Answer: This type of location is very difficult to plant because the afternoon sun is very hot, reflects off of the building and stresses the plants tremendously. Larger boxes so that the roots have ample room would increase your chances of success, using a water holding polymer in the soil might also help. Some plants to try might include the vinca rosea or annual vinca, annual salvia, dwarf dahlias, the small Starbright zinnias, or possibly a small variety of dianthus. Alternatively, the newer imitation flowers are more lifelike and can appear "real" from that distance.
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