Zantedeschia Captain Ventura Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Zantedeschia cultivars are sensitive to waterlogged soil; excessive moisture leads to fungal pathogens like Pythium causing root decay, which interrupts the flow of nutrients and turns leaves yellow.

Very Common

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How to confirm: Gently lift the plant from its pot to check if the rhizome or roots feel mushy and smell of decay.

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

2 Prune away all dead or rotting roots using sterilized shears and repot the plant in a well-draining, fresh medium like Espoma Organic Potting Soil Mix to prevent further fungal growth.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Switch to a more breathable substrate by incorporating Legigo Organic Leca Clay Pebbles to improve aeration and prevent future waterlogging.

Legigo 4LB Leca Clay Pebbles

Expanded Clay

$17

In Stock

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Nitrogen Deficiency

As heavy feeders, a lack of nitrogen prevents the production of chlorophyll, resulting in a uniform yellowing of older leaves starting from the base of the plant.

Very Common

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How to confirm: Observe if the yellowing follows a pattern of progressing from old growth to new growth and apply a balanced liquid fertilizer.

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1 Apply a nitrogen-rich liquid fertilizer to the soil to quickly boost chlorophyll production and restore green color to the leaves.

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 the soil to provide a slow-release source of nitrogen.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor the soil moisture levels using a moisture 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)

Calla Lilies are tropical perennials that struggle when temperatures drop below 55°F (13°C), causing metabolic slowdown and chlorosis in the foliage.

Common

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How to confirm: Check if the yellowing coincided with a recent drop in ambient temperature or a draft from a window.

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

2 Avoid placing the plant near cold drafts, windows, or air conditioning vents that could trigger further temperature fluctuations.

3 Monitor soil moisture closely with a meter to ensure the plant isn't overwatered while in a dormant, cold-stressed state.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Light Deprivation

Insufficient bright, indirect light prevents the plant from photosynthesizing efficiently, leading to pale, yellowish leaves as the plant fails to maintain energy reserves.

Common

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How to confirm: Move the plant closer to a south or east-facing window and monitor if color returns over two weeks.

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1 Relocate your Calla Lily to a spot that receives bright, indirect sunlight to boost photosynthesis and restore leaf color.

2 Supplement with a full-spectrum grow light if natural light levels remain low, ensuring the plant receives adequate energy for growth.