Pisum sativum Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is a mobile nutrient; when deficient, the plant moves nitrogen from older leaves to new growth, causing uniform yellowing (chlorosis) starting with the bottom leaves. This is common in peas as they rapidly consume soil nitrogen during early vegetative stages.

Very Common

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How to confirm: Check if the yellowing started on the oldest, lowest leaves first 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 Incorporate organic worm castings into the top layer of the soil to provide a slow-release source of nitrogen and beneficial microbes.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor the soil moisture levels to ensure the 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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Overwatering and Poor Drainage

Excessive moisture displaces oxygen in the soil, suffocating the pea roots and leading to root rot. This prevents the plant from transporting essential nutrients, resulting in overall leaf yellowing and wilting.

Very Common

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How to confirm: Press your finger deep into the soil; if it feels muddy or water pools when poked, drainage is likely the issue.

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1 Immediately reduce watering frequency and allow the top inch of soil to dry out completely before watering again.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the plant into a container with superior drainage and mix in horticultural perlite to improve soil aeration and prevent future waterlogging.

3 Ensure the plant is placed in a saucer to catch excess water, but empty the saucer after use to prevent the roots from sitting in stagnant water.

Bleuhome 10" Plant Saucer 6-Pack Black

Pot Saucers

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Ascochyta Blight (Ascochyta pisci)

This fungal pathogen causes chlorotic (yellow) spots on leaves that eventually turn into necrotic lesions. It thrives in cool, wet conditions typical of the growing season for Pisum sativum.

Common

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How to confirm: Inspect the yellow areas for small, dark brown, sunken spots or concentric rings.

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1 Remove and destroy all infected leaves and plant debris immediately to prevent the fungal spores from spreading to healthy tissue.

2 Apply an organic fungicide to control the spread of the blight and protect remaining healthy foliage.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plants and avoid overhead watering to ensure leaves stay dry, reducing the moist conditions the pathogen thrives in.

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Iron Chlorosis

High soil pH (alkaline conditions) can lock iron in the soil, making it unavailable to the pea plant. Unlike nitrogen deficiency, this causes yellowing between the veins (interveinal chlorosis) while the veins remain green.

Common

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How to confirm: Observe if the newest, top leaves are turning yellow while the leaf veins stay distinctly dark green.

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1 Test your soil pH to confirm alkalinity; for garden peas, a slightly acidic to neutral pH (6.0–7.0) is ideal to ensure iron availability.