Begonia Monza Pink 138 Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Rex Begonias are highly susceptible to moisture retention. Excess water in the substrate leads to fungal pathogens like Pythium, causing leaves to turn yellow and eventually become translucent or mushy.

Very Common

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How to confirm: Gently lift the plant from its pot to check if the roots are dark brown and slimy instead of firm and white.

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

2 Repot the Begonia in a fresh, well-draining medium and ensure the new container has adequate drainage to prevent water pooling.

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

A lack of nitrogen prevents the production of chlorophyll, leading to chlorosis (yellowing) that typically starts on older, lower leaves of the Begonia Monza.

Common

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How to confirm: Observe if the yellowing is progressing from the bottom of the plant upwards and check your fertilizer N-P-K ratio.

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1 Apply a nitrogen-rich liquid fertilizer to boost chlorophyll production and green up the foliage.

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 away the most severely yellowed lower leaves to allow the plant to redirect nutrients to new growth.

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Low Humidity or Heat Stress

Rex Begonias require high humidity; when the air is too dry, the leaf margins may turn yellow and crisp as the plant struggles to regulate transpiration.

Common

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How to confirm: Check if the edges of the yellowing leaves feel dry and brittle compared to the center of the leaf.

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1 Increase local humidity around the plant by using a pebble tray or a humidifier to prevent leaf margins from crisping.

Bleuhome 6-Pack 6in Plant Saucers Black

Pot Saucers

$6

In Stock

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

Flora Premium Plant Mister

Spray Bottles

$12

In Stock

3 Move the plant away from heat vents, radiators, or direct sunlight to reduce environmental heat stress.

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Light Intensity Issues

While they love bright indirect light, direct afternoon sun can scorch the delicate pink pigments in the Monza variety, leading to localized yellowing and bleaching.

Common

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How to confirm: Check if the yellow patches are located specifically on parts of the leaf that receive direct window light.

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shopping_cart Recommended Products

1 Move your Begonia to a spot that receives bright, indirect light, ensuring it is shielded from harsh, direct afternoon sun to prevent pigment bleaching.

2 If the plant is in a low-light corner, supplement its environment with a full-spectrum grow light to maintain healthy leaf color.

SANSI 10W Full Spectrum Gooseneck Grow Light

1 pcs

$19

In Stock

3 Monitor the soil moisture levels closely, as light intensity changes can affect evaporation rates and lead to secondary yellowing from overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock