Savoy Cabbage Convoy F1 Yellow Leaves - Causes & Fixes

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Nitrogen Deficiency

Nitrogen is highly mobile within the plant; when deficient, the cabbage pulls nutrients from older leaves to support new growth. This results in a characteristic uniform yellowing of the bottom-most leaves first.

Very Common

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How to confirm: Check if the yellowing started on the oldest, outermost leaves and if recent fertilizer applications were skipped.

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1 Apply a nitrogen-rich organic fertilizer to the soil to quickly replenish the plant's nutrient levels.

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

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

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Overwatering/Waterlogged Soil

Excessive soil moisture deprives the roots of oxygen, leading to root hypoxia. This impairs the cabbage's ability to uptake nutrients, manifesting as chlorosis (yellowing) across the foliage.

Very Common

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How to confirm: Stick your finger deep into the soil to see if it remains saturated or feels muddy for extended periods.

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1 Immediately reduce watering frequency and ensure the plant is in a well-draining environment to allow the soil to dry out.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Check the soil moisture levels regularly using a meter to prevent future waterlogging and root hypoxia.

GROWIT Analog Soil Moisture Meter

Water Meters

—

3 If the soil remains saturated, repot the cabbage in a more aerated medium by mixing in horticultural perlite to improve drainage.

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Clubroot (Plasmodiophora cruciferarum)

This soil-borne pathogen causes galls on the roots of brassicas, disrupting water and nutrient transport. The resulting physiological stress manifests as yellowing leaves, often accompanied by wilting during the day.

Common

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How to confirm: Carefully uproot one plant to check for abnormal swelling or 'clubs' on the root system.

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1 Remove and destroy the infected plant and all surrounding soil immediately to prevent the spread of the soil-borne pathogen to healthy brassicas.

2 Sterilize all gardening tools, such as your trowel or pruners, with a disinfectant to avoid transporting clubroot spores to other areas.

Fiskars 3-in-1 Garden Tool Set

3 pcs

$25

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3 Amend future planting sites with organic matter and ensure well-draining soil to reduce the likelihood of clubroot development.

Espoma Organic Potting Soil Mix

15.1 L

$22

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Magnesium Deficiency

Magnesium is a central component of chlorophyll. A deficiency in Savoy cabbage often presents as interveinal chlorosis, where the veins remain green while the tissue between them turns yellow.

Common

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How to confirm: Inspect the leaves for a pattern where the leaf veins stay dark green while the surrounding area turns pale yellow.

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1 Apply a magnesium-rich supplement to the soil to restore chlorophyll production and address interveinal chlorosis.