Why Houseplant Leaves Turn Yellow | Identify the Cause by Which Leaves Yellow First, Then Treat It by Plant and Season

Conclusion: How Do You Tell Why Houseplant Leaves Are Turning Yellow?

You tell the cause of yellow houseplant leaves by where the yellow leaves are on the plant. Lower leaves, new leaves, or leaf tips: each position points to its own group of causes.

In general, the causes are sorted into six. Gardening product makers' guides and US university extension services list the same six.

• Overwatering
• Underwatering
• Insufficient light
• Too much or too little fertilizer
• Cold
• Natural lifespan of old leaves

The trouble is that with six possible causes, it is hard to know which to suspect first. Here is the key. Looked at by position, the six causes fall into three groups.

The reason is that nutrients move from old leaves to new leaves (explained in a later section).

This article goes in this order.

• Narrow it down with the symptom chart
• Causes and fixes for each of the three groups
• Differences between Monstera, Pachira, Pothos, Ficus microcarpa, and Sansevieria
• Differences in summer, in winter, and right after repotting
• Judging whether the plant can recover, and the steps to take
• What not to do, and a prevention checklist

Every figure comes with a source.

How Do You Find the Cause from a Houseplant's Leaf Symptoms?

Match the symptoms that appear before and after the leaves turn yellow to the chart below. Where you look depends on whether there is wilting, leaf drop, or spotting.

Other symptoms often show up together with the yellowing. First, find the row in the chart that is closest to what you are seeing now.

The "first things to try" in the chart are all checks you can do today with no tools. Before adding water or fertilizer, checking one thing at a time is the fastest route.

How Do Houseplant Leaves Turn Yellow?

Chlorophyll breaks down, and the yellow pigments left behind become visible. In old leaves, the plant breaks it down on purpose to reclaim nutrients.

Chlorophyll is the pigment that makes leaves look green. Houseplant leaves turn yellow because this chlorophyll breaks down.

Once it breaks down, the yellow pigments (carotenoids) that were in the leaf all along become visible. Yellow is not a "newly made color" but "the color that shows once the green is gone."

In the "Plant Q&A" of the Japanese Society of Plant Physiologists, Koji Asada explains it this way: leaves turn yellow because chlorophyll breaks down and the carotenoids remain.

The important point is that chlorophyll breakdown is not always a sign of damage. In old leaves, the plant itself breaks down the proteins inside the leaf.

The broken-down proteins (such as rubisco, the photosynthesis enzyme) are reclaimed as amino acids. These reclaimed nutrients are sent to new leaves and to the trunk.

In the same Q&A, Hidemasa Imaseki explains: in aging leaves, rubisco is broken down and free amino acids are produced. The reclaimed substances move to the parent plant.

In other words, when the lower, older leaves yellow and drop one after another, that can also be the normal process of the plant pulling nutrients back.

This movement of nutrients from old leaves to new leaves is why position tells you the cause. Cornell University's nutrition material sums it up as follows.

• When mobile nutrients (nitrogen, phosphorus, potassium) run short, symptoms show up first on old leaves
• When immobile nutrients (calcium, iron) run short, symptoms show up first on new leaves

If yellowing starts on old leaves, read it as "the plant is pulling nutrients back" or "weak roots cannot take them up." If it starts on new leaves, read it as "materials the plant cannot move are not arriving."

Why Do the Lower Leaves Turn Yellow?

Yellowing from the lower leaves comes from overwatering, root binding, or the natural lifespan of old leaves. The most common cause is overwatering.

Among questions about yellow houseplant leaves, yellowing that starts at the lower leaves is the most common. Clemson University's material names overwatering as the number one reason indoor plants decline.

Too much water cuts the oxygen around the roots and leads to root rot (roots dying and turning black and soft). The Hyponex Pachira guide also says "the most common cause of a plant dying is root rot."

If you habitually water again before the soil dries, the roots are damaged first. Unable to take up nutrients, the plant then turns yellow from the lower leaves.

The usual advice is "water when the soil surface is dry." The Hyponex guides for Monstera, Pothos, and Pachira say the same.

But the surface often looks dry while the soil below is still moist. Here is the key. Push your finger in up to the second knuckle (about 3 cm): if it is dry, water; if it is moist, wait.

For yellowing from the lower leaves, these three comparisons narrow down the cause.

The sign of root binding appears in the Hyponex Ficus microcarpa (Chinese banyan) guide: "the leaves turn yellow and the whole plant lacks vigor." Roots coming out of the pot bottom are the cue to repot.

The right time to repot differs by plant. It is summarized in the section on individual plants.

The natural lifespan of old leaves is treated as routine care in Cornell University's list of indoor plants: "eventually the lower leaves turn yellow; remove them." One or two leaves are nothing to worry about.

Why Do New Leaves Turn Yellow?

Yellowing from the new leaves comes from insufficient light or a lack of nutrients that do not move easily, such as iron. Suspect light first, then nutrients.

When houseplant leaves turn yellow starting from the new leaves at the top, the cause is different from yellowing that starts at the lower leaves.

University of Maryland material describes indoor plants that lack light like this: they stretch toward the light, their leaf color fades, and growth is poor.

Cornell University's list says this about Monstera: in weak light, new leaves stop developing splits.

There are three signs of insufficient light.

• New leaves are small
• Color is pale
• Only the stems keep stretching

Light changes greatly with distance from the window. The University of Maryland material says "light intensity drops off rapidly as distance increases."

The same material also gives a guide by window direction.

• North-facing windows, or rooms with only artificial light: low light
• East- or west-facing windows: medium light
• South-facing windows: high light

The Hyponex Pothos guide recommends "a bright spot behind a lace curtain" indoors. If a plant sits deep inside the room, first move it to within 1 m of a window.

Sudden direct sun causes leaf scorch. As Iowa State University material notes, change the brightness in steps.

If new leaves show "green veins with yellow between them," suspect a lack of nutrients that do not move easily, such as iron.

Texas A&M University material explains iron deficiency like this: it shows up first on young leaves, with yellow between the veins. When the soil pH (how acidic or alkaline it is) is high, iron does not dissolve and this happens.

This is not a common cause for indoor houseplants. Check light and roots first. If only the new leaves are still yellow after that, give a liquid houseplant fertilizer at the dilution on the label.

Why Do Leaves Turn Yellow from the Tips and Edges?

Yellowing from the tips and edges comes from dry air, too much fertilizer, or air conditioner drafts. The parts that water reaches least are damaged first.

When houseplant leaves turn yellow, there is a pattern where the tips and edges turn brown and die back. The farther a spot is from the center of the leaf, the harder it is for water to reach.

Clemson University material lists three causes of browning at leaf tips and edges.

• Dry, warm air
• Buildup of fertilizer salts (fertilizer residue that has hardened in the soil)
• Fluoride and chlorine in tap water

University of Wisconsin material also says that dry indoor air in winter turns leaf tips brown.

Fertilizer salts can be seen with the eye. University of Nebraska material explains it like this.

• Excess salts harden into a yellow to white crust on the soil surface
• High salt levels in the soil damage roots directly
• Brown leaf tips, dead root tips, and wilting are signs of salt buildup

The fix is to flush them out. The same material recommends "leaching" (flushing out salts) once every 4 to 6 months. Slowly run water equal to twice the pot's volume through from the top.

Air conditioner drafts cause dryness and temperature swings at the same time. The Hyponex Ficus microcarpa guide warns that a direct draft dries the plant quickly, so leaves get damaged or drop.

The Monstera guide also says to keep the plant out of air conditioner drafts when choosing its winter spot.

Here is the key. If only the leaf tips are yellow, first move the plant out of the draft. Next, check the soil surface for white powder and stop fertilizing.

Do Monstera, Pachira, Pothos, Ficus microcarpa, and Sansevieria Differ?

Yes. The causes of yellow houseplant leaves come in a different "order of likelihood" for each plant.

Even for yellowing lower leaves, with Sansevieria you suspect root rot first, while with Ficus microcarpa you also suspect a move or the cold.

We compared the five plants using the makers' growing guides and the hardiness ratings of the Royal Horticultural Society (RHS). In the RHS ratings, H1b means "minimum 10 to 15℃" and H1c means "minimum 5 to 10℃."

For Monstera, the Hyponex guide says that leaves short of water turn yellow and die from the bottom up. This is an example of yellow lower leaves that do not necessarily mean overwatering.

If the soil is dry all the way down, it is underwatering; if it is moist, it is root rot. Tell them apart with your finger.

Source: Hyponex Plantia care guides, RHS hardiness ratings, ASPCA toxic plant list

Sansevieria is quite different from the other four. The Hyponex guide says the following.

• It does not tolerate overly wet soil
• It goes dormant in winter, so keep it on the dry side. Once a month or so is enough
• Below 10℃ growth stops, so do not water at all

If a Sansevieria has yellow leaves and soft bases, the cause is almost certainly water. Leave longer gaps between waterings than for the other four.

Lining up the five plants' light, water, and minimum temperature shows why they should not all be watered on the same schedule.

Source: Hyponex Plantia care guides, RHS hardiness ratings, ASPCA toxic plant list

The best time to repot differs by plant (all from Hyponex guides).

• Monstera: May to September, once every 2 years
• Pachira: April to June and September, once every 1 to 2 years
• Pothos: May to August, once every 2 to 3 years
• Ficus microcarpa: May to June, once every 1 to 2 years
• Sansevieria: May to August, once every 1 to 2 years

Even if root binding is the cause, repotting in winter does more harm. It is safer to water sparingly and wait until spring.

Do the Causes Change in Summer, in Winter, or Right After Repotting?

Yes. In summer the main causes are light and heat, in winter they are cold and water left in the soil, and right after repotting it is the change in environment.

The causes of yellow houseplant leaves shift with the seasons. Even for the same plant, change which cause you suspect first depending on the time of year.

For summer, the guides for Pachira, Pothos, and Sansevieria all say "direct midsummer sun causes leaf scorch."

University of Maryland material says that too much light makes "leaves fade, turn brown, and die."

Leaf scorch is less yellow than bleached white, turning brown afterward. That makes it easy to tell apart from yellowing that starts at the lower leaves.

For winter, the Hyponex overwintering guide says: plants that die in winter are often killed by watering problems. Reduce the amount or frequency of watering. Entryways and windowsills get cold without you noticing.

Clemson University material also describes "cold water spotting," white spots on leaves caused by cold water. In winter, the basics are to water less, use room-temperature water, and keep plants away from the window at night.

University of Wisconsin material says not to add fertilizer in winter because growth slows down. Resume once the plant starts growing actively in spring.

Yellowing right after repotting or after a change of location is covered in Clemson University material: leaf drop from a change in environment usually settles down in about 3 weeks.

The Hyponex Ficus microcarpa guide gives the same caution: the plant may drop leaves right after purchase or after being moved.

Do not add fertilizer during this period. The instructions for Hyponex liquid concentrate also say "when planting or repotting, start after 2 to 3 weeks."

Can a Yellowed Houseplant Recover?

If the roots and trunk are still alive, it can recover. Yellowed leaves do not turn green again, so judge by whether the plant has the strength to put out new leaves.

When houseplant leaves turn yellow, look at the roots and trunk, not the leaves.

The yellowed leaves themselves will not turn green again, because their chlorophyll has already broken down. Hyponex guides also say "scorched leaves do not recover."

Clemson University material draws the line for root rot by how much of the root system is affected.

• If only a few roots are damaged, cut them off and repot in clean soil
• If most of the roots are black, soft, and dead, discard the plant

The Hyponex Sansevieria guide gives early care.

• If you stop watering, let the soil dry, and keep the plant in a well-ventilated spot, it may recover
• When repotting, cut off darkened or rotten roots with scissors

As steps, it looks like this.

Before you think "it's dead, throw it out," it is worth trying if even a little white root remains. Even with no roots, plants that root from their stems, like pothos, can be restarted by putting a green stem in water.

What Should You Not Do When Houseplant Leaves Turn Yellow?

The thing to avoid most is trying to perk the plant up by "adding" fertilizer or water. In many cases, adding backfires.

When houseplant leaves turn yellow, it is tempting to add something. Below are common remedies and the reasons the sources give.

On fertilizer, the instructions for Hyponex liquid concentrate also carry cautions: "when planting or repotting, start after 2 to 3 weeks" and "use up diluted solution."

For houseplants, the standard is a 500x dilution (20 mL of concentrate in 10 L of water) once a week. Making it stronger does not make it work faster; it only adds salt. Fertilize only after you have fixed the cause and new buds have started growing.

How Do You Keep Houseplant Leaves from Turning Yellow?

Review placement and watering habits once a month. Going down the table below lets you act before the leaves turn yellow.

Most causes of yellow houseplant leaves can be prevented through placement and watering habits.

Spider mite symptoms are described in Clemson University material.

• Pale speckles appear on the upper leaf surface, and the leaf looks faded overall
• In heavy cases, thread-like webbing is visible
• If left alone, the leaves turn yellow

The first step is "isolate the suspect plant." If the leaves are yellow and a close look shows countless tiny dots, the cause is pests, not water or light.

What Terms Come Up When Houseplant Leaves Turn Yellow?

Frequently Asked Questions About Yellow Houseplant Leaves

My plant's leaves have turned yellow. Is there a way to bring it back?

Yes. However, the yellowed leaves themselves will not turn green again.

The steps are below. The goal is to grow the next leaves healthy.

• Stop watering and let the soil dry
• Look at the roots; if white roots remain, fix the cause and wait
• If most of the roots are black and soft, cut off the damaged roots and repot in fresh soil
• Give no fertilizer for 2 to 3 weeks after repotting

Do I need to cut off yellow houseplant leaves?

Fully yellow leaves can be cut off at the base. Cornell University material also treats removing yellow lower leaves as routine care.

On a half-yellow leaf, the green part is still photosynthesizing. Cut off only the dead tip and keep the rest. Fixing the cause so the next leaves do not turn yellow matters more than cutting.

Are yellow leaves caused by underwatering?

Sometimes. But for indoor houseplants, overwatering is the more common cause.

You cannot tell which from the leaf color. The answer is in the soil.

• If your finger feels dry 3 cm down, it is underwatering
• If it feels moist, it is overwatering

As the Monstera guide says, underwatering also makes lower leaves yellow and die. Leaf position alone cannot decide it, so always check the soil.

What causes houseplant leaves to turn yellow?

There are six main causes: overwatering, underwatering, insufficient light, too much or too little fertilizer, cold, and the natural lifespan of old leaves.

You do not need to suspect all six one by one. Which leaves turn yellow first narrows it down to three groups.

• From the lower leaves: overwatering, root binding, or the natural lifespan of old leaves
• From the new leaves: insufficient light, or a lack of nutrients such as iron
• From the tips: dry air, too much fertilizer, or air conditioner drafts

Just one lower leaf is yellow. Can I leave it alone?

Yes. It is normal for the bottom 1 to 2 leaves to turn yellow and drop one after another.

The plant is reclaiming nutrients from its old leaves. If the other leaves have good color and shine and new buds are growing, just remove the yellow leaf. If leaf after leaf keeps turning yellow, check the watering and the roots.

Will fertilizer fix yellow leaves?

In most cases, no. Most yellowing comes from water, light, and root problems; lack of fertilizer comes after those.

Fertilizing a weakened plant, a freshly repotted plant, or a plant in winter dormancy lets the salts damage the roots and makes things worse. Fertilize only after you have fixed the cause and new buds have started growing. Use a houseplant fertilizer at the dilution on the label.

Leaves turn yellow and drop in winter. Is my plant dead?

Often the plant is just dropping leaves for a while because of the cold. If the trunk is firm, buds will start growing in spring.

According to the sources, Pachira stops growing at 10℃, and Ficus microcarpa drops its leaves at 5℃ or below.

Winter care comes down to three things.

• Move it away from the window at night
• Wait 2 to 3 days after the soil dries, then water lightly
• Stop fertilizing and wait for spring

If the trunk or base is squishy, root rot has set in. Check the roots.

Sources

• Japanese Society of Plant Physiologists, Plant Q&A: "Why is only chlorophyll broken down when leaves change color in autumn?" (in Japanese. Answer by Koji Asada)
• Japanese Society of Plant Physiologists, Plant Q&A: "Nitrogen recovery" (in Japanese. Answer by Hidemasa Imaseki)
• Cornell University Nutrient Management: Basic Concepts of Plant Nutrition (nutrient mobility and which leaves show symptoms)
• Texas A&M AgriLife Extension: Iron Deficiency (iron deficiency shows first on young leaves)
• Clemson University HGIC: Houseplant Diseases & Disorders (overwatering, root rot, salt damage, cold water spotting, environmental change)
• Clemson University HGIC: Common Houseplant Insects & Related Pests (spider mite symptoms and isolation)
• University of Nebraska-Lincoln Extension: Success With Houseplants - Fertilization (when not to fertilize, salt buildup, leaching)
• University of Maryland Extension: Lighting Indoor Plants (distance and light, symptoms of too little and too much light)
• University of Wisconsin-Madison Extension: Keys to Healthy Houseplants (dry winter air, drafts, winter fertilizing)
• Iowa State University Extension: What causes leaves on my houseplant to turn yellow or brown and drop off? (temperature, drafts, sudden changes in light)
• Cornell Cooperative Extension Monroe County: Growing Requirements for Foliage House Plants (minimum night temperatures and care for Monstera, Sansevieria, and others)
• Hyponex: How to Grow Monstera and Growing Tips (in Japanese)
• Hyponex Plantia: How to Grow Monstera (in Japanese. Watering by season, causes of yellow leaves)
• Hyponex: How to Grow Pachira and Growing Tips (in Japanese)
• Hyponex Plantia: How to Grow Pachira | Is Watering Why It Is Dying? (in Japanese)
• Hyponex: How to Grow Pothos and Growing Tips (in Japanese)
• Hyponex Plantia: How to Grow Pothos (in Japanese)
• Hyponex Plantia: How to Grow Ficus microcarpa (in Japanese)
• Hyponex: How to Grow Sansevieria and Growing Tips (in Japanese)
• Hyponex Plantia: How to Grow Sansevieria (in Japanese)
• Hyponex Plantia: How to Grow and Repot Sansevieria (in Japanese)
• Hyponex Plantia: 18 Cold-Hardy Houseplants and Key Points for Overwintering (in Japanese)
• Hyponex: Hyponex Liquid Concentrate (in Japanese. Dilution rate, use after repotting)
• RHS: Monstera deliciosa
• RHS: Pachira aquatica
• RHS: Epipremnum aureum
• RHS: Ficus microcarpa
• RHS: Dracaena trifasciata
• ASPCA: Swiss Cheese Plant (Monstera)
• ASPCA: Money Tree (Pachira)
• ASPCA: Golden Pothos (Pothos)
• ASPCA: Fig (Ficus benjamina)
• ASPCA: Snake Plant (Sansevieria)