There are really so many options is it difficult to know where to begin. I'll provide a few ideas and ask you to submit another question to the Monrovia website with a more specific request for a type of plant such as perennials, shrubs, annual flowers, etc. You can submit as many questions as you like but the more specific the better I can help.
For starters I would consider perennials like Yellow Bells (Tecoma stans), 'Indigo Spires' salvia, fall aster, Salvia greggii, and annual flowers like dwarf zinnias.
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