Internode
Definition: An internode is the section of stem between two neighboring nodes on a cannabis plant. Internode length, often called node spacing, depends on genetics, light intensity and spectrum, temperature and plant stage. Short internodes produce compact plants with tightly stacked buds, while long internodes create taller, airier plants with more gaps.
How Internode works
Internodes are the plant’s way of adjusting height. When a cannabis plant senses competition or dim light, it lengthens internodes to climb toward brighter conditions. When light is plentiful, there is no reason to stretch, and nodes stay close together.
What controls spacing
- Genetics: indica-leaning strains often keep 1 to 2 inch spacing; sativa-leaning ones can run 3 to 5 inches.
- Light intensity: too little light is the most common cause of long internodes indoors.
- Spectrum: blue-rich light tends to keep plants compact, while light heavy in far-red encourages stretching.
- Temperature: warm days with much cooler nights promote elongation.
- Stage: internodes lengthen sharply during the flowering stretch.
Why it affects yield
Buds form at every node. When nodes sit close together, those buds merge into a long, solid cola. When spacing is wide, you get separate popcorn buds with bare stem between them. That is why indoor growers chase tight internodes, and why stretchy strains benefit from training that brings more tops into the strongest light.
Internode length also affects how a plant handles weight. Long, thin internodes can bend under heavy buds, so support stretchy plants with stakes or a net.