Lactuca sativa – Brown Leaf Tips

GROWIT Soil Moisture Meter - Teal

2 Improve airflow around the lettuce plants to reduce humidity and facilitate better calcium transport through transpiration.

3 Ensure consistent soil moisture levels to prevent growth spurts that outpace calcium uptake.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

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Salt Accumulation (Salinity Stress)

Excessive fertilizer salts or high sodium levels in irrigation water can cause osmotic stress. This leads to desiccation of the leaf margins, manifesting as brown, crispy tips.

Very Common

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How to confirm: Test your soil/growing medium for high electrical conductivity (EC) or check if you have recently applied heavy doses of nitrogen fertilizer.

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shopping_cart Recommended Products

1 Flush the growing medium thoroughly with large amounts of fresh, low-sodium water to leach out accumulated mineral salts.

2 Reduce the frequency of fertilization and ensure you are using a diluted strength to prevent further salt buildup.

0.9 L • 1 pcs

$32

GROWIT Soil Moisture Meter - Blue

3 Monitor soil moisture levels closely using a moisture meter to ensure consistent hydration without overwatering.

GROWIT Soil Moisture Meter - Blue

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Drought Stress

Lettuce has a shallow root system and high water content; insufficient soil moisture causes the plant to sacrifice leaf margins to conserve water. This leads to rapid drying and browning of the tips.

Common

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How to confirm: Feel the soil depth; if it is dry several centimeters below the surface, the plant is likely dehydrated.

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1 Check the soil moisture level immediately using a moisture meter to confirm the depth of the drought stress.

Chapin 48000 0.5G Watering Can

2 Apply consistent watering to the base of the plant, ensuring the shallow root system remains moist but not waterlogged.

2.3 L • Recycled Plastic

Yilotuce 11oz Sphagnum Moss

3 Mulch the soil surface with organic matter to help retain moisture and prevent future evaporation.

18.7 L • Sphagnum Moss

$18

GROWIT Soil Moisture Meter - Blue

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Water Temperature Fluctuations

Extreme temperature shifts can disrupt the transpiration stream. If the roots are in very cold or very hot water/soil, it can interfere with nutrient uptake, leading to necrotic leaf edges.

Common

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How to confirm: Monitor the ambient temperature and the consistency of your irrigation water temperature during heatwaves or cold snaps.

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1 Stabilize the root zone temperature by using mulch or a consistent water source to prevent rapid shifts between hot and cold.

2 Monitor soil moisture levels closely to ensure the plant is not experiencing drought stress alongside temperature shifts.