Each plant species can have a lot of cultivars, varieties, chemotypes, and accessions. A cultivar or variety difference in a plant refers to members of the same plant species that may differ in minor but heritable characteristics. For a specific plant cultivar, the internal quality is influenced by genetic differences and the surrounding environment. Cultivar variation affects the cellular structure, moisture content, sugar content, firmness, and the degree of stress resistance.

Biosynthesis of bioactive phytochemicals in plant tissues is highly ordered and effective by harvesting times, including different developmental stages and seasonal changes. Both were complex factors in environmental variables that significantly regulate many physiological and behavioral processes, such as shifts in chemical and microbial rhizosphere community composition. Substantial differences in biological activities may also occur.