Onion Teon 307 F1 Brown Leaf Tips - Causes & Fixes

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Salt Accumulation (Salinity Stress)

Onion varieties like Teon 307 are sensitive to high levels of soluble salts in the soil or irrigation water. Excess salts accumulate at the leaf margins and tips, causing localized cellular death and browning.

Very Common

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How to confirm: Check your irrigation water source for high mineral content or observe if symptoms appeared after recent heavy fertilization.

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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 Amend the soil with organic matter like worm castings to improve soil structure and help buffer against salinity stress.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

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Nitrogen Deficiency

While nitrogen deficiency often causes overall yellowing, it frequently manifests as tip necrosis in onions when the plant cannot sustain its rapid growth phase. This is common during high-demand stages of Teon 307 development.

Very Common

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How to confirm: Inspect if the browning is accompanied by a general pale green or yellowish color across the entire leaf blade.

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1 Apply a nitrogen-rich liquid fertilizer to provide immediate nutrient uptake during this high-demand growth phase.

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

Organic Fertilizer

$40

Out of Stock

2 Supplement the soil with an organic nitrogen source like blood meal to ensure a sustained release of nutrients.

Back to the Roots Organic Blood Meal

Organic Fertilizer

$10

In Stock

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Water Stress (Drought or Fluctuating Moisture)

Inconsistent moisture levels cause the plant to lose turgor pressure at the furthest extremities of the leaves. For red onions, sudden dry spells during bulb expansion can trigger tip necrosis.

Common

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How to confirm: Monitor soil moisture levels and check if the browning coincides with periods of significantly low rainfall or skipped irrigation.

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1 Monitor soil moisture levels closely using an analog meter to ensure the soil remains consistently moist but not waterlogged, preventing the dry spells that cause tip necrosis.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 Apply a consistent watering schedule, especially during the bulb expansion stage, to maintain stable turgor pressure in the leaves.

Chapin 48000 0.5G Watering Can

2.3 L • Recycled Plastic

$12

In Stock

3 Mulch the base of the onion plants with organic matter to help retain soil moisture and buffer against temperature-induced evaporation.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

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Botrytis Leaf Blight (Early Stage)

Fungal pathogens like Botrytis can cause necrotic lesions that start at the leaf tips. In humid conditions, these brown spots may eventually develop fuzzy grey mold.

Common

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How to confirm: Look closely at the brown areas for any signs of grey, fuzzy fungal growth or water-soaked lesions.

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

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