Citrus limon Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is a mobile nutrient; when lacking, the tree relocates it from older leaves to new growth, causing uniform yellowing (chlorosis) of mature foliage.

Very Common

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How to confirm: Observe if the yellowing starts on the oldest, lowest leaves while newer leaves remain green.

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shopping_cart Recommended Products

1 Apply a nitrogen-rich organic fertilizer to replenish the soil nutrients and stop the yellowing of older leaves.

Back to the Roots Blood Meal & Gypsum (4 Pack)

Organic Fertilizer

$40

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2 Supplement with a balanced liquid fertilizer to ensure rapid nutrient uptake and support new green growth.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

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3 Monitor soil moisture levels using a moisture meter to ensure the nitrogen is being effectively transported to the roots.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Overwatering and Root Suffocation

Lemon trees are highly sensitive to 'wet feet.' Excess water displaces oxygen in the soil, leading to root rot which prevents the tree from transporting nutrients upward.

Very Common

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How to confirm: Stick your finger 2 inches into the soil to check for constant sogginess or a musty odor.

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shopping_cart Recommended Products

1 Immediately stop watering and allow the soil to dry out significantly to restore oxygen to the root zone.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the tree into a container with superior drainage and refresh the medium with a well-draining mix containing perlite to prevent future waterlogging.

3 Apply a liquid fertilizer containing essential micronutrients to help the tree recover from nutrient transport failure.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

$32

In Stock

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Iron Chlorosis

Common in alkaline soils, iron deficiency prevents chlorophyll production, specifically resulting in bright yellow leaves with dark green veins.

Common

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How to confirm: Look for a distinct pattern of 'interveinal chlorosis' where the veins remain dark green against a yellow background.

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shopping_cart Recommended Products

1 Apply an iron-rich supplement to the soil to correct the deficiency and restore chlorophyll production.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

In Stock

2 Check the soil pH to ensure it is in the acidic range (5.5–6.5), as alkaline soil prevents iron uptake.

YAMRON 4-in-1 Digital Soil Tester

Water Meters

$33

In Stock

3 Amend the existing soil with organic matter or a specialized citrus fertilizer to improve nutrient availability.

FoxFarm Happy Frog Citrus and Avocado Fertilizer

1 pcs • Organic

$21

In Stock

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Citrus Leafminer Damage

While primarily causing physical damage, the larvae tunneling through leaves can lead to localized necrosis and systemic stress that presents as yellowing.

Common

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How to confirm: Inspect the underside of leaves for silvery, serpentine trails left by larvae.

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shopping_cart Recommended Products

1 Inspect leaves for silvery trails and apply an organic insecticide to eliminate larvae and protect new growth.