Answer: It's not too late to plant lilies or irises! You can plant them right now! You can plant annuals in among them to provide color all summer long. Use plants that will provide contrasts in leaf shape as well as height to the sword-like leaves of the iris...petunias, marigolds, etc. If you want perennials to fill in the spaces then maybe some summer blooming plants like chrysanthemum X maximum (shasta daisy) or fall blooming like Sedum 'Autumn Joy'.
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