Nephrolepis exaltata (Boston Fern) Brown Leaf Tips - Causes & Fixes

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Low Humidity

Boston Ferns are tropical plants that require high ambient moisture; dry air causes the delicate frond tips to desiccate and turn crispy brown.

Very Common

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How to confirm: Check if the air is particularly dry due to indoor heating or air conditioning use.

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1 Increase ambient humidity around the plant by using a pebble tray or a humidifier to prevent further tip desiccation.

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2 Regularly mist the fronds with a fine mist spray to provide immediate moisture to the leaves.

Flora Premium Plant Mister

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3 Trim away the crispy brown tips with clean scissors to improve the plant's appearance and prevent further drying.

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Underwatering

If the substrate dries out completely, the fern cannot transport water to the furthest extremities of the fronds, leading to tip necrosis.

Very Common

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How to confirm: Stick your finger into the soil; if it is bone dry well below the surface, the plant is dehydrated.

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1 Check the soil moisture level immediately using a moisture meter to determine if the substrate has reached a critical dry point.

GROWIT Soil Moisture Meter - Blue

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2 Increase watering frequency to ensure the soil remains consistently moist, and consider using a pebble tray or mister to boost humidity around the fronds.

Flora Premium Plant Mister

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3 Trim away the dead, brown tips with clean scissors to prevent further aesthetic decline and improve the plant's appearance.

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Salt/Mineral Accumulation

Excessive buildup of minerals from tap water or fertilizers can cause osmotic stress, manifesting as burnt-looking brown tips on the fronds.

Common

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How to confirm: Observe if there is a white crusty residue on the soil surface or the edges of the pot.

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1 Flush the soil thoroughly with distilled or rainwater to leach out accumulated mineral salts and prevent further osmotic stress.

2 Use a moisture meter to ensure you are not overwatering, as high moisture levels can exacerbate salt-induced root stress.

GROWIT Soil Moisture Meter - Blue

Water Meters

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3 Switch to a high-quality organic fertilizer and avoid over-fertilizing to prevent future mineral buildup.

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Fungal Leaf Spot (e.g., Rhizoctonia)

While less common than environmental issues, high moisture coupled with poor air circulation can trigger fungal pathogens that cause browning.

Common

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How to confirm: Inspect if the brown areas are accompanied by dark, spreading lesions on the pinnae rather than just the tips.

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1 Prune and remove all affected brown leaves using sterilized shears to prevent the fungal pathogen from spreading to healthy foliage.

Fiskars 5/8" Bypass Pruning Shears

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2 Apply a fungicide to the plant and surrounding area to control the spread of Rhizoctonia, and ensure the plant is in a location with improved air circulation.

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3 Adjust your watering routine to avoid getting water on the leaves, as wet foliage promotes fungal growth; use a moisture meter to ensure the soil stays damp but not waterlogged.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock