Zantedeschia Captain Alma Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia cultivars are highly susceptible to moisture-induced decay. Excess water in the rhizome area leads to fungal pathogens like Pythium, causing foliage to turn yellow and eventually collapse.

Very Common

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How to confirm: Check if the base of the rhizome feels soft or mushy and if the soil remains saturated for long periods.

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

2 Trim away all decayed root tissue using sterilized shears and repot the plant in a well-draining medium like a mix containing perlite or pumice to prevent future waterlogging.

3 Use a soil moisture meter to monitor the substrate, ensuring you only water when the top inch of soil is dry to avoid repeat overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

Calla lilies have high nutrient demands during their growth phase. A lack of nitrogen prevents chlorophyll production, leading to a uniform yellowing of older leaves first.

Very Common

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How to confirm: Inspect if the yellowing started on older, bottom 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 to provide a slow-release source of nitrogen.

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 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)

Yellow Calla Lilies are sensitive to sudden drops in temperature. Exposure to drafts or temperatures below 55°F (13°C) can cause the plant to enter a stress response, resulting in yellowing foliage.

Common

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How to confirm: Check if the plant is located near a cold window, air conditioning vent, or experiencing a recent temperature drop.

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1 Move your Calla Lily to a warmer, draft-free location, ensuring temperatures remain consistently above 55°F (13°C).

2 Monitor the soil moisture levels closely, as temperature fluctuations can disrupt watering needs; use a moisture meter to prevent overwatering during recovery.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a liquid seaweed fertilizer to help the plant recover from environmental stress and boost 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 Intensity Issues

While they enjoy bright light, sudden exposure to intense, direct midday sun can scorch the leaves of 'Captain Alma', causing yellow patches that may turn brown.

Common

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How to confirm: Observe if the yellowing appears as bleached or pale spots on parts of the leaf directly exposed to sunlight.

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1 Relocate your Calla Lily to a spot with bright, indirect light to prevent the sun from scorching the foliage.

2 If the plant is in a low-light area, supplement with a full-spectrum grow light to maintain healthy green leaves.