10 Reasons Your Dracaena is Turning Yellow & How to Fix it

Dracaena leaves turn yellow most commonly because of overwatering combined with poor drainage, which prevents roots from receiving oxygen and triggers rot.

Other causes include fluoride toxicity from tap water, natural leaf ageing, low humidity, direct sun exposure, sudden temperature changes, salt buildup from fertilizer, insufficient light, and pest infestation.

The most important diagnostic step is to look at where the yellowing is occurring on the plant, because the location and pattern of yellow leaves tells you more about the cause than almost any other single observation.

The most frustrating thing about a dracaena with yellow leaves is that nearly every article on the topic tells you overwatering is the problem. Sometimes it is.

But I have seen dracaenas with yellow leaves that were bone-dry, plants yellowing from fluoride that had never been overwatered, and plants dropping lower leaves that were perfectly healthy.

The advice to water less is the right fix for one cause and actively wrong for several others.

This guide is structured around diagnosis first, not treatment first.

If you can identify which of the ten causes applies to your plant based on what the yellowing actually looks like and where it is, you will fix the right problem on the first attempt instead of making three changes and not knowing which one helped.

The Diagnostic Framework: Start Here Before Anything Else

Before running through each cause, spend 60 seconds answering these three questions. The answers will narrow your diagnosis significantly and point you toward the correct section of this guide.

Question 1: Where on the plant are the yellow leaves? Lower leaves only, or throughout the plant?

Lower leaves yellowing while upper leaves stay green almost always means either natural ageing or overwatering.

If it is natural ageing, the yellowing progresses slowly and only the oldest bottom leaves are affected while the plant continues producing healthy new growth from the top.

If it is overwatering, the yellowing spreads upward over time and the leaves feel limp and soft rather than just pale.

Yellowing throughout the plant, affecting both old and new leaves, is more serious.

This typically points to root rot that has progressed significantly, severe pest infestation, or a major environmental stressor like sudden temperature shock or complete root failure.

Question 2: What do the yellow leaves look like? Uniform pale yellow, or spotted and patchy?

Uniform pale yellowing with soft, drooping leaves points toward overwatering and root oxygen deprivation.

Yellowing that starts specifically at the tips and edges while the leaf centre stays green for a while longer points toward fluoride toxicity, low humidity, or salt buildup.

Irregular yellow spots with brown patches or a yellow halo around dark centres point toward fungal leaf spot disease.

Yellow bands across the full width of a leaf with no other pattern can indicate cold temperature exposure.

Question 3: Is the plant producing new growth from the top?

If the plant is actively pushing out new leaves from the top while lower leaves yellow and drop, this is almost certainly natural ageing or early-stage overwatering that has not yet reached the roots.

If the plant has stopped producing new growth entirely and is yellowing throughout, the problem is more significant and likely involves roots.

Cause 1: Natural Ageing (The Most Overlooked Explanation)

Before assuming something is wrong, consider whether your dracaena is doing exactly what a healthy dracaena does.

Dracaena naturally sheds its lower leaves as they age, and this natural turnover is the most commonly misdiagnosed cause of yellowing in this genus.

I cannot count the number of times I have told someone their plant is fine when they were convinced it was dying.

Lower leaves have a limited lifespan regardless of how perfect the care conditions are. As the plant grows taller, older leaves at the bottom fade from green to pale green to yellow before dropping.

This is the plant’s normal process of directing energy toward new growth at the top.

A dracaena that is actively producing fresh green leaves from its crown while simultaneously dropping yellow lower leaves is not a sick plant. It is a healthy plant doing what dracaenas do.

The way to confirm natural ageing: look at the top of the plant. If there are new, firm, green leaves emerging from the growing tip, and the yellowing is confined entirely to the lowest, oldest leaves, no intervention is needed.

Simply remove the yellowed leaves cleanly by pulling them gently downward from the stem, or cut them off close to the trunk with clean scissors.

Cause 2: Overwatering (The Most Common Actual Problem)

Overwatering is genuinely the most common cause of dracaena yellowing in home settings, but it is important to understand what overwatering actually means. It does not just mean watering too often.

It means the roots are sitting in saturated, oxygen-depleted soil for extended periods, whether because you watered too frequently, the soil is too dense and does not drain adequately, the pot lacks drainage holes, or water is pooling in the saucer underneath the pot.

Dracaena roots need oxygen as much as they need water.

In saturated soil, oxygen cannot reach the roots, and they begin to suffocate and decay within 48 hours of continuous waterlogging.

Once root rot sets in, the plant cannot absorb water or nutrients even when they are available. This is why an overwatered dracaena looks dehydrated: the roots are no longer functional.

How to Identify Overwatering

The yellowing starts on lower, older leaves and is soft and limp rather than dry and crisp. The leaves lose their semi-rigid bearing and droop downward.

Yellow-brown spots may develop across the leaf surface. If you squeeze a yellowed leaf, it feels waterlogged rather than papery.

Confirming the problem: push a wooden chopstick or your finger 2 inches into the soil near the root zone.

Not at the surface and not at the pot edge, but near the centre of the root ball where moisture persists longest.

If the soil feels cool, damp, or has dark material clinging to the chopstick after several days since you last watered, the soil is too wet for dracaena.

If it smells sour or musty, anaerobic bacterial activity has already begun.

How to Fix Overwatering

• Stop watering immediately and allow the soil to dry completely before considering the next watering.
• Empty any saucer or tray under the pot. A dracaena sitting in pooled water is continuously waterlogged at the root base regardless of how infrequently you water from above.
• Move the plant to a warmer, brighter spot to accelerate drying if possible.
• If the plant has been consistently wet for weeks, remove it from its pot and inspect the roots. Healthy dracaena roots are firm, white to light tan, and pliant. Rotten roots are brown to black, soft, mushy, and often smell unpleasant. Cut all rotten material away to clean white tissue using sterile scissors.
• Repot into fresh, well-draining mix. A good dracaena soil contains 1 part perlite or coarse grit to every 3 parts potting compost. Avoid moisture-retention mixes.
• Going forward: water only when the top 2 inches of soil are dry. Check this with a finger or chopstick at depth, not by looking at the surface.

Cause 3: Fluoride Toxicity (The Most Misdiagnosed Problem)

Fluoride toxicity is consistently one of the most common causes of dracaena leaf problems and one of the most consistently misidentified.

It is frequently blamed on underwatering or low humidity when the actual cause is the accumulation of fluoride ions from tap water in the leaf tissue over time.

Dracaena is classified as a fluoride hyperaccumulator, meaning it absorbs and concentrates fluoride from the soil in its leaf tissue at levels that would not affect most other plants.

Even at the 0.7 parts per million fluoride concentration recommended by public health guidelines for US drinking water, dracaena can develop toxicity symptoms with prolonged exposure.

The fluoride accumulates in the older, outer leaf tissue where it disrupts cell wall integrity and prevents photosynthesis.

How to Identify Fluoride Toxicity vs Overwatering

This is the most important diagnostic distinction in dracaena care, and most guides do not explain it clearly. The pattern is different.

Fluoride toxicity produces yellowing and browning that starts at the tips and edges of leaves, not at the centre or base.

The tip and leaf margin turn yellow and then progress to brown and dry while the central part of the leaf may remain green for weeks.

The affected tissue dries out rather than becoming limp and waterlogged.

Overwatering produces whole-leaf yellowing with soft, drooping leaves. Fluoride toxicity produces tip and edge yellowing with the rest of the leaf initially staying firm and green.

A useful additional check: look at which leaves are affected. Fluoride accumulates in older leaf tissue, so fluoride toxicity tends to affect older and outer leaves first while very young new growth often looks healthy.

The tips of affected leaves develop a clear progression from yellow to orange-brown to dry necrotic tissue moving inward from the margin.

How to Fix Fluoride Toxicity

• Switch to rainwater, distilled water, or filtered water (using a carbon filter that removes fluoride). This is the primary fix and the only way to stop further damage.
• If filtered or rainwater is not practical, fill a watering can with tap water and leave it uncovered for 24 hours. This allows chlorine to dissipate but does not remove fluoride. It is a partial improvement, not a complete solution for fluoride-sensitive plants.
• Flush the soil thoroughly with clean water to leach accumulated fluoride salts from the root zone. Water heavily until water runs freely from the drainage holes, allow to drain completely, and repeat two to three times over a few days.
• Avoid fertilizers containing superphosphates, which contain high levels of fluorine and compound the problem. Use a balanced liquid fertilizer specifically for indoor plants and apply at half the label-recommended strength.
• The browning and yellowing that has already occurred will not reverse. Trim affected leaf tips and edges cleanly at a slight angle using sharp scissors, cutting into healthy green tissue by about 3 to 5 millimetres. This stops the appearance of damage progressing but does not harm the underlying leaf tissue.

Cause 4: Low Humidity and Dry Air

Dracaena originates from tropical and subtropical environments with ambient humidity levels well above what most US homes provide, particularly in winter when forced-air heating runs continuously.

The plant prefers humidity between 40 and 60 percent. When ambient humidity drops below 30 to 35 percent, the plant begins to lose moisture through its leaves faster than the roots can supply, and the leaf tissue at the tips and margins, which are furthest from the water-supplying vascular system, shows signs of stress first.

The symptom pattern: leaf tips and edges turn brown and crispy, then progress to a yellowed zone just inside the brown area.

New leaves may emerge with brown tips even before they are fully developed. The plant as a whole looks dry rather than limp, and the soil moisture is usually fine.

This overlaps in appearance with fluoride toxicity, which is why both causes need to be considered together.

The distinction is timeline and water source. If you have recently changed from tap water to distilled and the browning continues, low humidity is the more likely ongoing cause.

If you are still using tap water, fluoride remains the suspect.

How to Fix Low Humidity

• Place the pot on a pebble tray filled with water, ensuring the base of the pot sits above the waterline rather than in it. As water evaporates from the tray, it raises humidity immediately around the plant.
• Group the dracaena with other plants. The combined transpiration of several plants creates a microclimate of higher humidity around all of them.
• Use a small humidifier in the room during heating season. This is the most effective single method for raising ambient humidity significantly.
• Keep the plant away from heating vents, radiators, and forced-air registers, which direct dry, hot air directly at the foliage.
• Misting the leaves periodically has minimal effect on ambient humidity because the water evaporates within minutes. It is not harmful but it does not meaningfully address the underlying low-humidity problem.

Cause 5: Direct Sunlight

Dracaena is a shade-tolerant understory plant in its native tropical habitat and its leaves are adapted to filtered light, not direct sun.

Full direct sunlight, particularly the intense afternoon sun through a south or west-facing window in summer, causes the leaf surface to scorch.

The scorching appears as yellow patches, bleached streaks, or brown dry areas that develop rapidly, sometimes within a few days of exposure.

The pattern is typically irregular and occurs across multiple leaves simultaneously rather than progressing from lower to upper leaves like overwatering does.

The affected areas are dry and crispy from the moment they appear rather than starting soft and becoming dry over time.

The fix is straightforward: move the plant away from direct sun exposure.

Dracaena does best in bright indirect light, meaning a position that receives strong ambient light from a nearby window without direct sun rays touching the leaves.

A position 3 to 8 feet from a bright window, or directly in front of a window that has a sheer curtain filtering direct rays, works well.

Once scorching has occurred, the affected leaf tissue will not recover, but the plant will grow new leaves normally once the light condition is corrected.

Cause 6: Insufficient Light

While dracaena tolerates lower light than most flowering plants, it does not thrive in genuine low-light conditions and will show signs of stress if kept too far from any natural light source.

The yellowing from insufficient light is a general, uniform paleness across the plant rather than the tip-and-edge pattern of fluoride toxicity or the limp whole-leaf yellowing of overwatering.

The leaves lose vibrancy and become washed-out and pale. Growth slows or stops. Stems may stretch toward available light.

Dracaena performs well in bright indirect light and tolerates medium indirect light reasonably well. It manages in low light but loses colour intensity and may eventually decline.

A completely windowless room with only fluorescent lighting is below the minimum for long-term health unless the artificial light provides sufficient intensity for at least 12 hours daily.

Cause 7: Sudden Temperature Changes and Cold Exposure

Dracaena is a tropical plant that performs best in stable temperatures between 65 and 80 degrees F.

It is sensitive to sudden temperature changes in either direction and particularly intolerant of cold draughts, temperatures below 55 degrees F for sustained periods, and cold air directed onto the foliage from air conditioning vents.

Cold exposure produces a distinctive symptom: yellow or brown bands that run across the full width of leaves, perpendicular to the central vein, in a pattern that looks as if a stripe of the leaf was killed at one moment in time.

This banding pattern is highly characteristic of cold damage and differs clearly from the tip browning of fluoride toxicity or the whole-leaf yellowing of overwatering.

Common sources of cold exposure that are easy to overlook: placing the plant near an exterior door that opens to cold outside air in winter, leaving it near a window that is regularly opened in cold weather, positioning it directly below an air conditioning vent that blows cold air onto the foliage, or placing it against an exterior wall in a room that drops below 55 degrees F at night.

The fix is repositioning. Move the plant away from the cold source and maintain stable temperatures.

The damaged leaves will not recover, but new growth from the top will come in healthy once temperatures are stable.

Cause 8: Salt Buildup from Fertilizer and Poor Water

Over time, dissolved mineral salts from fertilizer and tap water accumulate in the soil. Dracaena is more sensitive to salt buildup than many other common houseplants.

Excessive salt concentration in the soil draws water out of root cells by osmosis, a process called physiological drought, where the roots cannot absorb water even when the soil appears moist.

The symptoms overlap with underwatering: yellowing, leaf edge browning, and general decline despite adequate soil moisture.

White or pale grey deposits visible on the soil surface or on the outside of a terracotta pot near the soil line indicate salt accumulation. This is the most reliable visual sign.

Fertilizers containing superphosphates are a specific risk for dracaena because superphosphates have high fluorine content, compounding the fluoride toxicity risk described in Cause 3 above.

Perlite in some potting mixes also contains superphosphates.

This is why the original article’s recommendation to use perlite-containing mixes needs a caveat: perlite improves drainage beneficially but some formulations add to fluoride load.

How to Fix Salt Buildup

• Flush the soil by watering heavily and repeatedly over 2 to 3 days, allowing large volumes of water to pass through the drainage holes and carry dissolved salts out with it.
• If flushing does not resolve the problem within 2 weeks, repot into fresh soil. Choose a potting mix without superphosphates or excessive perlite, and use distilled or rainwater going forward.
• Reduce fertilizing frequency. For indoor dracaena, fertilizing once every 6 to 8 weeks during the growing season at half the label-recommended strength is sufficient. Never fertilize during autumn and winter when the plant’s growth slows.
• Use a balanced liquid fertilizer rather than granular or slow-release formulas, which are harder to adjust if salt buildup occurs.

Cause 9: Pest Infestation

Dracaena is relatively pest-resistant but becomes susceptible to spider mites, mealybugs, and scale insects when it is weakened by other stressors like chronic overwatering, low humidity, or poor drainage.

The pests feed by piercing leaf tissue and extracting sap, which causes the affected leaves to yellow, mottle, or develop stippled patterns.

Spider Mites

Spider mites are the most common pest affecting indoor dracaena in dry conditions.

They are nearly invisible to the naked eye but leave distinctive signs: fine webbing on the underside of leaves and between stems, and a stippled, dusty, or bronze appearance on the upper leaf surface where individual cells have been emptied of content.

The stippling looks like the leaf has been sprayed with very fine brown dots. In significant infestations the plant yellows overall and looks generally unhealthy.

Treatment: isolate the plant immediately to prevent spread. Move it outdoors if weather permits and spray forcefully with water to dislodge mites.

Apply neem oil spray to all leaf surfaces, upper and lower, every 5 to 7 days for 3 to 4 applications. Increasing humidity around the plant makes conditions significantly less hospitable for mites.

Mealybugs

Mealybugs appear as small white cottony masses in the joints where leaves meet stems and in any other sheltered crevice on the plant.

They move slowly and are easy to see once you know what to look for. They excrete honeydew, a sticky substance, which may attract sooty mould on the leaf surface.

Treatment: wipe accessible colonies with a cotton ball soaked in 70 percent isopropyl alcohol.

Follow up with neem oil or insecticidal soap spray applied to the whole plant every 7 days for 3 to 4 weeks. Mealybugs have an egg cycle that requires repeat treatments to interrupt.

Scale Insects

Scale insects appear as small, fixed brown or tan bumps along stems and on the undersides of leaves.

Unlike mealybugs, which are soft-bodied, scale insects protect themselves under a hard shell and are resistant to contact sprays that do not penetrate the shell.

Horticultural oil applied in thorough coverage smothers the insects under their shells and is the most reliable treatment. Prune out and dispose of heavily infested branches.

Cause 10: Fungal and Bacterial Disease

Fungal and bacterial infections are the least common cause of dracaena yellowing in indoor settings but are worth knowing about because they can be mistaken for other causes and the fixes are different.

Fusarium Leaf Spot

Caused by the fungal pathogen Phoma draconis, fusarium leaf spot produces irregular yellow spots that develop on lower, older leaves first.

As the disease progresses, the spots turn brown and necrotic with a characteristic purple margin and sometimes develop a yellow halo around the dead tissue.

In advanced cases, small black dots may appear within the brown areas: these are the fungal fruiting bodies (pycnidia) and confirm the diagnosis.

Fusarium leaf spot thrives when foliage is kept wet through overhead watering or when the plant is kept in humid, poorly ventilated conditions.

Prevention is straightforward: always water at soil level rather than over the leaves, improve air circulation around dense plantings, and avoid overcrowding.

Treatment: remove all affected leaves and dispose of them away from other plants.

Apply a copper-based fungicide or a fungicide labelled for leaf spot diseases according to product instructions.

Do not let the plant sit in conditions that favour fungal spread. Improve air circulation.

Soft Rot

Soft rot is a bacterial disease that causes the lower stem and base of the plant to become water-soaked, mushy, and foul-smelling.

Lower leaves collapse and the stem becomes discoloured and soft.

Unlike root rot from overwatering, which affects the roots and works upward slowly, soft rot can progress very rapidly once established.

Soft rot at the base of the main stem cannot be cured: the plant should be disposed of rather than attempting treatment.

If the rot is confined to a lateral branch or offshoot that can be pruned away cleanly 6 to 8 inches below visible symptoms, that pruned portion can be saved. Sterilize all cutting tools with 70 percent isopropyl alcohol between cuts.

Diagnosing Your Dracaena: A Step-by-Step Process

If you are still uncertain after working through the sections above, follow this sequence:

1. Look at where the yellowing is. Bottom leaves only with healthy top growth: likely natural ageing or early overwatering. Tips and edges with firm leaves: likely fluoride or low humidity. Throughout the plant, all ages of leaves: likely severe overwatering with root damage, or a significant environmental shock.
2. Check the soil at depth. Push a chopstick or finger 2 inches down near the root zone. Damp or cool: possible overwatering. Completely dry and crumbly: possible underwatering or dry-air stress. Foul-smelling: root rot is likely established.
3. Examine the underside of leaves with a magnifying glass or phone camera. Fine webbing, dust, or moving specks: spider mites. White cottony masses: mealybugs. Fixed brown bumps: scale.
4. Consider your water source. Using tap water and seeing tip and edge browning that does not respond to increased watering or humidity? Fluoride toxicity is the likely cause.
5. Check for cold or heat sources. Has the plant recently been near an open window, a heating vent, or an air conditioning unit? Cold banding or heat scorch may be the cause.
6. Ask whether anything has recently changed. Moved the plant to a different room? Changed the watering schedule? Started a new fertilizer? Most plant problems follow a change in conditions.

Recovery Timeline: What to Expect After You Fix the Problem

Troubleshooting Reference Table

Frequently Asked Questions

Why are my dracaena’s lower leaves turning yellow?

Lower leaf yellowing is the most common complaint about dracaena and is often nothing to worry about.

If your plant is producing healthy new green leaves from the top while older leaves at the bottom yellow and drop, this is natural ageing and no intervention is needed.

If the yellowing is spreading upward to include middle and upper leaves, and the leaves feel soft and limp rather than just pale, overwatering is the more likely cause.

Check soil moisture at 2-inch depth to distinguish between the two.

Should I remove yellow dracaena leaves?

Yes, once a leaf has fully yellowed it will not recover, and leaving it on the plant adds no benefit.

Remove yellow leaves by pulling them gently downward along the stem, which is how they naturally detach, or cut them off close to the trunk with clean scissors.

Removing yellow leaves improves the appearance of the plant and allows you to assess whether new yellowing is developing.

Do not remove leaves that are only partially yellow unless they are clearly dying: some partially yellowed leaves can partially recover if the underlying problem is fixed early.

Can a yellow dracaena leaf turn green again?

In most cases, no. Once chlorophyll has been broken down and leaf tissue has lost its green colour, the process is not reversible in the affected tissue.

However, a leaf that is very slightly pale or washed-out rather than fully yellow may recover some colour if the underlying problem, usually insufficient light or mild nutrient deficiency, is corrected quickly.

A leaf that has turned distinctly yellow will not turn green. The goal of treatment is to prevent further yellowing, not to reverse existing damage.

Why are my dracaena leaf tips turning brown?

Brown leaf tips that begin at the tip and progress inward along the edges while the centre of the leaf stays green are almost always caused by one of two things: fluoride accumulation from tap water, or low humidity.

These two causes produce almost identical-looking symptoms. The way to distinguish them is to consider your water source and the humidity level in your home.

If you use tap water and the humidity is adequate, fluoride is the more likely cause. If you use filtered water but the humidity is low, humidity stress is more likely.

Trim affected tips with sharp scissors cutting into healthy tissue and address the underlying cause.

How often should I water my dracaena?

Dracaena should be watered when the top 2 inches of soil have dried out completely.

This is not a fixed schedule because the drying rate changes with seasons, light levels, pot size, soil composition, and room humidity.

In summer in bright indirect light, this may be every 7 to 10 days. In winter in lower light, it may be every 2 to 3 weeks.

The reliable way to know is to check the soil at depth before every watering rather than following a calendar.

When you do water, soak the soil thoroughly until water drains freely from the drainage holes, then do not water again until the soil has dried to 2 inches depth.

Is my dracaena toxic to my cat?

Yes. All species in the Dracaena genus are listed as toxic to cats and dogs by the ASPCA. The plant contains saponins that cause vomiting, drooling, loss of appetite, and lethargy in pets.

Cats specifically may have dilated pupils after ingestion. The plant is not usually fatal but causes real distress and warrants immediate veterinary contact if ingestion is suspected.

Keep dracaena out of reach of pets that chew plants, and contact the ASPCA Animal Poison Control Center at (888) 426-4435 if your pet has ingested any part of the plant.

Why has my dracaena stopped growing?

Dracaena growth naturally slows or stops in winter when light levels drop and the plant enters a semi-dormant state.

This is normal and does not indicate a problem. If growth has stopped during spring or summer, the most likely causes are insufficient light, root crowding in a pot that has become too small, depletion of nutrients in soil that has not been refreshed for several years, or waterlogging that has damaged the root system.

Assess each factor in sequence and address the most likely one first.

Key Takeaways

1. Use the yellow leaf pattern to diagnose the cause before making any changes. Where the yellowing occurs and what the affected leaves look like tells you more than anything else about the underlying problem.
2. Natural ageing of lower leaves is normal. If new growth is emerging from the top while only the oldest bottom leaves yellow and drop, no intervention is needed.
3. Overwatering and fluoride toxicity are the two most common causes after natural ageing, and they produce different symptoms. Overwatering causes soft, limp whole-leaf yellowing. Fluoride toxicity causes firm-leaved tip and edge yellowing.
4. Always check soil moisture at 2-inch depth, not at the surface. The surface dries much faster than the root zone and surface checks are unreliable.
5. Dracaena must have a pot with drainage holes. Without drainage, root rot is inevitable regardless of how carefully you water.
6. If you use tap water and your dracaena has persistent brown-yellow tips on otherwise healthy leaves, switch to distilled or rainwater. Fluoride accumulation is a biochemical reaction specific to this genus and cannot be managed through watering technique alone.
7. Yellowed leaves will not turn green again. Successful treatment means no new yellowing develops, not that existing yellow leaves recover.
8. All dracaena species are toxic to cats and dogs. Contact a veterinarian immediately if a pet ingests any part of the plant.
9. When in doubt, wait. Most dracaena owners cause more harm by over-responding to yellowing with multiple simultaneous changes than by being patient and methodical. Fix one suspected cause, observe for 2 to 3 weeks, and assess before making another change.

Final Thoughts

Dracaena is one of the most forgiving houseplants you can grow, and most cases of yellowing are fixable if you diagnose the correct cause before acting.

The biggest mistake I see repeatedly is people watering less because they read that overwatering causes yellowing, when their plant is actually struggling with fluoride, or low humidity, or simply getting old in the way all dracaenas eventually do.

Look at the pattern. Check the soil at depth. Consider the water source. Ask whether anything changed recently.

Those four steps will take you to the right answer in the large majority of cases without trial and error.

The dracaena on my desk has been dropping lower leaves on and off for two years.

Every time a new leaf yellows near the bottom I check: is new growth emerging from the top? Yes. Is the soil at depth dry when I go to water? Yes. Is it only lower leaves? Yes.

Every time the answer is natural ageing. Every time I do nothing, and every time the plant is fine.