Zantedeschia Captain Ventura Sudden Leaf Drop - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia species are sensitive to stagnant water; excessive moisture in the growing medium leads to Phytophthora or Pythium, which destroys the tuber's ability to support foliage, causing rapid leaf senescence.

Very Common

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How to confirm: Gently lift the tuber from the soil to check for mushy, foul-smelling brown roots.

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

2 Repot the plant in a fresh, well-draining medium and ensure the new pot has excellent drainage to prevent water from pooling around the tuber.

3 Use a soil moisture meter to monitor the growing medium, ensuring you only water when the top inch of soil feels dry to avoid future overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Shock or Cold Stress

Calla Lilies are tropical/subtropical plants that react to sudden drops in temperature by shedding foliage to protect the tuber during dormancy.

Very Common

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

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1 Move the plant to a stable, warm environment away from cold drafts or air conditioning vents to prevent further temperature fluctuations.

2 Monitor the soil moisture closely to ensure the tuber does not rot during this period of dormancy; use a moisture meter to prevent overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 If the plant is in a container, ensure it is in a well-draining pot and consider adding perlite to the soil to improve aeration and prevent moisture buildup.

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Fungal Leaf Spot (Botrytis cinerea)

High humidity combined with poor airflow can trigger Botrytis, which causes lesions on the leaves that eventually lead to the entire petiole detaching from the base.

Common

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How to confirm: Inspect the remaining leaves for small, brown, water-soaked spots or fuzzy gray mold.

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

2 Apply an organic fungicide to the plant to control the Botrytis infection and protect remaining foliage.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

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3 Improve air circulation around the plant and reduce humidity by avoiding overhead watering and ensuring better airflow.

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Nutrient Deficiency (Nitrogen)

A lack of available nitrogen prevents the plant from maintaining chlorophyll levels in the large surface area of 'Captain Ventura' leaves, leading to yellowing and shedding.

Common

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How to confirm: Observe if the older, lower leaves are turning yellow before dropping.

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1 Apply a nitrogen-rich liquid fertilizer to boost chlorophyll production and stop further leaf drop.