lot of the little ones to get a useable amount of fruit! This is 'Purple Possum' that has loads of fruit on it now, but I collect up about 50 ripe fruits before juicing them, and get about 2 cups of juice.
Passi Coccinea going wild on the back fence, and all over the ground. Last year it was 50ft. up in the big live oak tree!
And this one is P. 'Lady Margaret' who, trust me, is no lady! Suckers all over the place. The flower is really more burgundy than this picture shows.