Internode
The section of stem between two nodes on a cannabis plant, used as a quick proxy for plant structure and stretch.
Internode length is a real, useful structural trait — short internodes mean a denser, more compact plant; long ones mean a stretchy, lankier plant. It's a handy shorthand growers use when picking phenotypes or judging stretch. What it isn't: a reliable indicator of 'indica vs sativa,' potency, or yield on its own. Plenty of folklore leans on internode spacing to predict things it can't actually predict. Treat it as one structural data point, not a crystal ball.
Definition
An internode is the segment of stem between two nodes — the points on a cannabis plant where leaves, branches, or flowers emerge [1][2]. In plain terms: nodes are the joints, internodes are the bones between them.
Internode length is typically measured in centimeters or inches between the center of two consecutive nodes on the main stem. Growers also talk about internode spacing on lateral branches, which affects bud site density.
What it tells you
Internode length is a structural trait influenced by genetics, light intensity, light spectrum, and temperature Strong evidence[3]. Generally:
- Short internodes (1–3 cm) produce compact, bushy plants with tightly stacked bud sites. Common in plants selected for indoor growing and in many cultivars marketed as 'indica.'
- Long internodes (5+ cm) produce taller, more open plants with airier flower structure. Common in equatorial and 'sativa'-leaning cultivars.
Far-red light and low light intensity both stretch internodes via the shade-avoidance response, mediated by phytochromes Strong evidence[3][4]. This is why plants stretch under weak or distant lighting and why far-red supplementation is sometimes used deliberately.
What it doesn't tell you
Internode length is not a reliable predictor of:
- Cannabinoid or terpene content. Chemistry tracks with genetics and chemovar, not stem geometry Strong evidence[5].
- Effects on the consumer. The 'short internodes = sedating indica' shorthand is folklore, not science Disputed. See Indica vs Sativa.
- Yield. A compact plant can out-yield a stretchy one or vice versa depending on training, light, and finish density.
It's a structural cue, useful for planning canopy height and training strategy — nothing more.
Used in articles about
Internode is commonly referenced in articles on Topping, Low-Stress Training, Stretch, Phenotype Selection, and Light Intensity (PPFD).
Sources
- Book Clarke, R. C., & Merlin, M. D. (2013). Cannabis: Evolution and Ethnobotany. University of California Press.
- Book Cervantes, J. (2006). Marijuana Horticulture: The Indoor/Outdoor Medical Grower's Bible. Van Patten Publishing.
- Peer-reviewed Magagnini, G., Grassi, G., & Kotiranta, S. (2018). The Effect of Light Spectrum on the Morphology and Cannabinoid Content of Cannabis sativa L. Medical Cannabis and Cannabinoids, 1(1), 19–27.
- Peer-reviewed Casal, J. J. (2013). Photoreceptor signaling networks in plant responses to shade. Annual Review of Plant Biology, 64, 403–427.
- Peer-reviewed Hazekamp, A., Tejkalová, K., & Papadimitriou, S. (2016). Cannabis: From cultivar to chemovar II—A metabolomics approach to cannabis classification. Cannabis and Cannabinoid Research, 1(1), 202–215.
How this page was made
Generation history
Drafting assistance and fact-check automation are used, with a human operator spot-checking on a weekly basis. See how articles are made.
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