What if laurel has yellow leaves: causes

Why do laurel leaves turn yellow?

Laurel (Prunus laurocerasus) is a tough, fast-growing hedge plant. But sometimes your laurel suddenly turns yellow instead of the familiar green. This is almost never a serious disease - it is almost always one of five common causes. The good news: once you know what is happening, it is easy to fix.

Yellow leaves on laurel can occur because your plant is receiving water when it does not need it, because it is stuck in poor soil, or because it simply needs some nutrition. Rarely is it anything serious.

Cause 1: Overwatering (most common)

The number one reason laurel turns yellow is too much water. This sounds odd - laurel likes moisture, right? Correct, but the roots need to breathe. Overwatering traps your roots in wet, oxygen-free soil. The roots cannot absorb water or nutrients, and your plant starts yellowing.

How you recognize overwatering:

• Yellow leaves, especially inside the hedge
• Leaves feel soft, almost mushy
• The soil under the hedge feels wet and heavy, even days after rain
• Sometimes a musty, swampy smell around the roots

How you fix it: Reduce watering drastically. If you have watered your hedge heavily, stop. Let the soil dry out between waterings. Laurel needs far less water than people think. In normal years, rainfall is enough. Only in dry summers do you need extra water.

Also check that your planting hole drains well. If your hedge sits in heavy clay soil, dig some holes around the hedge. This improves drainage.

Cause 2: Water shortage (drought)

Paradoxically, laurel can also turn yellow from too little water. This usually happens in extremely dry summers or in newly planted hedges that have not yet established roots.

How you recognize drought:

• Yellow leaves that curl and feel dry
• Soil is parched, hard as stone
• Plant sits in full sun (poor spot for laurel)
• Yellow starts at leaf edges

How you fix it: Water, but smartly. Give one large amount of water (not spraying), so it sinks deep. Repeat two weeks later if still dry. Add mulch around the hedge (5-10 cm compost) to retain moisture.

Cause 3: Poor nutrition (nitrogen deficiency)

Laurel grows fast and eats lots of nutrition. If you have never fed it, it can slowly develop nutrient deficiency. This shows as overall yellowing of young leaves.

How you recognize nutrient deficiency:

• Whole plant looks dull and yellowish, not bright green
• Especially young leaves at the tops are yellow
• Plant grows slowly or not at all
• No other obvious cause visible

How you fix it: Feed in April/May (spring). Laurel loves organic fertiliser or garden compost. Spread a 3-5 cm layer of compost around the hedge (not against the trunk). This tops up nutrition and helps with moisture retention.

If you want quick results, use a liquid nitrogen fertiliser (made especially for hedges). Two applications two weeks apart should turn your plant green.

Cause 4: Leaf fungus or disease

Sometimes yellow is not from water/nutrition shortage, but from fungal attack. This is much rarer than overwatering, but it happens.

How you recognize fungus:

• Yellow leaves with brown spots or black dots
• The spot has sharp edges with a halo
• Leaves fall off
• Usually on lower, wetter parts

How you fix it: Prune. Remove all affected leaves (really: all those sitting lower, in damper spots). This improves air circulation. Prune the hedge a bit wider than normal (cut more away than you think) so it becomes more open.

Rarely do you need fungicide. Better is to ensure better air by pruning and less water.

Cause 5: Winter or frost damage

If you see yellow leaves at the end of winter, it could be frost damage. Laurel is reasonably frost hardy, but severe winters or sudden frost waves can damage foliage.

How you recognize frost damage:

• Yellow/brown foliage usually on one side of the hedge (windward side)
• Damage visible in February/March
• Leaves curl and fall off
• Rest of plant stays green

How you fix it: Usually your laurel recovers on its own in spring. Remove severely damaged foliage (prune), but otherwise wait. New growth will replace this.

Frequently asked questions

Can I cut my yellow laurel right back?

Yes, and sometimes that is the best answer. Laurel regrows very fast from hard pruning. If more than 30-40% of your hedge is yellow, you might as well cut whole sections back to 30-50 cm. This stimulates new, healthy growth. Your hedge looks bad for months, but recovers fast.

How much water does laurel really need?

Far less than people think. After establishment (1-2 years), laurel only needs water in extremely dry periods. Generally: water when the top 5 cm of soil feels dry. In normal summers usually not needed.

Can I still feed my laurel in summer?

Yes, but carefully. Feeding in June is still okay, but July-August is late. This stimulates too much soft growth that can then suffer frost damage in autumn. Best: feed only in April/May.

How much compost should I add?

About 5-10 cm layer of compost around the hedge, not against the trunk. This provides nutrition, improves drainage and helps moisture retention. Repeat every year in March.

Step-by-step

Step 1: Determine the cause

Feel your soil. Is it wet? Overwatering. Is it dry? Drought. Does your plant look pale and limp? Nutrition. Quick check: see if your yellow foliage has brown spots (fungus) or normal drying.

Step 2: Fix the most likely cause

For overwatering: stop watering. For drought: thorough watering. For nutrition: add compost or spray liquid feed.

Step 3: Prune and clean

Remove severely yellow foliage (make your hedge more open if there is much). This always helps, whatever the cause.

Step 4: Monitor

In four weeks your plant should be much greener. If not, reconsider your diagnosis.

Frequently asked questions

My neighbour has the same hedge and it is not yellow. What am I doing differently?

Probably water. Neighbour does not water and prunes his hedge less. In our climate we get enough rain. Excessive help does more harm than good.

Can yellow laurel be permanently damaged?

No. Laurel recovers from almost anything. Even hard pruning right back to stumps leads to new growth. Exception: if your hedge is completely dead (only dry wood left), then replace. But that rarely happens.

Is there a fertiliser specially for laurel?

Not really. Normal garden fertiliser works fine. Laurel prefers organic matter (compost, manure) over artificial fertiliser. Simply add compost every year.

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