Zantedeschia Captain Kelso Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia species are sensitive to stagnant water; excessive moisture in the rhizome area causes fungal pathogens like Phytophthora to trigger leaf chlorosis. This prevents the plant from transporting oxygen and nutrients through the vascular system.

Very Common

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How to confirm: Gently lift the rhizome from the pot to check if the base is soft, mushy, or smells of decay.

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1 Immediately remove the plant from its current container and inspect the rhizome for mushy, dark, or foul-smelling rot.

2 Prune away all dead or rotting roots using sterilized shears and repot the plant in a well-draining, fresh medium like Espoma Organic Potting Soil Mix to prevent further fungal growth.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Ensure the new pot has excellent drainage and use a moisture meter to monitor the soil, preventing the rhizome area from becoming waterlogged.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

Yellowing (chlorosis) often begins in older leaves when nitrogen levels in the potting medium are depleted. Since Calla Lilies are heavy feeders during their growth phase, a lack of nitrogen prevents chlorophyll production.

Very Common

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How to confirm: Observe if the yellowing is progressing from the bottom (oldest) leaves upward toward the new growth.

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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 Incorporate an organic soil amendment like worm castings into the top layer of the soil to provide long-term nutrient release.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor soil moisture levels with a meter to ensure the plant is not experiencing water stress, which can mimic nutrient deficiency symptoms.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Stress (Cold Shock)

Yellowing can occur if the 'Captain Kelso' is exposed to temperatures below 50°F (10°C). Sudden drops in temperature cause the plant to enter a defensive state, leading to rapid breakdown of chlorophyll in the foliage.

Common

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How to confirm: Check for recent exposure to cold drafts from windows or sudden drops in ambient room temperature.

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

2 Monitor the soil moisture closely using a moisture meter to ensure the plant is not being overwatered while in its stressed, dormant-like state.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Once the plant stabilizes, apply a microbial-based fertilizer to support root zone recovery and help the plant bounce back from the temperature shock.

FoxFarm Bush Doctor Boomerang Liquid Plant Fertilizer 1 Pint

0.5 L • 1 pcs

$20

In Stock

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Light Intensity Issues (Sunscald or Low Light)

While they love light, direct, intense midday sun can scorch the leaves of 'Captain Kelso', causing yellow/bleached patches. Conversely, extremely low light levels will cause the plant to lose its deep green color as it cannot sustain photosynthesis.

Common

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How to confirm: Inspect if the yellow patches are specifically located on surfaces directly facing a bright window.

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1 Relocate your Calla Lily to a spot with bright, indirect light to prevent sunscald, or increase light exposure if the plant is in a dark corner.

SANSI 4-Head 40W LED Grow Light

4 pcs

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2 Monitor the light levels using a light meter or by observing the plant's reaction to its environment to ensure it receives consistent, filtered brightness.