Answer: There are all sorts of plants to try. Here are a few. (You might consider creating a mix of plants of varying heights and textures--much more interesting than a bed full of just marigolds!) These are all annual flowers. Any chance you could plant some perennials, perhaps this fall? You could then accent the perennials each spring with some lively annuals--but not have to replant the entire beds each spring. (Submit another question via the web site if you'd like suggestions for perennials.)
Snapdragons, calendula (18"), yellow pansies (all prefer cooler temps and will flower spring and fall, with a rest in between during the hottest weather)
Nasturtium, dwarf sunflowers ('Elf' grows to 16"), zinnia ('Gold Dust Pinwheel' grows to 12", 'Star Gold' grows to 14"), yellow petunias (such as 'Summer Sun Hybrid' or 'Celebrity Yellow'; you may be able to purchase plants locally).
Hope this helps get you started.
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