Your healthy, well-watered Raywood ash coloring later than neighbors is normal genetic and cultural variation—not a problem. Fall color timing differs by individual tree.
Tree is vigorous (15' in one season). Color will develop as temperatures drop. Forcing early color with drought stress harms long-term health. Enjoy the extended green phase—purple-red will come.
As tree matures, color timing stabilizes. Your landscaper's assessment is correct: health delays color. This is a sign of success, not failure.
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