Onion Fire King F1 Brown Leaf Tips - Causes & Fixes

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Nitrogen Deficiency

Onions require significant nitrogen for leaf development; a deficiency often manifests as yellowing that progresses to brown, necrotic tips on the foliage.

Very Common

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How to confirm: Check if the newer leaves are pale or yellowish before the tips turn brown.

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1 Apply a nitrogen-rich organic fertilizer to the soil to replenish essential nutrients for leaf development.

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

Organic Fertilizer

$40

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2 Monitor the soil moisture levels regularly to ensure the nitrogen is being effectively absorbed by the roots.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Osmotic Stress (Salt Accumulation)

High salinity in the soil from over-fertilization or hard water causes 'tip burn,' where moisture cannot reach the leaf extremities, resulting in scorched brown edges.

Very Common

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How to confirm: Inspect the soil surface for a white, crusty salt buildup.

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1 Flush the soil thoroughly with large amounts of fresh, low-mineral water to leach out accumulated salts and reduce soil salinity.

2 Monitor the soil moisture levels closely to prevent future over-fertilization and ensure consistent hydration using a moisture meter.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Avoid applying high-salt fertilizers and consider amending the soil with organic matter like worm castings to improve salt buffering capacity.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

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Water Stress (Drought or Fluctuating Moisture)

Onion bulbs need consistent moisture to develop; intermittent drying cycles cause the delicate leaf tips to desiccate and turn brown.

Very Common

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How to confirm: Check the moisture level of the soil at least two inches below the surface.

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1 Monitor soil moisture levels closely using an analog meter to ensure the soil remains consistently damp but not waterlogged.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 Apply a consistent watering schedule to prevent the drying cycles that cause tip desiccation, and consider using a mulch or organic matter to help retain moisture.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 If the soil is drying out too quickly, amend the planting area with organic matter like worm castings to improve water retention.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

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Ascochyta Leaf Blight

This fungal pathogen causes lesions that often start at the leaf tips and move downward, appearing as brownish, necrotic patches on the Fire King foliage.

Common

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How to confirm: Look for small, dark fruiting bodies (pycnidia) within the brown lesions.

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1 Remove and destroy all infected foliage immediately to prevent the fungal spores from spreading to healthy onion plants.

2 Apply an organic fungicide to protect remaining healthy tissue from further lesions.