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An enzyme in the nectar of acacia trees makes ants chemically dependent on their sugar. Photograph by Alexander L.Wild. Trees Trap Ants Into Sweet Servitude.

None of the seven acacia trees in the front yard of Sam Morse's home in La Feria, Texas, seem different from any of the others—or from their countless cousins that thrive in the Lower Rio ...

A moderate-to-fast-growing small evergreen (evergray?) tree, the purple-leaf acacia reaches 20 to 30 feet tall and wide. Its dense, spreading canopy is easily shaped as a single- or multi-trunk tree.