Zantedeschia Captain Reno Yellow Leaves - Causes & Fixes

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Overwatering and Root Rot

Calla Lilies are susceptible to Phytophthora caused by waterlogged soil. When the rhizome stays too wet, oxygen is displaced, leading to decaying roots and characteristic yellowing of the foliage.

Very Common

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How to confirm: Check if the base of the plant or the rhizome feels soft or mushy to the touch.

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1 Immediately remove the plant from its current container and inspect the rhizome and 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 restore aeration.

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 drainage and prevent future waterlogging.

Legigo 4LB Leca Clay Pebbles

Expanded Clay

$17

In Stock

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Nitrogen Deficiency

As heavy feeders, 'Captain Reno' requires consistent nutrient availability. A lack of nitrogen prevents chlorophyll production, causing older leaves to turn uniformly yellow before progressing to new growth.

Very Common

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How to confirm: Look for yellowing that starts on the oldest, bottom-most leaves first.

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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 Exposure)

Zantedeschia species are sensitive to low temperatures. Sudden drops in temperature or frost can cause the plant's metabolic processes to stall, resulting in rapid yellowing of the leaf blades.

Common

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How to confirm: Check if there has been a recent significant drop in nighttime temperatures below 50°F (10°C).

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

2 Monitor the soil moisture closely, as cold temperatures can slow evaporation; use a moisture meter to ensure the plant is not being overwatered while in a dormant state.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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3 Once the plant stabilizes, 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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Improper Light Intensity

While 'Captain Reno' thrives in bright light, extreme direct afternoon sun can scorch the leaves, while insufficient light can cause the plant to struggle, leading to chlorotic (yellow) patches.

Common

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How to confirm: Observe if the yellowing is accompanied by dry, crispy brown patches on the leaf surfaces.

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1 Relocate your Calla Lily to a spot with bright, indirect light to prevent leaf scorching while ensuring it receives enough energy for photosynthesis.

2 If the plant is in a low-light area, supplement with a full-spectrum grow light to stabilize energy production and stop yellowing.