Chlorophyll Deficiency

Chlorophyll deficiency in cannabis refers to a genetic or environmental condition where plants exhibit reduced green pigmentation, often appearing yellowed, pale, or variegated. This trait is typically undesirable in commercial cultivation as it compromises photosynthetic efficiency and plant vigor. Chlorophyll deficiency can result from nutrient lockout (particularly nitrogen, magnesium, or iron), viral infection, or recessive genetic mutations. While some breeders have explored variegated cultivars for ornamental interest, most cannabis breeding programs actively select against severe chlorophyll deficiency. Understanding the underlying cause—nutritional, environmental, or genetic—is essential for diagnosing and managing the condition in breeding stock and production crops.

Breeders monitor for chlorophyll deficiency as a negative phenotype indicator when selecting parent plants; persistent deficiency suggests genetic instability or incompatibility. Some specialized cultivators have intentionally bred mildly variegated lines for novelty, though reduced yield potential limits commercial adoption.