Foliage halloween - Individual leaves, even of the same species, turn color in many different ways. These maple leaves show both a complete change across an entire leaf (top), and partial change (bottom), with blocks of tissues turned brilliant red while adjacent areas still remain green. Or, each leaf may be two or more colors at the same time. The yellow from the carotenoid pigments blends with the red from the anthocyanins. When conditions of temperature, moisture, and the amount and strength of sunlight are all in the right combinations, we will be treated to spectacular fall colorations. The entire trees blaze forth in vivid hues, along city streets as well as across the open countryside.