Plant SOS · Symptoms
Why are my plant's leaves turning yellow?
Yellow leaves are the number one complaint among houseplant owners. And for good reason: this symptom can mean just about anything — too much water, not enough water, lack of light, nutrient deficiency, natural aging. The good news is that in the vast majority of cases, the plant can fully recover if the cause is identified in time.
In this guide, we review the 6 main causes of yellowing, with distinctive signs and solutions to apply for each, starting today.
How to read a yellow leaf?
Before panicking, carefully observe three things: the location of the yellowing on the plant, the texture of the leaf (soft or dry?), and the state of the soil (wet or dry?). These three clues allow for a reliable diagnosis in a few seconds.
"A yellow leaf isn't necessarily bad news.
It's primarily a message from your plant."
1. Overwatering
Too much water in the substrate
This is by far the most frequent cause. When roots are constantly soaking in waterlogged soil, they suffocate and can no longer transport nutrients to the leaves. The leaves gradually turn yellow, then fall off.
2. Underwatering
Soil too dry between waterings
Conversely, a plant that lacks water will also turn yellow — but the signs are different. The soil is dry and shrinks from the edges of the pot, the leaves are dry and crispy rather than soft.
3. Lack of light
Insufficient exposure
Light is the fuel for photosynthesis. A plant in too dark a place can no longer produce the chlorophyll that gives leaves their green color. They gradually fade, become yellow-green, then fall off.
4. Nutrient deficiency
Depleted soil or lack of fertilizer
A substrate used for more than a year gradually becomes depleted. Nitrogen deficiency is the most common: it causes yellowing that starts with the oldest leaves and moves up the plant.
⚠ Do not confuse
An iron deficiency produces a specific yellowing: the leaf blade turns yellow but the veins remain green. This is often linked to an unsuitable substrate pH or excessive lime in the watering water. Use filtered water or rainwater.
5. Natural renewal
Normal aging of leaves
All plants shed their oldest leaves to produce new ones. This phenomenon only affects the bottom, oldest leaves, while the top of the plant remains green and active. This is completely normal — and is often confused with a problem.
6. Pests or disease
Infestation or fungal infection
Spider mites, mealybugs, aphids, or fungal diseases can cause localized and rapid yellowing, often accompanied by other visible symptoms: spots, specks, white down, presence of insects under the leaves.
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Launch the diagnosis🌿 Guide written by the Douceur Maison Plant SOS team.
We write practical guides to help enthusiasts care for their houseplants. · sosplantes@douceurmaison.fr