What plants are best for planter boxes on a balcony that receives strong morning sun until about 10:30 a. m. and then reflected heat from a nearby wall? This is a dry hot climate. In the past there has been good success with geraniums and petunias. Lots of color is the goal.
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These articles can help with some suggestions: https://www.gardeningknowhow.com/ornamental/flowers/fgen/full-sun-plants.htm