Citrus hystrix Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Kaffir lime trees have high nutrient demands; a lack of nitrogen prevents the production of chlorophyll, causing older leaves to turn uniform pale yellow.

Very Common

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How to confirm: Observe if the yellowing starts on the oldest, bottom leaves while new growth remains green.

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shopping_cart Recommended Products

1 Apply a nitrogen-rich liquid fertilizer to boost chlorophyll production and green up the foliage.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Supplement the soil with a slow-release organic fertilizer to ensure long-term nutrient availability.

FoxFarm Happy Frog Citrus and Avocado Fertilizer

1 pcs • Organic

$21

In Stock

3 Monitor soil moisture levels with a meter to ensure the roots are healthy enough to absorb the new nutrients.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Overwatering and Root Hypoxia

Citrus hystrix is highly susceptible to root rot if the soil does not drain well. Excess water deprives roots of oxygen, leading to chlorosis (yellowing) throughout the canopy.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it remains saturated for long periods.

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shopping_cart Recommended Products

1 Immediately stop watering and allow the soil to dry out completely. Use a moisture meter to monitor the soil depth and ensure the root zone is not saturated.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the plant in a well-draining medium by mixing existing soil with perlite or horticultural grit to improve aeration and prevent future hypoxia.

3 Ensure the plant is in a container with excellent drainage and consider using a saucer to catch excess water, but never let the pot sit in standing water.

Bleuhome 10" Plant Saucer 6-Pack Black

Pot Saucers

$20

In Stock

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Iron Chlorosis

Common in alkaline soils, a lack of available iron prevents the plant from synthesizing chlorophyll, specifically affecting the leaf tissue.

Common

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How to confirm: Check if the veins of the leaves remain dark green while the interveinal areas turn bright yellow.

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shopping_cart Recommended Products

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

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

In Stock

2 Monitor soil pH levels to ensure the environment remains slightly acidic (5.5 to 6.5), as alkaline soil locks iron away from the roots.

YAMRON 4-in-1 Digital Soil Tester

Water Meters

$33

In Stock

3 Amend the existing potting medium with organic matter or acidifying amendments to improve nutrient availability.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

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Citrus Leafminer (Phyllonorycter citrella)

While primarily known for silvery trails, heavy infestations can cause leaf stress and premature yellowing/dropping of the distinctive double-lobed leaves.

Common

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How to confirm: Inspect the surface of the leaves for thin, winding silvery tracks or blotches.

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shopping_cart Recommended Products

1 Apply an organic insecticide to eliminate citrus leafminer larvae and protect new growth from infestation.