Experts and BHG readers answer.
Making an urn a focal point in a southern garden
There a lots of choices of annuals that could work in this situation. Because your house includes gray and navy blue, either pinks or blues would complement it. Some drought-resistant annual plants to consider are: gomphrena, moss rose, statice, scaevola, vinca, salvia, lantana, geranium, and dusty miller.