Common Houseplant Problems: Causes, Solutions & Expert Advice

Houseplants are surprisingly good at telling us when something is wrong. Yellow leaves, brown tips, black spots and drooping stems are all your plant's way of asking for help.

The good news is that most houseplant problems are caused by just a handful of issues. Once you understand what your plant is trying to tell you, they're often straightforward to fix.

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Yellow Leaves

One of the most common questions we hear in the shop is:

"Why are my plant leaves turning yellow?"

An occasional yellow lower leaf is usually nothing to worry about. Plants naturally shed older foliage as they grow.

If multiple leaves are turning yellow, however, there is usually an underlying cause.

Common causes of yellow leaves

Overwatering
Insufficient light
Cold temperatures
Natural ageing
Nutrient deficiencies

Top tip: overwatering is by far the most common cause of yellow leaves on houseplants.

If you're unsure whether your plant needs water, read our guide on how to water houseplants.

Brown Leaf Tips and Crispy Leaves

Brown leaf edges and crispy tips are particularly common on tropical plants such as Calatheas, Ferns and Begonias.

Common causes of brown leaves

Low humidity
Underwatering
Hot radiators
Cold draughts
Direct sunlight scorching the foliage

Most houseplants originate from tropical environments where humidity levels are much higher than the average UK home.

Moving plants away from radiators, increasing humidity and keeping watering consistent can often solve the problem.

Worth knowing: once a leaf has turned brown, the damaged area will not recover, although new growth should be healthy once conditions improve.

Black Spots on Leaves

Black or dark brown spots often indicate excess moisture.

If the spots are soft, dark and surrounded by a yellow halo, overwatering is usually the culprit.

Check the roots

If you suspect overwatering, gently remove the plant from its pot and inspect the roots.

Healthy roots: firm, creamy white or pale yellow
Rotten roots: brown, black, mushy or foul smelling

If root rot is present, trim away the affected roots with clean scissors and repot into fresh, free-draining compost.

Curling Leaves

Curling leaves are often a sign that your plant is stressed.

Common causes include:

Cold temperatures
Draughts
Underwatering
Excessive heat
Low humidity

Many tropical houseplants dislike sudden changes in temperature. Keep them away from open windows, external doors and cold spots during winter.

Dropping Leaves

Leaf drop can look alarming, but it is often your plant reacting to changes in its environment.

Ficus plants are particularly famous for dropping leaves after being moved.

Common causes of leaf drop

Overwatering
Cold draughts
Sudden temperature changes
Moving the plant
Insufficient light

If your plant has recently been moved, give it time to adjust before making further changes.

Slow Growth

Sometimes customers worry because their plant simply isn't growing.

Before panicking, remember that most houseplants slow down significantly during autumn and winter.

Plants require warmth, light and energy to grow. During the darker months they naturally conserve resources.

If your plant is healthy but growing slowly between October and March, this is often completely normal.

Pests

Houseplant pests are more common than many people realise.

The most common offenders include:

Thrips
Spider mites
Mealybugs
Scale insects
Aphids
Fungus gnats

If you spot pests, isolate the plant immediately and begin treatment as soon as possible.

For a detailed breakdown of each pest and how to treat them, read our guide to common houseplant pests.

We often recommend SB Invigorator Spray as part of a regular plant care routine.

Winter Problems

Winter can be one of the toughest times of year for houseplants.

Common winter challenges include:

Lower light levels
Cold windowsills
Dry air from central heating
Overwatering during dormancy

During winter, most houseplants require less water and less feeding than they do during spring and summer.

Top tip: always adjust your watering routine as the seasons change.

When Should You Repot?

If your plant is struggling despite good care, it may have outgrown its pot.

Signs that a plant may need repotting include:

Roots growing from drainage holes
Water running straight through the pot
Roots circling heavily inside the pot
Very slow growth during the growing season

Most houseplants are best repotted during spring and summer.

Read our full guide to repotting houseplants for more information.

Frequently Asked Questions

Why are my houseplant leaves turning yellow?

Overwatering is the most common cause, although low light, cold temperatures and natural ageing can also be responsible.

Why are the tips of my leaves turning brown?

Brown tips are often caused by low humidity, inconsistent watering or dry air from radiators.

Why is my plant dropping leaves?

Leaf drop is commonly caused by overwatering, temperature fluctuations, cold draughts or changes in light levels.

How do I know if my plant has root rot?

Healthy roots are firm and pale coloured. Rotten roots are usually brown, black, mushy and may smell unpleasant.

Can a dying plant recover?

Often yes. If the roots and growing points are still healthy, improving the growing conditions can allow many plants to recover.

Your Houseplant Troubleshooting Checklist

Check watering first
Assess light levels
Inspect for pests
Look for draughts or temperature issues
Check root health
Consider whether the plant needs repotting
Remember that growth slows naturally in winter

Don't Panic

Every plant owner loses a plant occasionally. Even experienced growers get things wrong from time to time.

The important thing is to learn from the experience and understand what your plant is trying to tell you.

With the right care, most common houseplant problems can be identified early and successfully resolved.