I do not know how big the flower bed is but I have good luck with pepper , keeping the raccoons out of my planted pots. I am a release sight for rehab animals and have moms with babies every spring getting into all kinds of stuff.
I buy the large cheep stuff at the dollar store 99cents , does not matter red or black , the pepper bothers their sensitive noses and they leave things alone , It normally only takes a couple days to a week of pepper
Needs to be reapplied after a rain
I have no idea if it works on armadillos , don't have them here , but it also works on squirrels
