Salix discolor Yellow Leaves - Causes & Fixes

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Waterlogging and Root Hypoxia

Salix discolor thrives in moist soils, but prolonged saturation leads to anaerobic conditions. This prevents the roots from absorbing oxygen, causing a breakdown in chlorophyll production and resulting in overall yellowing of the foliage.

Very Common

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How to confirm: Check the soil depth around the root zone; if it remains muddy or waterlogged for several days after rain, drainage is likely insufficient.

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1 Immediately improve soil drainage by aerating the soil around the root zone or repotting into a more porous medium containing perlite.

2 Check the current moisture levels using a meter to ensure the soil is not remaining saturated for extended periods.

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

Willows are fast-growing species with high nutrient demands. A lack of available nitrogen prevents the synthesis of chlorophyll, typically manifesting as a uniform yellowing starting with older, lower leaves.

Very Common

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How to confirm: Observe if the yellowing follows a pattern from the bottom leaves upward and consider applying a balanced NPK fertilizer.

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1 Apply a nitrogen-rich liquid fertilizer to provide immediate nutrient uptake and help restore chlorophyll production.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Incorporate an organic soil amendment like worm castings into the soil 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 using a moisture meter to ensure the plant can effectively absorb the newly applied nutrients.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Salix Rust (Melampsora)

Fungal pathogens like rust can infect the leaves of Pussy Willows, causing chlorotic spots that eventually turn into yellow or orange pustules. This disrupts the leaf's photosynthetic capacity.

Common

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How to confirm: Inspect the undersides of the yellowing leaves for small, raised orange or brown fungal 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 Melampsora pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Ensure the plant is in a well-ventilated area and avoid overhead watering to keep the leaves dry, which discourages fungal growth.

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Drought Stress

Despite their preference for wet sites, extreme drought causes the plant to close stomata to conserve water, which can lead to leaf yellowing and eventual desiccation as the plant enters survival mode.

Common

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How to confirm: Check if the soil surface is cracked and if the yellowing is accompanied by crispy, brown leaf margins.

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shopping_cart Recommended Products

1 Check the soil moisture level at the root zone to confirm the extent of the drought stress.