Zantedeschia Captain Solo Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia cultivars are sensitive to stagnant moisture; excessive water leads to anaerobic conditions in the rhizome, causing leaves to yellow starting from the base. This often results in a soft, mushy texture to the stem.

Very Common

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How to confirm: Gently press the base of the plant to see if it feels soft or hollow and check if the potting medium is saturated for long periods.

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

2 Prune away any completely mushy or decayed roots and repot the plant in a well-draining, fresh medium like Espoma Organic Potting Soil Mix to prevent further anaerobic conditions.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

As heavy feeders during their growing season, a lack of nitrogen prevents the production of chlorophyll in the large foliage of 'Captain Solo'. This manifests as uniform yellowing across older leaves.

Very Common

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

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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 can effectively uptake the new nutrients.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Temperature Stress (Cold Shock)

Calla Lilies are tropical perennials that struggle when temperatures drop below 55°F (13°C). Cold stress disrupts metabolic processes, leading to rapid chlorosis and wilting of the foliage.

Common

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How to confirm: Check if the plant has recently been exposed to drafts from windows or a sudden drop in nighttime temperatures.

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1 Immediately move the plant to a warmer environment, ensuring temperatures remain consistently above 55°F (13°C) to halt metabolic disruption.

2 Avoid further temperature fluctuations by keeping the plant away from cold drafts, windows, or air conditioning vents.

3 Monitor soil moisture closely with a 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

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Fungal Leaf Spot (Botrytis)

High humidity combined with poor air circulation around the large leaves of 'Captain Solo' can trigger Botrytis cinerea. This pathogen causes yellowing patches that may eventually develop necrotic brown spots.

Common

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How to confirm: Inspect the yellowed areas for small, dark water-soaked spots or fuzzy grey mold on the leaf surface.

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1 Apply a fungicide to treat the Botrytis infection and prevent the spread of fungal spots to healthy leaves.