Zantedeschia Captain Romance Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia cultivars are highly susceptible to rhizome rot if the growing medium remains saturated. Excess moisture deprives the roots of oxygen, causing leaves to turn yellow and eventually collapse.

Very Common

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How to confirm: Gently lift the rhizome from the soil to check if it feels mushy or smells of decay.

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1 Immediately remove the plant from the saturated soil and inspect the rhizome for mushy, dark, or foul-smelling rot.

2 Prune away any completely decayed roots and repot the plant in a well-draining, fresh medium like Espoma Organic Potting Soil Mix to ensure proper aeration.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Use a moisture meter to monitor the soil and ensure you only water when the top inch of soil is dry, preventing future saturation.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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Nitrogen Deficiency

As heavy feeders during their growing season, Calla Lilies require consistent nutrient availability. A lack of nitrogen prevents chlorophyll production, leading to uniform yellowing of older leaves.

Very Common

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How to confirm: Check if the yellowing started on older, lower leaves and consider applying a balanced liquid fertilizer.

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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

In Stock

3 Monitor soil moisture levels with a meter to ensure the plant can effectively uptake the newly provided nutrients.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Stress (Cold Shock)

Zantedeschia 'Captain Romance' is sensitive to low temperatures. Sudden drops in temperature or exposure to frost can cause the metabolic processes to stall, resulting in chlorosis.

Common

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How to confirm: Verify if the plant was recently moved to a drafty area or exposed to night temperatures below 50°F (10°C).

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1 Immediately move the plant to a warmer, draft-free environment to stabilize its temperature and prevent further metabolic stalling.

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Once the plant stabilizes, apply a mild liquid fertilizer to help restore vigor and nutrient uptake.

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

0.9 L • 1 pcs

$32

In Stock

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Light Deprivation

While not shade-tolerant, extreme direct midday sun can scorch leaves, while too little light leads to weak, pale, and yellowing foliage as the plant fails to photosynthesize effectively.

Common

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How to confirm: Observe if the yellowing is accompanied by localized bleached patches or if the stems are becoming excessively leggy.

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1 Relocate your Calla Lily to a spot with bright, indirect sunlight to ensure it can photosynthesize without being scorched by midday sun.

2 If the plant is in a low-light area, supplement with a full-spectrum grow light to provide the necessary energy for healthy green foliage.