In a hot place like Dallas, rocks will heat up the soil. This isn't good for either plant. Elephant ears need constant moisture and perhaps afternoon shade in Texas. Roses like full sun as long as they are watered adequately, 1-2 inches/week. However, to keep the roots cool, use a wood or other organic (plant-based) mulch 2-4 inches deep. If you can detail what isn't going well or post a picture, we'd be glad to offer more help.
Answered on May 30, 2019
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