Why are my snake plant leaves turning yellow?
A snake plant puts up with nearly everything except too much love. When it turns yellow, most of the time it isn’t a lack of care: it’s too much care, in the form of water.
On a snake plant, soft, yellow leaves, starting at the base, are almost always too much water: the roots and rhizome are rotting. If the leaves yellow but turn wrinkled and dry, it’s the opposite problem. Before anything else, push a stick to the bottom of the pot: if it comes out with damp soil, hold off watering.
What kind of yellow is it?
A snake plant (Dracaena trifasciata, formerly Sansevieria) stores water in its thick leaves. So the yellow nearly always says the same thing in different ways:
- Soft yellow, starting at the base, with damp soil. Too much water and rot. By far the most common.
- Brownish yellow, wrinkled leaf, soil dry for a long time. Genuine thirst.
- One outer leaf slowly turning yellow, the rest fine. Natural ageing.
- Soft and darkened after a cold night. Cold.
- Yellow edges from the start. Some snake plants, such as the gold-edged kind (‘Laurentii’), have yellow drawn into their edges. That isn’t a problem.
Is it too much water?
A snake plant comes from dry regions, and its roots aren’t made for wet soil. With always-damp soil they run out of air and rot, and the rot climbs up the rhizome to the leaves. The yellow is the first warning.
How to confirm. Push a skewer to the bottom of the pot and pull it out. If damp soil clings to it, the plant is drinking less than you’re giving it. Other signs: leaves folding at the base, a musty smell, fungus gnats around the pot.
What to do.
- Let the soil dry all the way down before you water again.
- Empty the saucer or the decorative pot, if the plant sits in one.
- Confirm the pot has a hole in its base.
- If the base is soft or a leaf falls at the lightest touch, take the plant out of the pot. Healthy rhizomes and roots are firm and pale; rotten ones are dark, soft and smell bad. Cut off what’s rotten with clean scissors, back to firm tissue, let it dry for a day or two and repot in fresh cactus soil, in a pot with a drainage hole. If only a few roots are damaged, snipping those off is enough.
After that, the rhythm depends on the spot: with no window, the soil takes ages to dry.
| Where it lives | In July | In January |
|---|---|---|
| South- or west-facing window | 11 days | 21 days |
| East-facing window | 12 days | 24 days |
| North-facing window | 19 days | 38 days |
| Hallway or corner with no window | 27 days | 54 days |
The step-by-step watering is in how often to water a snake plant.
What if it’s thirst?
It’s rare, but it happens when the plant goes months without water in a bright, warm spot. The leaves wrinkle, lose firmness and turn yellow with brownish tones; the soil is hard and the pot barely weighs anything. Water slowly and thoroughly and empty the saucer. Wrinkled leaves regain their firmness gradually, and the worst affected may not come back. A way to tell the two apart: slide the plant out of its pot, and dry roots that are pale or rust-coloured point to thirst, while dark, mushy ones point to too much water.
Could it be the cold?
Keep the plant above 10 °C, because it comes from warm climates: in the cold, leaves darken, go soft and the whole plant can collapse, which is common in unheated rooms in winter. Move it away from cold windows, doors and draughts, and don’t water it until the soil has dried again. If the leaves are soft or flopping, read why a snake plant droops or falls over; for light, can a snake plant live in low light or sun?.
What about pests?
They’re uncommon, but mealybugs (little white, cottony blobs on the leaves, especially near the base) and spider mites suck the sap and leave yellow speckles. Wipe the leaves with a cloth or a cotton bud dipped in alcohol and, if they persist, use insecticidal soap.
Do yellow snake plant leaves need cutting off?
A leaf that has gone fully yellow or dark won’t recover. Cut it off flush with the base using clean scissors. If it’s only slightly yellow, leave it: the plant is still using what’s left.
If the leaf you cut was soft and rotten, check the base: if the rot goes on, you’ll have to take the plant out of its pot.
Summary: which yellow is this?
| What you see | Most likely cause | What to do |
|---|---|---|
| Soft yellow at the base, damp soil | Too much water, rot | Stop watering, check the pot and base |
| Wrinkled and dry, hard soil | Thirst | Water thoroughly, until it drains |
| One outer leaf, slowly | Ageing | Nothing |
| Soft after a cold night | Cold | Move away from windows and draughts |
| Yellow dots and cotton | Pests | Wipe, isolate the plant |
Quick questions
Will a yellow snake plant leaf turn green again? No. You can cut it off, and new leaves grow green once the cause is fixed.
Can I save the plant if the rhizome has rotted? Often, yes: use the firm, pale part, or take leaf cuttings, as in how to propagate a snake plant.
Where is the rest of the care? In the guide to how to care for a snake plant, and the snake plant page shows the watering by spot.
The same yellow, different rhythms
Whether the yellow is a problem depends on the rhythm the plant drinks at, and that rhythm changes with light, pot and month. In July, at an east-facing window, in a 16 cm plastic pot, it needs water every 12 days. The Verdejar app does this maths for your plant and reminds you on the right day.
Sources: Royal Horticultural Society · Missouri Botanical Garden · Royal Botanic Gardens, Kew · NC State Extension · Penn State Extension · Iowa State University Extension · University of Illinois Extension · Clemson Home & Garden Information Center · University of Maryland Extension. The days between waterings come from the Verdejar watering engine.