I was reading through some of the questions on fruit trees, because I've been thinking about getting some blueberry bushes and cherry trees, and I see a lot of people mentioning that the trees don't self-pollinate, and that you need a male and a female tree to get fruit.
I thought that flowers had both male and female parts, and that the pollination was just from bees transferring pollen to other parts of the flowers. But to me, that sounds like there are trees that have flowers with only female parts, and trees with flowers that have only male parts. And then trees that self-pollinate that have both flowers.
If there are trees that are only male or female, then how do you tell what sex of tree you have? Do you have to look at the flowers to know?