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Why do some red maple trees have yellow fall foliage instead of brilliant red? Although fall color will vary with different environmental conditions, in many cases the yellow foliage of these red maples is simply due to the genetics of the individual tree. Unnamed red maple trees grown from seed are not always brilliant red. They have highly variable fall color. If you want a red maple with red foliage in the fall, choose named, vegetatively propagated red maple cultivars such as Red Sunset, Magnificent Magenta or Autumn Flame. October Glory has outstanding foliage color but is late in acclimating for winter and can be damaged by early cold snaps. However, even these "good" cultivars will vary in the level of "redness" from year to year. A number of things can reduce the intensity of color including extreme heat or drought during the summer and cloudy days and warm nights in the fall.
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