Allium porrum Mako Bello F1 Brown Leaf Tips - Causes & Fixes

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Salt Accumulation (Salinity Stress)

Leeks are sensitive to high concentrations of soluble salts in the soil or fertilizers. Excessive mineral buildup causes osmotic stress, which prevents water from reaching the leaf extremities, leading to tip necrosis.

Very Common

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How to confirm: Check if you have recently applied high-nitrogen fertilizers or if your irrigation water has a high mineral content.

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

2 Monitor soil moisture levels closely to ensure the leaching process does not lead to waterlogging, using a moisture meter to maintain optimal hydration.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Avoid applying any further liquid fertilizers or salt-based amendments until the soil salinity has stabilized and new growth appears healthy.

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Anthracnose (Colletotrichum species)

This fungal pathogen can cause necrotic lesions that often begin at the leaf tips or margins in Allium species. High humidity and cool temperatures favor the spread of these fungal spores through the foliage.

Common

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How to confirm: Inspect the brown areas for small, dark, sunken lesions or any visible fungal fruiting bodies (black dots) on the leaf surface.

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1 Apply an organic fungicide to control the spread of the Colletotrichum fungus and protect healthy tissue.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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2 Prune and remove any heavily infected leaves to reduce the fungal spore load in the environment.

3 Improve air circulation around the plants and avoid overhead watering to lower humidity levels around the foliage.

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Nitrogen Deficiency

While nitrogen deficiency often causes general yellowing (chlorosis), a severe lack of nitrogen can lead to the senescence and browning of older leaf tips as the plant redistributes nutrients to new growth.

Common

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How to confirm: Observe if the browning is starting on the oldest, bottom leaves while the newer top leaves remain relatively green.

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1 Apply a nitrogen-rich organic fertilizer to the soil to replenish essential nutrients and stop the progression of leaf browning.

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

Organic Fertilizer

$40

Out of Stock

2 Monitor the soil moisture levels using a moisture meter to ensure the plant is not experiencing drought stress, which can exacerbate tip burn.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Ensure the plant is receiving adequate sunlight and consistent nutrition to support healthy new growth and prevent nutrient redistribution from older leaves.

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Drought Stress

Leeks have shallow root systems and require consistent moisture. When soil moisture levels drop significantly, the plant sacrifices the leaf tips to conserve water for the core of the bulb.

Common

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How to confirm: Check the soil moisture level 2-3 cm below the surface; if it is bone dry, the plant is likely suffering from dehydration.

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1 Check the soil moisture level immediately using a moisture meter to confirm if the drought stress is ongoing.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 Apply consistent watering to the base of the plant, ensuring the shallow root system remains hydrated without waterlogging.