Cation Exchange Capacity

Cation Exchange Capacity (CEC) is a soil chemistry measure—not an aroma—but appears in cannabis cultivation literature as a factor influencing nutrient availability and plant expression. CEC refers to soil's ability to hold and exchange positively charged ions (potassium, calcium, magnesium, ammonium) that plants uptake. Higher CEC soils retain nutrients longer, potentially affecting cannabinoid and terpene profile development by stabilizing nutrient access during flowering. Breeders and cultivators working with specific phenotypes often correlate substrate CEC with consistency in aromatic expression across generations.

Breeders documenting phenotypic stability may reference CEC as a cultivation variable affecting terpene consistency across runs. Understanding substrate chemistry helps isolate genetic expression from environmental variables when selecting for desired aroma profiles.