Senescence
/seh-NESS-unss/🔬 Anatomy●● Intermediate
Also known as: aging, plant aging
The genetically programmed process of aging and deterioration in plants, visible in leaf colour change and fall, flower fading, fruit ripening, and whole-plant decline. Leaf senescence involves chlorophyll breakdown (revealing yellow and orange pigments), nutrient reabsorption, and eventual abscission. Senescence is triggered by environmental cues (shortening days, temperature) and hormonal signals. Understanding senescence helps gardeners time harvests and manage plant lifecycles.
Etymology
Latin senescere (to grow old), from senex (old)
Example
“The brilliant autumn colours of maples are a visible sign of leaf senescence — chlorophyll breaks down, revealing carotenoid pigments.”