Seeds, Germination & Seedlings
Seed structure, dormancy, germination, emergence, early roots, cotyledons, seedling establishment, and propagation fundamentals.
Published lessons
These pages are organized here by subject. The permanent THC-ENC IDs remain stable behind the scenes even when a clearer display title is used.
Seed Development and Maturation on the Mother Plant
Trace the development of a fertilized ovule into a mature cannabis dispersal unit and identify the maternal conditions that can affect seed quality.
Seed Lot Identity, Provenance, and Chain of Custody
Build a traceable seed-lot record that separates supplied names from verified genetic and performance evidence.
Seed Viability Versus Seed Vigor
Distinguish the capacity to produce a normal seedling from the speed, uniformity, and resilience with which a lot establishes.
Seed Moisture, Temperature, Oxygen, and Storage Life
Explain how storage environment and packaging interact with initial seed quality to influence deterioration.
Dormancy and Why Cannabis Seed Responses Vary
Distinguish dormancy from quiescence, nonviability, physical restriction, and poor test conditions.
Imbibition: The First Phase of Germination
Describe water uptake by a dry seed and the difference between hydration, metabolic restart, and completed germination.
Enzyme Activation and Reserve Mobilization
Explain how a germinating cannabis embryo restarts metabolism and converts stored reserves into usable energy and building materials.
Temperature Effects on Germination Rate
Interpret temperature as a rate-limiting and stress factor without converting one experiment into a universal optimum.
Moisture Without Oxygen Deprivation
Manage water availability and pore-space aeration as simultaneous requirements during germination.
Radicle Emergence and Germination Scoring
Use a defined, repeatable endpoint for germination and keep it separate from emergence and establishment.
Root Hairs and Early Nutrient Acquisition
Explain how the young root develops absorptive surface area and why physical root-zone conditions precede aggressive feeding.
Hypocotyl Elongation and Seed-Coat Shedding
Describe emergence mechanics and diagnose common coat-retention and elongation problems without unnecessary handling.
Cotyledon Function and the First True Leaves
Identify the transition from reserve-supported growth to expanding photosynthetic and root uptake capacity.
Seedling Light Acclimation
Increase light exposure based on measured dose and plant response while preventing stretch and abrupt high-light injury.
Seedling Watering and Root-Zone Oxygen
Match irrigation volume and distribution to a small root system while preserving drainage and air-filled pore space.
Seedling Nutrition and Salinity Sensitivity
Support early growth without allowing concentrated soluble salts or pH error to damage a small root system.
Damping-Off Biology and Prevention
Recognize pre- and post-emergence damping-off risk and build prevention around sanitation, drainage, environment, and early removal.
Normal, Weak, and Abnormal Seedling Evaluation
Classify early outcomes using essential structures, development, and trend rather than appearance alone.
Transplant Readiness and Hardening-Off
Decide when a seedling can move systems and acclimate it to changed light, wind, temperature, humidity, and root-zone conditions.
Germination Testing, Metrics, and Failure Analysis
Design a repeatable germination test, calculate decision-useful metrics, and locate failure within the seed-to-seedling sequence.