Salix alba Yellow Leaves - Causes & Fixes

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Waterlogging and Root Hypoxia

While Salix alba is a riparian species that loves moisture, permanent saturation of the root zone can lead to anaerobic conditions. This prevents oxygen from reaching the roots, causing chlorophyll breakdown and yellowing (chlorosis) across the canopy.

Very Common

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How to confirm: Check if the soil around the base remains saturated even during dry periods or if there is standing water for extended durations.

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1 Immediately improve soil drainage by aerating the root zone or repotting into a more porous medium containing perlite to prevent further oxygen deprivation.

2 Check the soil moisture levels regularly using a moisture meter to ensure the root zone is not remaining permanently saturated.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Ensure the plant is in a container with adequate drainage holes and use a saucer to prevent water from pooling at the base.

Bleuhome 10" Plant Saucer 6-Pack Black

Pot Saucers

$20

In Stock

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Nitrogen Deficiency

Fast-growing trees like White Willow have high nutrient demands. A lack of available nitrogen in the soil prevents the synthesis of chlorophyll, resulting in a uniform yellowing of older leaves first.

Very Common

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How to confirm: Observe if the yellowing starts on older, lower leaves and spreads upward, and consider testing the soil nitrogen levels.

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1 Apply a nitrogen-rich organic fertilizer to the soil to boost chlorophyll production and address the deficiency.

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

Organic Fertilizer

$40

Out of Stock

2 Incorporate organic matter like worm castings into the root zone to provide a slow-release source of nitrogen.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor soil moisture levels to ensure nitrogen is being effectively transported to the roots without causing waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Iron Chlorosis

In high-pH (alkaline) soils, iron becomes chemically locked away from the tree. This prevents the development of chlorophyll, typically manifesting as yellow leaves with distinct green veins.

Common

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How to confirm: Inspect the leaves for a 'interveinal' pattern where the veins remain dark green while the rest of the leaf tissue turns bright yellow.

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shopping_cart Recommended Products

1 Apply an iron supplement or chelated iron to the soil to make iron available to the roots despite the high pH.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

In Stock

2 Amend the soil with organic matter or acidifying amendments to help lower the soil pH and unlock existing nutrients.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Monitor soil acidity and moisture levels regularly to ensure the tree is not experiencing secondary stress from drought or alkalinity.

GROWIT Analog Soil Moisture Meter

Water Meters

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Salix Leaf Rust (Melampsora)

Fungal pathogens like Melampsora can infect willow leaves, causing discoloration. While often presenting as orange pustules, the initial stages or severe infections can cause widespread leaf yellowing and premature drop.

Common

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How to confirm: Examine the undersides of the yellowed leaves for small, orange-to-brown powdery pustules.

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1 Remove and destroy all heavily infected or yellowing leaves to prevent the fungal spores from spreading to healthy foliage.

2 Apply an organic fungicide to the affected areas to control the spread of the Melampsoria pathogen.