Zantedeschia Gold Medal Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia species are sensitive to saturated soil; constant moisture leads to fungal pathogens like Phytophthora causing the rhizome to decay. This disruption in water transport manifests as yellowing foliage.

Very Common

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How to confirm: Gently lift the pot to check if the soil is waterlogged or if the rhizome feels soft and mushy.

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

2 Prune away all decayed roots using sterilized tools and repot the plant in a well-draining medium, such as a mix containing Legigo Organic Horticultural Perlite (ID: 732) to improve aeration.

3 Switch to a more breathable pot and use a moisture meter (ID: 469) to ensure the soil is allowed to dry out significantly between watering sessions to prevent future rot.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

Golden Calla Lilies have high nutrient demands during their growing season. A lack of nitrogen prevents chlorophyll production, leading to a uniform yellowing starting with older leaves.

Very Common

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How to confirm: Observe if the yellowing is progressing from the bottom of the plant upwards and check your recent fertilization schedule.

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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 soil to provide slow-release nutrients.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

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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)

Calla Lilies are tropical perennials that thrive in warmth. Exposure to temperatures below 50°F (10°C) can cause the plant's metabolic processes to slow down, resulting in chlorosis.

Common

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How to confirm: Check if the plant has recently been exposed to drafts or nighttime temperature drops near a window.

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1 Move the plant to a warmer, draft-free location within your home, ensuring temperatures remain consistently above 60°F (15°C).

2 Monitor the soil moisture closely to ensure the plant is not overwatered while its metabolism is slowed by the cold.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a liquid fertilizer to help the plant recover once it has stabilized in a warmer environment.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

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Light Stress (Sunscald)

While they love bright light, sudden exposure to intense, direct afternoon sun can bleach the leaves. This solar radiation damage causes the leaf tissue to turn yellow or white.

Common

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How to confirm: Look for localized yellow/white patches specifically on parts of the leaf facing the strongest light source.

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shopping_cart Recommended Products

1 Move the plant to a location with bright, filtered light or provide afternoon shade to prevent further sunscald.

2 Monitor the soil moisture levels to ensure the plant is not also experiencing heat-induced dehydration.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 If the plant is in a high-heat area, consider using a grow light with a controlled spectrum to provide consistent light without the intense heat of direct sun.