Citrus grandis Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is a mobile nutrient in Pomelo trees; when deficient, the plant reallocates nitrogen from older leaves to new growth, causing uniform yellowing of older foliage.

Very Common

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

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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

Out of Stock

2 Supplement with a liquid seaweed fertilizer to boost nutrient uptake and support vigorous new growth.

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

0.9 L • 1 pcs

$32

In Stock

3 Ensure the soil is well-draining to prevent nitrogen leaching, potentially adding perlite to improve aeration.

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Overwatering and Root Hypoxia

Citrus grandis requires well-draining soil; excessive moisture saturates the root zone, displacing oxygen and causing root suffocation which manifests as leaf chlorosis.

Very Common

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How to confirm: Check if the soil is waterlogged or if there is a distinct malodorous smell coming from the root zone.

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1 Immediately reduce watering frequency and ensure the plant is in a container with excellent drainage to allow the root zone to dry out.

2 Repot the plant into a well-draining medium by mixing in horticultural perlite to improve aeration and prevent future oxygen displacement.

3 Monitor soil moisture levels closely using an analog meter to ensure you only water when the top inch of soil is dry.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Iron Chlorosis (pH Imbalance)

In high pH (alkaline) soils, iron becomes chemically unavailable to the Pomelo tree, preventing chlorophyll synthesis in developing leaves.

Common

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How to confirm: Look for bright yellow leaves with very distinct, dark green veins (interveinal chlorosis).

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1 Test your soil pH immediately to confirm alkalinity; for Pomelo, you want to maintain a slightly acidic range between 5.5 and 6.5 to ensure iron availability.

YAMRON 4-in-1 Digital Soil Tester

Water Meters

$33

In Stock

2 Apply an organic iron supplement or acidifying amendment to lower the soil pH and unlock trapped nutrients.

FoxFarm Bush Doctor Cal Mag Liquid Fertilizer 1 Gallon

3.8 L • Organic

$88

In Stock

3 Amend the soil with organic matter like compost or peat moss to help buffer the pH and improve nutrient uptake.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

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Citrus Leafminer Infestation

Larvae of the leafminer moth tunnel through the leaf tissue, disrupting nutrient transport and causing localized or widespread yellowing and leaf distortion.

Common

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How to confirm: Inspect the underside of leaves for silvery, serpentine tracks or tunnels within the leaf blade.

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1 Apply an organic insecticide spray to eliminate larvae and protect new growth from further tunneling.