Eruca sativa Brown Leaf Tips - Causes & Fixes

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Salt Accumulation (Fertilizer Burn)

Arugula is sensitive to high concentrations of soluble salts in the soil. Excessive nitrogen fertilization can cause ions to accumulate at the leaf margins, leading to marginal necrosis or brown tips.

Very Common

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How to confirm: Check if you have recently applied a high-nitrogen liquid fertilizer or if there is white crusting on the soil surface.

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1 Flush the soil thoroughly with plenty of fresh, room-temperature water to leach out the accumulated mineral salts from the root zone.

2 Check the soil moisture levels regularly using a moisture meter to ensure you are not overwatering while trying to flush the salts.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

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3 Reduce the frequency of fertilization and avoid using high-nitrogen products until the plant shows signs of recovery.

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Water Stress (Drought or Uneven Watering)

As a leafy green with shallow roots, Eruca sativa is highly susceptible to rapid transpiration. When soil moisture drops significantly, the plant sacrifices the furthest extremities of the leaves first.

Very Common

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How to confirm: Feel the soil 1 inch below the surface to see if it has become bone-dry between waterings.

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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 - Blue

Water Meters

$12

In Stock

2 Establish a consistent watering schedule to prevent the soil from drying out completely, ensuring the shallow root system stays hydrated.

Chapin 48000 0.5G Watering Can

2.3 L • Recycled Plastic

$12

In Stock

3 Apply a mulch layer or use a moisture-retaining substrate like vermiculite to help stabilize soil moisture levels.

Back to the Roots Organic Vermiculite 24qt

22.7 L • Vermiculite

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Calcium Deficiency (Tip Burn)

Commonly seen in high-humidity or low-airflow environments, calcium is immobile within the plant. If transpiration is disrupted, calcium cannot reach the leaf edges, causing cell death at the tips.

Common

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How to confirm: Observe if the brown tips are accompanied by stunted growth in new, emerging leaves.

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1 Apply a calcium supplement to the soil to address the deficiency and strengthen cell walls.

FoxFarm Bush Doctor Cal Mag Liquid Supplement 1 Pint

0.5 L • 1 pcs • Organic

$22

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2 Improve air circulation around the plant using a small fan to enhance transpiration and calcium transport.

3 Monitor soil moisture levels closely to ensure consistent watering, as fluctuations can disrupt calcium uptake.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Fluctuations (Heat Stress)

Arugula prefers cool weather; extreme heat causes rapid moisture loss from leaf edges that the root system cannot compensate for, resulting in scorched-looking brown tips.

Common

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How to confirm: Check if the symptom appeared during a sudden heatwave or if daytime temperatures are exceeding 80°F (27°C).

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1 Relocate your arugula to a cooler, shaded area or use a shade cloth to protect the leaves from direct, intense sunlight and heat spikes.

2 Monitor soil moisture levels closely to ensure the roots remain hydrated during heat waves; use a moisture meter to prevent the soil from drying out completely.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a light mulch around the base of the plant to help regulate soil temperature and reduce evaporation.