Pothos has a reputation for growing in almost anything, so a stalled one feels like a failure. It usually is not — it is a plant doing exactly what its conditions allow.
Three causes account for nearly all of it, and they are easy to separate.
1 · Not enough light
The most common by a wide margin, and the most misunderstood, because pothos tolerates low light without growing in it. Tolerating and thriving are different things, and the plant shows the difference clearly.
Signs the plant wants more light:
- Long gaps between leaves along the stem, where a well-lit plant has them close together.
- New leaves smaller than older ones.
- Variegation fading. A marble queen or golden pothos going plain green is the plant dropping the pale tissue it cannot afford, because only the green parts photosynthesise.
Move it to bright indirect light — near a window but out of direct midday sun. Growth usually resumes within a few weeks in the growing season.
Note the trap in that last sentence: a variegated pothos in low light gets greener and grows slower, and people often respond by moving it further from the window because they think the sun is bleaching it. It is the opposite.
2 · It is the wrong time of year
Pothos grows in spring and summer and slows or stops in autumn and winter. Less light, shorter days, cooler temperatures.
A plant that has not put out a new leaf since October is not sick. Feeding it will not help — an unfed plant that is not growing needs light and warmth, not nutrients it cannot use — and watering at summer frequency in winter is how a healthy dormant plant is rotted.
3 · It has run out of root space
Signs:
- Roots coming out of the drainage holes, or circling visibly on the surface.
- Water runs straight through and out the bottom in seconds.
- The pot dries out very quickly, needing water every few days.
- The plant lifts out as a solid mass of root with almost no visible soil.
Repot into a container one size up — around 2–3 cm wider — in fresh mix. Going much bigger is counterproductive: a large volume of wet soil with no roots in it stays wet and invites rot.
Less common causes
- Fertiliser burn. Too much feed damages roots and stalls growth. A white crust on the soil surface points here; flush the pot thoroughly with water.
- Never fed at all for a year or more in the same soil. Half-strength balanced feed monthly in spring and summer is enough.
- Cold draughts. A spot beside a frequently opened external door in winter stalls growth even in good light.
- Pests. Check leaf undersides and stem joints for spider mites or mealybugs. Both slow growth before they become obvious.
What is normal and not a problem
- One old leaf yellowing occasionally. Plants shed old growth.
- No growth from November to March in a temperate climate.
- Slower growth after repotting for a few weeks while roots re-establish.
Making it fuller rather than longer
A pothos that is growing but looks sparse has a different problem from one that is not growing. Long bare vines with leaves only at the ends is the light problem above, but even a well-lit plant naturally trails rather than bushes.
Cut the vines back and root the cuttings in the same pot. That is the only reliable way to get a full plant, and the cuttings root readily in water or straight into moist mix.