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Hi and welcome to JustAnswer, I am Dr.Fix-It your garden expert, Well for a variety of colors Daylilies are good flowers that can not only take the heat, but will grow well in a range of soil conditions. Also, Threadleaf coreopsis is another easy-to-grow, sun-loving flower that is good for edging a path in even the poorest soil. Can click on the underline links to see the range and then go down to your local nursery to see what have available. A bit of shade is ok and should provide a nice splash of color to your yard :) Well happy gardening aye.