Kalanchoe tomentosa Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Kalanchoe tomentosa is a succulent that stores water in its leaves; excessive moisture causes the roots to suffocate and decay, leading to systemic yellowing. This is the most frequent cause of chlorosis in this species.

Very Common

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How to confirm: Press the base of the stem or the soil; if it feels mushy or smells musty, root rot is likely present.

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

2 Repot the Kalanchoe in a well-draining, gritty substrate specifically designed for succulents to prevent future moisture retention.

3 Use a moisture meter to monitor the soil, ensuring you only water when the medium is completely dry to the touch.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nutrient Deficiency (Nitrogen)

A lack of nitrogen prevents the plant from producing chlorophyll, causing older leaves to turn yellow before progressing to newer growth. This often occurs if the succulent has been in the same potting medium for several years without fertilization.

Common

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How to confirm: Observe if the yellowing starts specifically on the oldest, bottom-most leaves while new growth remains green.

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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 Repot the Kalanchoe in fresh, well-draining potting soil to replenish depleted nutrients in the growing medium.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Monitor soil moisture levels with a meter to ensure overwatering isn't exacerbating the yellowing of older leaves.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Insufficient Light

While Kalanchoe tomentosa loves bright light, extreme shade can lead to a loss of pigmentation and yellowing as the plant fails to photosynthesize efficiently. This is often accompanied by 'leggy' or stretched stem growth.

Common

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How to confirm: Check if the leaves are also becoming thinner and the internodes (space between leaves) are noticeably longer than usual.

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shopping_cart Recommended Products

1 Move your Kalanchoe to a much brighter location, ideally receiving several hours of direct or very bright indirect sunlight to restore photosynthesis.

SANSI 4-Head 40W LED Grow Light

4 pcs

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2 Supplement with a full-spectrum LED grow light if natural light is insufficient to prevent further stretching and yellowing.

SANSI 4-Head 40W LED Grow Light

4 pcs

—

3 Monitor the soil moisture closely using a moisture meter to ensure the plant is not also suffering from overwatering, which can mimic yellowing symptoms.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Stress (Cold Shock)

Being a tropical succulent, sudden exposure to temperatures below 50°F (10°C) can cause cellular damage in the fleshy leaves, resulting in yellowing or translucent patches.

Common

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How to confirm: Check if the plant was recently moved near a drafty window or an air conditioning vent.

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shopping_cart Recommended Products

1 Immediately move the plant to a warmer environment, ensuring temperatures remain consistently above 50°F (10°C) to prevent further cellular damage.

2 Monitor the soil moisture closely using a moisture meter, as cold stress can slow down evaporation and increase the risk of root rot.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 If the plant shows signs of recovery, apply a light feeding of seaweed fertilizer to help boost nutrient uptake and stress recovery.