Why are the lower leaves on my houseplant turning yellow?

The RHS lists too much or too little water, a pot that is too big, too little light, cold, a sudden temperature drop, or drafts as common causes. Start by checking soil moisture and the roots.

What causes brown tips on houseplant leaves?

According to the RHS, most often underwatering, followed by dry air or poor ventilation. Extension sources add excess fertilizer and salt buildup, which concentrate at leaf tips and margins.

Will yellow leaves turn green again?

Usually not. Fixing the cause stops further damage, and new leaves grow in healthy. You can trim off leaves that are fully yellow or dry.

What is the white crust on top of my potting soil?

Usually salts left behind by fertilizer or hard water. University of Maryland Extension links excess salts to browning of leaf tips and margins. Flush the soil with plenty of water or replace the mix.

Should I cut off yellow leaves?

Yes, once a leaf is mostly yellow or brown it will not recover, so trimming it with clean scissors tidies the plant. Focus first on fixing the cause, or the next leaves will follow.

Why is my variegated plant losing its variegation?

The RHS says inadequate light is often the cause, and waterlogging can also lead to color loss. It recommends pruning out plain green shoots.

Why Are My Houseplant Leaves Turning Yellow or Brown? Causes and Fixes

Yellow or brown leaves are the number one reason people go looking for houseplant help. The catch is that one symptom can have several causes, and the opposite fix (more water instead of less) makes things worse. Iowa State University Extension recommends investigating all the possible causes rather than jumping on the first one that comes to mind.

This guide walks you through it in order: describe exactly what you see, narrow down the likely causes, and only then change something.

Start with a close look

Before you water, repot, or fertilize, answer these questions:

Which leaves? Old lower leaves or the newest ones? One leaf or the whole plant?
What does the change look like? Evenly yellow, yellow between the veins, brown tip, brown edge, spots?
What’s the soil like? Soggy, bone dry, smelly? Is water sitting in the saucer?
What changed recently? New spot, repotting, heat turned on, vacation, new fertilizer?
Any insects or sticky residue? Check leaf undersides too.

Then gently slide the plant out of its pot and look at the roots. The RHS recommends this step for most leaf problems. Healthy roots are firm. According to University of Maryland Extension, roots with root rot turn brown to black, feel soft or mushy, and the outer layer slips off easily. Above ground, root rot shows up as yellowing, browning, and dieback of leaves, wilting, and poor growth.

Diagnostic table: symptom → cause → fix

Symptom	Possible causes	What to do
Lower leaves turning evenly yellow	too much or too little water, pot too large, too little light, cold, sudden temperature drop, drafts (RHS)	check soil moisture and roots, adjust watering, move to a brighter, draft-free spot
Yellowing and leaf drop after moving the plant	sudden change in light or temperature, drafts from doors, windows, or vents (Iowa State)	give it time, make changes gradually, keep it out of air currents
Yellow leaves on a plant that hasn’t been fed in a long time	nutrient deficiency (Iowa State)	fertilize during active growth at the label rate
Yellow between green veins	iron, magnesium, or manganese unavailable, often from lime in hard water; typical of acid-loving plants (RHS)	water with softer water (rainwater); use a suitable mix for acid-loving plants
Brown leaf tips or edges	more likely under- than overwatering, dry air, poor ventilation (RHS)	review watering, raise humidity
Brown tips and edges plus white crust on the soil	excess fertilizer, salt buildup (Missouri, UMD)	flush the soil, cut back on fertilizer, replace the mix if needed
Browning in the center of the leaf	overwatering (RHS)	water less, check roots and drainage
Whole leaves turning brown and dropping, top wilting	underwatering and excess heat (RHS)	water thoroughly, move somewhere cooler or shadier
Sudden collapse of the whole plant	abrupt environmental change, especially overwatering (RHS)	unpot, check the roots, remove rotten parts
Dark spots with yellow margins	fungal leaf spot (RHS)	remove affected leaves; use an approved fungicide per the label if needed
White or straw-colored spots or rings	cold water splashes, aerosol damage, watering with cold water (RHS)	water with room-temperature water, don’t spray aerosols near plants
Pale speckling, silvery patches, sticky leaves	sap-feeding pests (RHS)	inspect leaf undersides; see pest guides below
Variegated leaves fading to green	too little light, waterlogging (RHS)	more light, better drainage, prune out green shoots

Water: the most common culprit

Both the RHS and Iowa State put watering problems at the top of the list. The tricky part is that overwatering and underwatering look alike: the plant wilts and leaves yellow.

How to tell them apart:

Overwatering: the mix is still wet days after watering, water sits in the saucer, roots are dark and soft. The RHS links browning in the center of the leaf and sudden collapse to overwatering.
Underwatering: the mix is dry and pulling away from the pot, the pot feels light, leaves brown from the tips and edges. The RHS notes brown tips are more often from too little water than too much.

Root rot: University of Maryland Extension recommends avoiding excess water, using clean pots and sterile potting mix, separating infected plants from healthy ones, and discarding severely infected plants. If you want to save a valuable plant, take cuttings only from healthy tissue.

What to do: water based on how dry the mix is, not on a calendar. The RHS suggests checking plants once a week, watering little and often in summer and perhaps every two weeks in winter. Our guide on how to water houseplants covers the details.

A pot that’s too big. The RHS lists overpotting among the causes of yellowing: a large volume of mix around a small root ball stays wet for a long time. The fix is repotting into a smaller container; see how to repot houseplants.

Light

Too little light is a common cause of yellowing, according to both the RHS and Iowa State. The RHS suggests moving the plant somewhere brighter, even a south-facing windowsill in winter. Iowa State warns that a sudden change in light intensity when you move a plant also causes problems, so make moves gradually.

On the other side, when leaves brown and drop from heat and dryness, the RHS recommends moving the plant somewhere cooler or shadier, and for some types of leaf spotting it suggests moving plants away from bright windows. More in our houseplant light guide.

Light matters even more for variegated plants. The RHS names inadequate light as a frequent cause of lost variegation. If a plant is putting out all-green shoots, read our guide to variegation reversion. This applies to variegated pothos and Philodendron ‘Pink Princess’, among others.

Temperature and drafts

The RHS and Iowa State both list cold, sudden temperature drops, and drafts as causes of yellowing and leaf drop. Iowa State specifically mentions blasts of cold or warm air from doors, windows, and air ducts, and plants that weren’t protected from cold on the way home from the store.

So a new plant that drops a few leaves in its first weeks at home isn’t necessarily sick. Give it a stable spot and hold off on other changes.

Humidity

Low humidity causes browning and eventually leaf drop (Iowa State). For brown tips, the RHS suggests raising humidity, for example by setting the pot on a tray of damp gravel or expanded clay pebbles. See our houseplant humidity guide for more options.

Fertilizer and salt buildup

David Trinklein of the University of Missouri ranks excess fertilizer high among the causes of houseplant damage, particularly in winter when growth slows. Fertilizer salts collect at leaf margins and tips, where tissue dies. Softened water causes the same problem, he notes, because it contains highly soluble sodium or potassium salts.

University of Maryland Extension lists these signs of excess salts: browning or dieback of leaf tips and margins, reduced growth, lower leaf drop, dead root tips, wilting, and a white crust on the soil surface or outside of the pot.

How to flush the soil (per UMD): let water run out the drainage hole and repeat several times, each time with at least as much water as the volume of the pot. For small pots with heavy salt buildup, replacing the mix is easier.

Prevention: use the right fertilizer at the correct rate and frequency, as UMD advises, which means following the label, and cut back in winter.

Fluoride: Trinklein also notes that dracaenas and some related plants are especially sensitive to fluoride, which accumulates at leaf margins.

Pests

The RHS includes sap-feeding pests among the causes of leaf discoloration. Before you change your watering, check leaf undersides with a hand lens:

silvery patches with black specks → thrips,
fine pale stippling and webbing → spider mites,
white cottony tufts and sticky leaves → mealybugs,
tiny flies above the soil around a struggling cutting → fungus gnats.

What to do with damaged leaves

A yellow or brown leaf usually won’t turn green again. Fixing the cause stops further damage, and new leaves grow in healthy. Trim off fully yellow or dry leaves with clean scissors. For brown tips, you can cut off just the dry part, leaving a thin edge of brown so you don’t cut into healthy tissue.

Change one thing at a time and give the plant a few weeks. If you change watering, location, and soil all at once, you won’t know what helped.

Quick five-step check

Inspect leaf undersides for pests.
Check soil moisture with a finger and look for water in the saucer.
Slide the plant out and check the roots.
Think back on what changed in the last few weeks (location, heating, fertilizer).
Adjust one thing and watch the new leaves.