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Many of the outdoor plantings at the Zoo don't really take off until around this time of year. Here are a few pictures I took yesterday.
Some sort of Pennesetum, possibly 'Little Bunny'.
Large Castor Bean plants outside the front gate, along with large Sunflowers, large Cannas, and really nice "annual" Fountain Grass.
Probably Asclepias curassavica?
Natural wooded area near an unnatural waterfall near the Mayan Temple display.
Some sort of Miscanthus, even more of these will start to really put on a show as we get later into September.