Phaseolus vulgaris Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is a mobile nutrient in Phaseolus vulgaris; when lacking, the plant redistributes nitrogen from older leaves to new growth, causing uniform yellowing (chlorosis) starting at the bottom of the plant.

Very Common

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How to confirm: Observe if the yellowing started on the oldest, lowest leaves while the top remains green.

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1 Apply a nitrogen-rich liquid fertilizer to provide immediate nutrient uptake for the developing leaves.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Incorporate an organic nitrogen source into the soil to ensure a sustained release of nutrients for future growth.

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

Organic Fertilizer

$40

Out of Stock

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Overwatering and Soil Saturated Conditions

Excessive moisture deprives bean roots of oxygen, leading to root hypoxia which inhibits nutrient uptake and causes leaves to turn pale yellow and eventually wilt.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it feels swampy or stays muddy for extended periods.

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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 Check the drainage of your container; if the soil remains saturated, repot the bean plant in a well-draining medium enriched with perlite to improve aeration.

3 Ensure the plant is in a pot with adequate drainage holes and use a saucer to catch excess water, but do not let the pot sit in standing water.

Bleuhome 10" Plant Saucer 6-Pack Black

Pot Saucers

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Bean Rust (Uromyces appendiculatus)

This fungal pathogen causes yellowing of leaves as a precursor to the appearance of small, reddish-brown pustules on the leaf surface.

Common

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How to confirm: Inspect the undersides of the yellowing leaves for tiny, raised brown spots or powdery pustules.

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1 Remove and destroy all heavily infected leaves immediately to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to the foliage to control the spread of the rust pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the bean plants and avoid overhead watering to keep the leaf surfaces dry, which discourages fungal growth.

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Magnesium Deficiency

A lack of magnesium causes interveinal chlorosis, where the leaf tissue turns yellow but the veins remain dark green, a common issue in acidic bean soils.

Common

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How to confirm: Check if the yellowing pattern is specifically trapped between the veins of the leaves.

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1 Apply a magnesium-rich supplement to the soil to correct the interveinal chlorosis.