The little ones weren't pollinated.

Thanks Jean. That is interesting and may be this is where I should think about adding some plants that attract butterflies/bees? Is there anything else that can be done to increase pollination?

I see few bees and some lady bugs on these trees but not a lot though. Appreciate the feedback.

You asked "Is there anything else that can be done to increase pollination?"

Yes, you can be the bee by using a small child's paintbrush to spread pollen from open male blossom to open female blossom.

Also need appropriate temps for the plant at hand, neither too high nor too low.

I will learn how to do that. Thanks for the reply.

I have 5 ridge gourd vines, with profuse leaves and male buds on the axil that never seems to grow, these male flowers just turn yellow in a few weeks and fall off. I see a steady stream of ants marching up and down the vine? What's the problem? Any expertise would be deeply appreciated!

do you see any female flowers which have different stamen and usually a small fruit behind the flower. If so take a male and rub it over the female. My gourds have set fruit.

Penny

What happen thr small ridge flower turn yellow before the flower open up?