forestStem symptoms

Crown Rot

Dark, soft, mushy tissue where the stem meets the soil, often with a foul smell and the youngest center leaves collapsing first — most commonly caused by overwatering, poor drainage, water sitting in the crown, or a crown buried below the soil line.

High RiskNeeds Closer CheckingEnvironment-related

warningSeverity hint

Crown rot destroys the growing point — once center leaves turn mushy and pull away, the plant cannot regrow, so damage becomes irreversible within days; treat immediately.

Key Symptoms

Match the visible pattern before looking for causes.

Base of stem turns dark and feels mushy

The crown right where the stem meets the soil looks dark, water-soaked, and feels soft or squishy when you gently press it, instead of firm. You may see a dark band circling the base.

Center leaves turn brown-black and collapse inward

The youngest leaves in the middle turn dark and feel soft and mushy first, and may pull away with a gentle tug, while the outer leaves can look normal at first.

Small sunken dark spots dot the lower stem

You see scattered, water-soaked or sunken spots just above the soil on the lower stem, rather than one even band around the whole base. The spots feel soft and damp when you touch them gently.

Foul musty smell rises from the crown base

When you lean close to the base, you notice a sour or rotten odor coming from the mushy crown or the soil right around it. Healthy soil should smell earthy, not foul.

Lower leaves turn yellow and feel soft, not crispy

Lower leaves turn yellow and feel limp and soft to the touch, not dry and crispy. The plant may also wilt or droop even though the soil still feels damp.

Start With What You See

Choose the situation that best matches your plant.

Lower leaves are turning yellow and feel soft, and the soil still feels damp 1 to 2 inches deep several days after you watered

When soil stays soggy for days, the soggy crown loses oxygen and softens at the soil line. This is the most common trigger for crown rot indoors.

Quick check

Feel the soil about 1 to 2 inches deep — is it still damp even though you watered a few days ago?

Likely cause: Overwatering

See Treatmentarrow_forward

Water pools on the soil surface or stays in the saucer or outer pot for hours after watering, and the soil feels dense like packed mud

Without a way out, water keeps the crown sitting in moisture with no air. Fixing drainage lets the base dry and stops the rot from spreading.

Quick check

Lift the pot and look underneath for drainage holes, and check if water is still sitting in the saucer an hour after watering.

Likely cause: Poor Drainage

See Treatmentarrow_forward

The center leaves or growing point turned brown-black and mushy first while outer leaves still looked okay, after you watered from above or misted the crown

Water that sits in the tight center keeps the youngest tissue wet for hours. That damp pocket is where rot often starts before it spreads outward.

Quick check

Gently part the center leaves and feel where they meet the stem — do you still see pooled water or damp tissue hours after watering?

Likely cause: Water in Crown

See Treatmentarrow_forward

The base looks dark and soft right where soil or mulch is piled against the stem, after you repotted deeper than before or mounded soil up around the base

When the crown is buried, damp soil stays in direct contact with soft stem tissue and can carry fungi right to it. Exposing the crown to air helps it dry and keeps it away from soil-borne spores.

Quick check

Gently brush soil or mulch away from the base — does the crown sit below the soil line instead of just at the surface?

Likely cause: Buried Crown

See Treatmentarrow_forward

Not sure, or more than one of these sounds familiar

Walk through a quick step-by-step check to separate wet soil, drainage, trapped crown water, and a buried base.

Continue to Diagnostic flowarrow_forward

Common Causes

Start from the top. Match what you can observe, then use one check to confirm.

Overwatering

Best Match If

checkSoil still feels wet or damp to the touch 1 to 2 inches deep many days after watering
checkPlant wilts even though the soil is still wet
checkPot feels unusually heavy when you lift it days after watering
checkFoul smell from the soil at the base and lower leaves turn yellow and feel soft

Next Check

Push your finger 1 to 2 inches into the soil — if it still feels wet or damp to the touch, overwatering is likely.

Why It Happens

When you water too often without letting the soil dry between waterings, the soggy soil loses oxygen and becomes anaerobic → roots suffocate and weaken and cannot take up water → fungi like Pythium and Phytophthora that thrive in warm, wet soil invade the weakened crown at the soil line, turning the base brown-black, soft and mushy and causing wilting even though the soil is wet.

Poor Drainage

Best Match If

checkPot has no drainage holes or water has nowhere to go
checkWater pools on the soil surface or drains very slowly
checkSoil feels dense and compacted, like packed mud when wet
checkWater sits in the saucer or outer cache pot for hours after watering

Next Check

Lift the pot and look underneath for drainage holes — if there are no holes, poor drainage is likely.

Why It Happens

When your pot has no drainage holes or the soil is dense, old, broken down and compacted, water pools around the base with nowhere to go → the crown sits in constant moisture without air → fungi that prefer wet, poorly drained soil infect the soggy crown tissue and it turns soft, dark and mushy at the soil line.

Water in Crown

Best Match If

checkWater visibly pools where leaves meet the stem and stays damp for hours afterward
checkCentral leaves or the growing point turn brown-black and feel soft and mushy first, while outer leaves look better at first
checkYou water from above, mist the leaves, or splash water directly onto the crown
checkAir around the crown feels still and humid, and the crown does not dry during the day

Next Check

After watering, gently part the center leaves and feel where they meet the stem — if you still see pooled water or the tissue feels damp hours later, water in the crown is likely.

Why It Happens

When you let water sit in the crown where leaves meet the stem from overhead watering or misting, the tight center stays wet for an extended period → the damp soft tissue stays vulnerable and loses its defenses → fungi and bacteria colonize the wet crown and rot it from the inside out, so the center collapses and turns brown-black and mushy.

Buried Crown

Best Match If

checkCrown sits below the soil line with soil or mulch piled directly against the stem
checkPlant was repotted deeper than it was growing before, or soil was mounded up after watering
checkYou reused old potting mix, garden soil, or an unclean pot without cleaning
checkSmall wounds or soft dark spots at the soil line where soil rubs the stem

Next Check

Gently brush soil away from the base and see where the crown meets the soil — if the crown sits below the soil surface, this is likely the cause.

Why It Happens

When you bury the crown below the soil line, or you reuse old soil and unclean pots or tools that still carry fungal spores that can survive for years to decades as oospores, the buried damp tissue has direct contact with pathogens → spores like Phytophthora, Pythium and Fusarium germinate on the wet crown → the tissue decays at the soil line, spreads upward and downward, and may emit a foul smell as it rots.

Diagnostic Flow

Check these in order. If one answer lands on a likely conclusion, treat that as your stopping point before moving into the matching treatment.

What does the soil feel like 1 to 2 inches deep, a few days after your last watering?

If yesStill wet or damp to the touch

Soil that stays wet keeps the base airless — check next whether water can drain out freely.

If noDry or almost dry

Wet soil is less likely the driver — check next whether water is sitting in the center of the crown.

Not sureHard to tell if it's wet or dry

Lift the pot to feel its weight and compare a day after watering — heavy still means wet.

Does water drain freely from the pot when you water?

If noNo holes, or water pools on top and sits in the saucer for hours

Likely cause

Poor Drainage

Without an exit, water keeps the crown soaked and airless — move to a pot with holes and a lighter mix so the base can dry.

If yesWater flows out within about 30 seconds and the saucer empties quickly

Drainage looks okay — the soggy base is more likely from watering too often or water trapped in the center.

Not sureI haven't watched it drain closely

Watch the next watering: lift the inner pot out of the outer pot an hour later to see if water is still sitting underneath.

A few hours after watering, is there still water or damp tissue where the leaves meet the stem in the center?

If yesI see pooled water or the center still feels damp

Likely cause

Water in Crown

The tight center holds water for hours and softens the youngest tissue from the inside out — water at soil level and improve airflow so the crown can dry.

If noThe center dries quickly

Trapped water is less likely — check next whether the crown itself is sitting below the soil line.

Not sureI haven't checked the center after watering

Gently part the middle leaves a few hours after the next watering and touch where they join — pooled water means the center stays wet.

Is the crown sitting below the soil line, with soil or mulch piled against the stem?

If yesSoil is piled against the stem and the crown sits below the surface

Likely cause

Buried Crown

A buried base stays damp against soil that can carry fungal spores for years — gently uncover it so the crown sits just at the surface and use only fresh mix and a clean pot.

If noThe crown sits at or just above the soil surface and feels exposed to air

Likely cause

Overwatering

If the soil also stayed wet or damp in step 1, this pattern points to watering too often — let the top 1 to 2 inches dry before you water again; if the soil was already dry, review the common causes again for a less typical or mixed trigger.

Not sureI can't tell where the crown meets the soil

Brush soil away gently until you see where the stem widens at the base — if you have to dig to find it, it's likely buried.

Treatment

Start with safe stabilizing actions, then follow the plan that matches the diagnosed cause.

Safe while diagnosing

These low-risk actions help stabilize the plant before you know the exact cause.

checkMove the sick plant away from your other houseplants
checkKeep water off the crown while you check the cause
checkEmpty any water that sits in the saucer or outer pot after each watering — pour off any water that collects in saucers and do not let the pot sit in saucers or outer pots full of water

Treatment plan by cause

Overwatering

Use this plan if soil still feels wet or damp to the touch 1 to 2 inches deep many days after watering, or plant wilts even though the soil is still wet.

Today

Gently remove the plant from its pot and shake off the old, soggy soil so you can see the roots and crown
Rinse the roots with warm water to expose the crown and root condition
Trim away all soft, mushy, dark roots and crown tissue back to firm green tissue with clean scissors wiped with 70% alcohol between cuts
Repot in fresh, sterile, well-draining potting mix — do not reuse the old soil and avoid garden soil, using a mix with vermiculite or perlite for drainage
Put the plant in a clean pot with drainage holes, placing the root collar just at the soil surface only as deep as the root ball

Next a few weeks

Check the top 1 to 2 inches of soil every time before you water — if it is wet or damp to the touch wait to water; if it is dry down an inch or two then water
Water thoroughly so water comes out of the drainage holes, then empty the saucer after each watering
Check the crown for firmness and watch for new growth every few days over the next couple of weeks

What to expect

If the crown stays firm, you should see new growth over the next few weeks
Leaves that have already turned yellow, soft and mushy will not turn green again
If there is no improvement after a week or two, or the base turns more mushy and smells foul, pull and discard the plant promptly and sanitize the area — only take cuttings from healthy tissue and discard the pot and soil if the plant is too far gone

Don't do this

Well-meant fixes that can make the problem harder to diagnose.

Watering a wilting plant right away without feeling the soil first

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Excess water reduces oxygen in the soil, which damages fine roots and renders the plant unable to take up water, so a plant can wilt even when the soil is wet from crown rot. Adding more water keeps the soggy, airless base wet and lets the rot spread. Always check the top 1 to 2 inches — if it is wet or damp to the touch, wait to water and let it dry to the touch instead, and empty any saucer water.

Misting the leaves or pouring water into the crown to raise humidity

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Do not mist or wet the foliage during watering — it keeps leaves and the crown wet for extended periods, which favours fungi that thrive in warm, wet soil. Ensure free air circulation instead, water the soil at the base and keep water out of the crown, and water in the morning so the crown has time to dry during the day.

Pouring hydrogen peroxide into the living crown to 'sterilize' the rot

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Keep hydrogen peroxide for pots and tools only. Never pour it into a living crown — poured into a living crown, it oxidizes healthy cells and widens the wound rather than curing the infection. Instead, cut every soft, blackened, water-soaked patch back to firm green tissue and sterilize the blade between cuts, dusting the cut with cinnamon if you like, and keep the center dry.

Reusing old potting soil, garden soil, or an unclean pot to repot a sick plant

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Water mold root rot organisms such as Pythium and Phytophthora produce thick-walled spores (called oospores) that can survive for long periods (years to decades) in soil, and crown rot pathogens can persist in soil for years and spread through gardening tools. Only use clean or new pots for planting, avoid regular garden soil, and utilize a sterile potting media — always repot in fresh, sterile, well-draining mix and disinfect reused pots and tools for at least 30 seconds with a 10% bleach solution or 70% alcohol.