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Gardening glossary

Internode

If a node is where things attach — leaves, buds, branches — an internode is the empty stretch of stem in between. Internode length is one of the fastest, most reliable visual indicators of how happy a plant is with its light, temperature, and nutrition.

What internode length tells you:

- **Short, compact internodes** indicate good light, balanced nutrition, and a healthy hormonal state. A pothos grown in bright indirect light has internodes of 1.5–3 cm and a leaf at every node — a lush, full appearance. - **Long, stretched internodes** signal etiolation: the plant is reaching for light. Stems become thin, pale, and floppy, with 10–20 cm of bare stem between leaves. This is your plant telling you the light is insufficient. - **Unusually short or compressed internodes** combined with small new leaves can signal disease (especially viral), micronutrient deficiency, or growth-regulator residue.

How internodes form. As a growing tip elongates, cells just behind the apical meristem divide and elongate to push the new node further from the previous one. Light intensity and the red:far-red ratio of available light control how much cells elongate. Bright direct light (high red, low far-red) keeps internodes short; shade conditions (high far-red) trigger the "shade avoidance response" and cells stretch dramatically.

Practical uses for gardeners:

- **Diagnosing seedling problems.** Seedlings with 3 cm tall stems and tiny leaves on top are leggy and etiolated — move them closer to the light immediately, or they will collapse. - **Reading houseplant health at a glance.** Walk past a monstera and compare the spacing of the leaves. If a new leaf is twice the distance from the previous one as the older leaves, your light has dropped. - **Pruning decisions.** When cutting back a leggy plant, always cut to a node. New shoots emerge from the node above the cut, so any stem you leave below the cut is just dead weight. - **Propagation cuttings.** Aim to take cuttings with at least two nodes and one internode — the lower node goes into the substrate, the upper one stays above for new growth.

Where this comes up in our guides

Related terms

Node

A node is the joint on a plant stem where leaves, buds, and roots emerge. The space between two nodes is called an internode. Nodes are the single most important feature when taking cuttings — no node, no roots.

Etiolation

Etiolation is the pale, stretched, leggy growth a plant produces when it isn't getting enough light. Stems elongate, internodes get long, leaves get smaller and lighter, and the whole plant reaches toward the nearest window in search of more photons.

Phototropism

Phototropism is the directional growth of a plant in response to light. Shoots grow toward the light source (positive phototropism) and roots grow away (negative phototropism). The hormone auxin redistributes to the shaded side, making those cells elongate faster and the stem bend.

Leaf axil

A leaf axil is the angle where a leaf meets the stem. Inside that crook sits an axillary bud that can grow into a new branch, flower, or sucker. Most pruning, pinching, and pollination decisions revolve around what's happening at the leaf axil.

Propagation

Propagation is creating new plants from an existing one — through cuttings, division, layering, or seed. Most houseplants propagate easily from stem cuttings rooted in water or soil, making it the cheapest way to grow your collection.