I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
Add 1-2" of compost to improve the soil and mix it in well. Or just use potting soil in the planter boxes. Some flowers for that amount of sun include dwarf zinnias, marigolds, purslane, blackfoot daisy, fanflower, and narrow leaved zinnia.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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