Zantedeschia Cantor Sudden Leaf Drop - Causes & Fixes

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Overwatering and Root Rot

Calla Lilies are susceptible to Phytophthora rot when soil remains saturated. Excess moisture deprives the roots of oxygen, causing the plant to shed leaves as it fails to transport water to the foliage.

Very Common

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How to confirm: Gently lift the plant from its pot to check if the rhizomes or roots feel mushy and smell of decay.

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

2 Repot the Calla Lily in a fresh, well-draining potting medium and ensure the new container has adequate drainage to prevent future waterlogging.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Use a soil moisture meter to monitor the substrate, ensuring you only water when the top inch of soil feels dry to avoid further oxygen deprivation.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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Temperature Shock

Zantedeschia species are sensitive to sudden drops in temperature, especially below 55°F (13°C). Rapid cooling causes the plant to enter a stress response, leading to rapid leaf senescence and drop.

Very Common

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How to confirm: Check if there has been a recent cold snap or if the plant is positioned near a drafty window or air conditioning vent.

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1 Immediately move the plant to a stable, warm environment, ensuring temperatures remain consistently above 55°F (13°C) to prevent further stress.

2 Avoid placing the plant near cold drafts, air conditioning vents, or unheated windows to stabilize the microclimate.

3 Monitor soil moisture closely using a moisture meter, as temperature fluctuations can disrupt normal transpiration and watering needs.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Fungal Leaf Spot (Botrytis)

High humidity combined with poor airflow can trigger Botrytis cinerea, which causes foliage to wilt and drop. This is particularly common in 'Cantor' when moisture sits on the leaves for extended periods.

Common

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How to confirm: Inspect the remaining leaves for small, dark, water-soaked spots or fuzzy grey mold patches.

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1 Remove and discard all infected leaves immediately to prevent the fungus from spreading to healthy foliage.

2 Apply a fungicide to protect remaining leaves and improve air circulation around the plant to reduce humidity.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Adjust watering habits to ensure water does not sit on the leaves, and consider using a fan to increase airflow.

Flora Premium Plant Mister

Spray Bottles

$12

In Stock

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Nutrient Deficiency (Nitrogen)

A lack of available nitrogen prevents the plant from maintaining chlorophyll levels in the foliage. As the plant mobilizes remaining nutrients to the rhizome, older leaves will yellow and drop.

Common

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How to confirm: Observe if the leaf drop is progressing from the oldest, bottom-most leaves toward the new growth.

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