Flowers to plant in a window box that faces south
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Con12356546
flowers to plant in window boxes facing south, and also around the mail box
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You don't say what part of the country you live in. When you go to your local greenhouse to purchase flowers talk to one of the people there....since their in your area they should be able to guide you in the right direction. Here's a great article from "The Spruce" that should help you with great suggestions.....
https://www.thespruce.com/full-sun-plants-2132604
Petunias, geraniums, ivy geraniums, zinnias, carnations, bachelor's buttons, sweet alyssum and blue blazer among many, many other flowers would do very well in a southern exposure as long as they are kept well watered.