Zantedeschia elliottiana Sudden Leaf Drop - Causes & Fixes

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Overwatering and Root Rot

Excessive moisture in the soil prevents oxygen from reaching the rhizomes, leading to fungal pathogens like Pythium. This causes a rapid decline in foliage health as the roots can no longer support the plant.

Very Common

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How to confirm: Gently lift the pot or check the soil depth; if it is soggy and the rhizome feels soft or slimy, rot is present.

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

2 Prune away all decayed root tissue using sterilized tools and repot the plant in a well-draining, airy medium like a mix containing perlite or orchid bark.

3 Switch to a pot with excellent drainage and use a moisture meter to ensure the soil is allowed to dry out significantly between waterings.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Shock/Cold Stress

Calla Lilies are sensitive to sudden drops in temperature. Exposure to frost or temperatures below 50°F (10°C) can cause the plant to enter an emergency dormancy, resulting in rapid leaf senescence and drop.

Very Common

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How to confirm: Check if the plant was recently moved near a drafty window or exposed to nighttime temperature dips.

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1 Immediately move the plant to a warm, draft-free indoor location with temperatures consistently above 60°F (15°C) to stabilize the plant.

2 Avoid further temperature fluctuations and check soil moisture with a meter to ensure the plant isn't also suffering from cold-induced root rot.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Once the plant stabilizes, apply a liquid seaweed fertilizer to help the plant recover from environmental stress and promote new growth.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

$32

In Stock

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Fungal Leaf Spot (Phytophthora)

Pathogens such as Phytophthora can cause lesions on the leaves that quickly expand, leading to tissue death and abscission. This is common in high-humidity environments with poor air circulation.

Common

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How to confirm: Inspect the remaining leaves for dark, water-soaked spots or yellowing margins near the leaf base.

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1 Remove and discard all infected leaves immediately to prevent the spread of the pathogen to healthy tissue.

2 Apply an organic fungicide to the affected areas to control the spread of the Phytophthora pathogen.

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, ensuring the soil surface dries between waterings.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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Nutrient Deficiency (Nitrogen)

A severe lack of nitrogen prevents the plant from maintaining its large, lush foliage, causing older leaves to turn yellow and drop. This is common if the plant has been in the same potting mix for multiple seasons.

Common

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

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1 Apply a nitrogen-rich liquid fertilizer to stimulate new foliage growth and restore leaf color.