Anthurium andraeanum Namora Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Anthuriums are highly sensitive to moisture; saturated substrate causes anaerobic conditions that lead to Phytophthora or Pythium, resulting in chlorosis (yellowing) starting from the older leaves.

Very Common

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How to confirm: Check if the potting medium is soggy to the touch and inspect the roots for a brown, slimy texture instead of firm white ones.

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1 Immediately remove the plant from its current pot and inspect the roots; trim away any mushy, black, or foul-smelling roots using sterilized tools.

2 Repot the Anthurium in a fresh, highly aerated substrate to prevent future anaerobic conditions, ideally mixing in perlite for better drainage.

3 Use a moisture meter to monitor the substrate, ensuring you only water when the top inch of soil is dry to avoid repeat overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

A lack of available nitrogen prevents the production of chlorophyll, causing older leaves to turn uniformly yellow as the plant redistributes nutrients to new growth.

Very Common

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How to confirm: Observe if the yellowing is progressing from the bottom of the plant upward and consider applying a balanced liquid fertilizer.

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1 Apply a nitrogen-rich liquid fertilizer to boost chlorophyll production and support new growth.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Monitor the soil moisture levels using a moisture meter to ensure nitrogen is being delivered effectively without causing root rot.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Prune any completely yellow or dead leaves to allow the plant to focus its energy on healthy new foliage.

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Low Humidity or Heat Stress

Anthurium andraeanum requires high humidity; when levels drop significantly, the plant undergoes transpiration stress which can manifest as yellowing of leaf margins and tips.

Common

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How to confirm: Use a hygrometer to check if your ambient humidity is consistently below 50%.

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

Bleuhome 6-Pack 6in Plant Saucers Black

Pot Saucers

$6

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2 Mist the foliage regularly with a fine spray to provide immediate moisture to the leaves.

Flora Premium Plant Mister

Spray Bottles

$12

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3 Ensure the plant is kept in a stable environment away from heat vents or direct hot sunlight to mitigate heat stress.

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Light Intensity Stress (Photoinhibition)

While they need bright light, direct sunlight or intense midday sun can bleach the chlorophyll in the leaves, leading to yellow patches and eventual leaf death.

Common

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How to confirm: Check if the yellowing areas are located on parts of the plant directly exposed to a window or grow light.

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1 Move your Anthurium to a location with bright, indirect light, away from direct midday sun rays to prevent further chlorophyll bleaching.

2 If the plant is in a high-intensity light area, supplement with a controlled light source like a full-spectrum LED grow light to maintain stable light levels.

SANSI 10W Full Spectrum Gooseneck Grow Light

1 pcs

$19

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3 Monitor the soil moisture levels closely, as light stress can often coincide with improper watering; use a moisture meter to ensure the roots are not over-saturated.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock