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Seed & Germination
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Explore
THC Living Plant Atlas
Explore the plant as one connected biological system. Select a structure, switch lenses, then open the system lessons when you are ready to go deeper.
10 plant systems60 structured lessons16 observation fields
Whole-plant anatomyHotspots show your saved learning state
Whole-plant learning map
See what you know across the plant.
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Root System
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Stem & Vascular System
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Nodes & Branching
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Leaves
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Flowers
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Trichomes & Resin
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Sex, Pollen & Seeds
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Environment Overlay
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Diagnostic Overlay
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Lifecycle lens
Watch the plant change across development
Stage 3 of 6Vegetative Growth
fan leavesnodesinternodesaxillary branchesexpanded root system
Overlay → lesson bridge
Turn a measurement or symptom location into the next useful lesson.
The overlay is a navigation layer, not a diagnosis. Follow the variable or location into plant physiology, then combine it with stage, history, and additional measurements.
EnvironmentOpen full environment system
Light / PPFDcanopyleaf_temperature · transpirationLeaf temperaturecanopyvpd · stomataAir temperatureairrh · vpdRelative humidityairvpd · transpirationVPDairstomata · water_uptakeAirflowairleaf_temperature · transpirationCO₂airphotosynthesis · stomataRoot-zone waterrootsroot_oxygen · water_uptakeRoot oxygenrootsroot_health · nutrient_uptakepHrootsnutrient_availability · root_healthECrootsosmotic_stress · nutrient_supply
Diagnostic locationOpen diagnostic system
Newest growthtopIs new growth pale, distorted, twisted, or stalled?Upper canopyupperIs damage strongest nearest the light source?Middle canopymiddleIs the pattern spreading upward or downward?Older / lower leaveslowerDid symptoms begin on the oldest leaves?One branch / sectorbranchIs the rest of the plant normal?Whole plantwholeWas onset sudden or gradual?Root zonerootsWhat is substrate moisture now and over the last cycle?
Whole-plant curriculum
Explore every plant system
Distinguish the achene fruit wall from the true seed and embryo tissuesFollow imbibition through radicle emergenceRecognize healthy cotyledon transitionSeparate seed viability questions from environmental failure patterns
Lesson 1Open lesson
Seed anatomy
Distinguish the whole cannabis achene from the true seed and locate the pericarp, seed coat, residual peripheral endosperm, cotyledons, radicle, hypocotyl region, and plumule.
Lesson 2Open lesson
Imbibition
See how water uptake rehydrates seed tissues and restarts metabolic activity before visible germination.
Lesson 3Open lesson
Radicle emergence
Follow the radicle as the first root organ emerges and establishes the direction of early seedling growth.
Lesson 4Open lesson
Cotyledon transition
Track emergence from the seed shell through cotyledon opening and the first true leaves.
Lesson 5Open lesson
Germination failure patterns
Compare stalled seeds, damping-off risk, shell retention, excessive moisture, and temperature-related delays without assuming one cause from appearance alone.
Lesson 6Open lesson
Reserve mobilization
Follow stored lipids, proteins, and other seed reserves as germination restarts metabolism and supports embryo growth before expanding leaves become the dominant current carbon source.