Allium cepa Medusa F1 Brown Leaf Tips - Causes & Fixes

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Nitrogen Deficiency

Onions have a high demand for nitrogen during their rapid growth phase. When nitrogen is depleted, the plant cannot maintain chlorophyll levels, often resulting in tip necrosis and general chlorosis starting from the leaf tips.

Very Common

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How to confirm: Check if the older, outer leaves are turning pale yellow before the brown tips appear.

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

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Incorporate an organic soil amendment like blood meal into the soil to provide a sustained release of nitrogen for the upcoming growth phase.

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

Organic Fertilizer

$40

Out of Stock

3 Monitor soil moisture levels regularly to ensure the nitrogen is being effectively transported to the leaves.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Salt Accumulation (Salinity Stress)

Onions are sensitive to high levels of soluble salts in the soil. Excessive fertilizer use or poor irrigation water quality causes salt to accumulate at leaf margins, leading to 'tip burn' as the plant attempts to sequester salts.

Very Common

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How to confirm: Examine if there is a white, crusty residue on the soil surface near the base of the onion bulbs.

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1 Flush the soil thoroughly with large amounts of fresh, low-salt water to leach accumulated mineral salts away from the root zone.

2 Monitor soil moisture levels closely to prevent future salt buildup, ensuring the soil does not become overly dry between waterings.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Reduce the frequency of liquid fertilization and avoid using high-salt fertilizers until the plant shows signs of recovery.

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Water Stress (Drought or Fluctuating Moisture)

Medusa F1 onions require consistent moisture to develop large bulbs. Rapid drying of the soil causes the leaf tips to desiccate and turn brown as the plant prioritizes water delivery to the bulb over the extremities.

Very Common

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How to confirm: Feel the soil moisture at a depth of 2-3 inches to see if it has become bone dry recently.

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1 Check the soil moisture level immediately using a moisture meter to determine if the plant is currently in a drought state.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Establish a consistent watering schedule to prevent the soil from drying out completely between waterings, ensuring the bulb remains hydrated.

PlanKKers Terracotta Watering Spikes (Set 6)

Terracotta

$17

In Stock

3 Apply a layer of organic mulch or organic matter around the base of the onion to help retain soil moisture and regulate temperature.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

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Botrytis Leaf Blight (Botrytis cepa)

High humidity and poor airflow can promote fungal infections. While often presenting as lesions, early-stage infection can manifest as necrotic brown tips that may eventually spread down the leaf blade.

Common

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How to confirm: Look for fuzzy grey mold growth on the affected leaf tips during damp mornings.

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1 Improve air circulation around the plants and reduce humidity to prevent the fungal spores from spreading to healthy leaves.

2 Apply an organic fungicide to control the spread of the Botrytis infection and protect new growth.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Prune and remove any heavily infected or necrotic leaves immediately, ensuring you dispose of them away from your garden to prevent further contamination.