Cannabis sativa hemp leaf age, crown position, photosynthetic capacity, quantum yield, light saturation, respiration, electron transport, and the decline of photosynthetic performance after full leaf expansion in the studied cultivar and conditions.
Visual lesson 09
Leaf age & photosynthetic capacity
Compare newly expanded and progressively older Cannabis/hemp leaves to understand why photosynthetic capacity, light saturation, and related gas-exchange traits can decline with leaf age even while a leaf remains visibly green.
System study map
Leaf age & photosynthetic capacity
Leaf-age photosynthetic-capacity timeline and canopy mapStart with the highlighted plant system as the anatomical context. Then compare the lesson observations with the evidence sources and knowledge check below so structure, process, and whole-plant consequences stay connected.- Plant system
- Leaves
- Lesson focus
- Leaf-age photosynthetic-capacity timeline and canopy map
- Study mode
- Whole-plant context
Knowledge check
PracticeCan you explain what the visual is showing?
What did repeated measurements in a hemp crown show about fully expanded leaves as they aged?
Track this lesson
Mark the lesson complete when you are comfortable with the visual, observations, and system context.
Evidence & further reading
Sources connected to this lesson
These references support specific biological, diagnostic, environmental, or process concepts used in this lesson. They are not a substitute for crop-specific testing or local regulatory guidance.Indoor Cannabis sativa leaf light-response curves across flowering, localized PPFD, temporal changes in photosynthetic capacity, and the limits of using a single leaf photosynthesis measurement as a stand-alone yield predictor.
Cannabis leaf morphogenesis, phyllotaxy, plant architecture, reproductive transition, inflorescence development, trichome development, and senescence across a complete life cycle.
Cannabis gas exchange, photosynthesis, transpiration, stomatal conductance, PPFD, temperature, and carbon-dioxide response under measured conditions.
Vapor-pressure-deficit sensing and stomatal response mechanisms in vascular plants, including hydraulic and ABA-mediated regulation.
System context