@Weedwhacker - so they're no different than perennials except they're "temporary"? Everything else is exactly the same? Choosing the plants, finding the right spot for them - everything?
Why did I think they'd be any different, I wonder? For some reason, in my head, "annual" = danger of invasion.
long irrelevant story warning -
The only annuals I am aware of either my mother or my grandmother ever planting were my mother's petunias. My grandmother called them "fire", as in "you're playing with fire" or "Got that fire started yet?" but we had them, en masse, every single year that I can remember - because they were the exact same color as her Iris (light purple), mom just loved them.
That's so strange because I never bothered to even look at annuals, aside from container plants, or to check to see if what I believed was true. That's just the way it was. I always thought my mom was so brave because she risked this huge, dreaded petunia invasion

. OMG! That's just crazy!
Cool! So I have this whole OTHER, MASSIVE group of plants available!! Aside from hydrangeas and the occasional surprise bloom that pops up spontaneously, when everything's just right, on a plant or shrub that doesn't flower, I've focused almost entirely on greenery. Greenery and hydrangeas.
I think I may have associated flowers, in general, with invasiveness, as well. Mom's iris would spread so much that there were seasons when it seemed she did nothing but dig and find homes for her overabundance of Iris. When I first moved in here, the narrow bed that extended out from the round bed where I put the boxwood and along the front of the porch was full of tulips which I love in a vase but don't like as a planting. I've been digging up tulips every year. Including the drought years. This year they were in the round bed with the boxwood. Last year I had one lone tulip right smack in the middle of the front yard. I wouldn't have ever known it was there it but mowing started early last year and the kid who did the first mowing saw it and mowed around it, LOL!
OK - so - annuals are not dangerous or evil and no special care need be taken and they don't need to be contained. Nothing special...good to know. Thanks
@Weedwhacker!!