Most hardwoods produce dramatic leaf coloration if climatic conditions are favorable. Chlorophyll allows the green pigment to be the most prominent of the pigments, however the green pigment is also the least stable. As autumn approaches, chlorophyll is destroyed faster than it is produced. As the chlorophyll disappears, the carotinoid pigments begin to show. The purple and brilliant red shades become visible from production of anthocyanin pigments which are also capable of masking the carotinoids.
Tannins cause brown shades in some species.
They include adequate summer rainfall, adequate sugar accumulations in the leaves, and prolonged periods of cool, bright, sunny weather without severe frosts. Frost is not an essential element for leaf coloration. Back to index. Due to their conscientious work, the overwhelming majority of the trees appear to have been well established and healthy. The watering volunteers were particularly thankful for this tangible recognition of the importance of their work.