Deron Caplan
Feb 14, 2022
Beyond the strain: Chasing a cultivated high
Maximizing THC: It Starts with Genetics
The THC potential of a cannabis plant is largely predetermined by its cultivar (strain). No amount of skillful growing can overcome genetic limits, so forming relationships with trusted breeders and trialling new genetics is essential for cultivators aiming to push THC thresholds.
“Cultivar sets the ceiling—horticulture determines how close you get.”
Healthy Plants, Strategic Stress
A robust crop is foundational to achieving high cannabinoid levels. Healthy plants generate more carbohydrates that fuel the production of THC and other secondary metabolites. Yet research suggests that controlled stress, like drought during flowering, may also increase THC content—though this approach walks a fine line and is still under investigation.
Key Barriers to THC Maximization
Inconsistent environment: Poor humidity and temperature control can hinder nutrient uptake and promote disease.
Overwatering: Frequent irrigation suffocates roots and encourages pathogens. Letting media dry between irrigations is critical.
Harvest timing: THC peaks at different points depending on cultivar—often between days 40–70 of flowering indoors. Lab testing throughout flowering helps pinpoint optimal harvest.
Nutrient issues: Monitor pH, fertilizer ratios, and leaf tissue to avoid imbalances.
Testing variability: THC results can differ depending on which bud is sampled and the lab used. Choose labs carefully and sample representatively.
Rethinking the THC Arms Race
Today’s market chases high THC, with modern cultivars often topping 20%—a dramatic leap from <2% levels in the 1960s–1980s. But THC is just one piece of the puzzle.
Trichome limits: The plant only produces so much resin—more THC may mean less of other compounds like terpenes or minor cannabinoids.
Subjective potency: A 2020 University of Colorado study found no correlation between THC percentage and perceived intoxication in flower products.
Evolving preferences: As consumers become more discerning, demand may shift toward unique flavor profiles, minor cannabinoids, and rich terpene content—not just high THC.
A Broader Vision for Cannabis Quality
Fixating on THC alone could stifle product diversity. With time, distinctive cultivars and broader chemical profiles may matter more to consumers than a 1% difference in THC. That shift would let cultivators prioritize flavor, aroma, and experience—not just lab numbers.