[twocol_one]Pros
Pretty.
Don’t need to be mowed???
I think they ward off vampires.
better than cat’s paw
[/twocol_one]
[twocol_one_last]Cons
Yard Nazi neighbor
Technically weeds
Lauren might be a vampire.
may be harbinger of alien conquest
[/twocol_one_last] 
Feel free to add items to either list.
Hey! 🙁 I really am a vampire!
Pro: green Con: Can’t eat them
Sorry to be a smarty-pants, but I love talking about gardening:
You can eat violets. People often sugar-coat the flowers as cake decorations. The leaves can also be tossed into salads.
I’m not a big lawn-care fan, but grass lovers hate violets. To them, violets are horrible, horrible weeds. They spread seeds like CRAZY!
I think the flowers are pretty, but they only bloom once in the spring, then not again.
Pro: You already said it – pretty.
Con: Short-lived flowers.
Short lived flowers may be a pro, depending on your perspective. If you have a Yard Nazi neighbor, then once the flowers die you might be able to pass the plants off as grass. At least from a distance. We do that with all our weeds – our lawn is probably less than 10 blades of actual grass.
I say put short-lived flowers in the pro column as well.
Pro: nice flower!
Con: belongs in the forest (or woods)
PS: I like them anywhere..
Pro: It’s alive & growing!
Con: It’s alive & growing.