I have some plants that have many flowers but not very many vegetables being produced; sometimes it seems as if I'm growing the plants for the pretty flowers and not for the vegetables that may eventually appear. The flowers look healthy, though sometimes it appears that they open up in the morning, look beautiful until about 2:00, then slowly die by the end of the evening.
I suspect lack of pollination is an issue. What types of things can I do to encourage pollination to occur? Is it possible that there are simply not enough bees/other pollinators in the area?
EDIT: In this particular case I'm referring to cucumber and zucchini plants, but I'd like to see if I can get information that will be helpful when I plant other types of flowering plants, like chilies, strawberries, or tomatoes.