How are you?
Blooming, I hope!
A bloom is a sort of lonely-hearts ad. A plant pays insects or birds or bats in nectar (which is stuff like runny honey) to introduce its pollen to other blooms.
Sometimes, even more cunningly, blooms lure insects in by dressing up as possible girlfriends. The bee orchid, for instance, looks, yes, rather like a bee.
Sometimes a bloom will smell of something delicious to encourage visitors. Mind you, if you're a beetle this might well be rotting flesh.
Or sometimes a bloom will miss out the middle man and just eat the insect straight off.
Some blooms can be really bad news for people as well as insects. If algae bloom (algae don't have flowers, it just means there are so many of them they colour the water) then that's often a sign of pollution.
Oh, and while I'm here, Bloomsday is not a flower festival, but a celebration in Dublin on June 16th of the life and work of James Joyce. The hero of his book Ulysses was called Leopold Bloom.
Thing To Do Today But Not If You're An Alga - bloom. This word is probably something to do with the Old Norse word blōm, which means flower. The Latin word flōs probably has something to do with it too.