Calathea stromata Yellow Leaves - Causes & Fixes

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Improper Watering and Root Rot

Calathea stromata are highly sensitive to moisture levels; consistent soil saturation leads to anaerobic conditions that cause root decay, manifesting as yellowing foliage. This is often accompanied by a loss of turgor pressure in the leaves.

Very Common

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How to confirm: Gently lift the plant from its pot to check if the roots are dark brown and slimy rather than firm and white.

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1 Immediately remove the plant from its current pot and inspect the roots; trim away any mushy, black, or foul-smelling roots using sterilized tools.

2 Repot the plant in a fresh, well-draining medium like a mix containing perlite to ensure proper aeration and prevent future anaerobic conditions.

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

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Low Humidity

As a tropical species, this plant requires high humidity levels (above 60%). When the air is too dry, the plant struggles with transpiration, causing older leaves to turn yellow and develop crispy edges.

Very Common

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How to confirm: Place a hygrometer near the plant to check if ambient humidity is consistently below 50%.

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1 Increase local humidity by placing the plant on a pebble tray or using a fine mist spray bottle to hydrate the foliage.

Flora Premium Plant Mister

Spray Bottles

$12

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2 Monitor soil moisture levels closely to ensure the plant remains consistently moist but not waterlogged, as dry air can lead to rapid evaporation.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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3 If the plant is in a dry area, consider using a humidifier or grouping it with other plants to create a more humid microclimate.

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Salt or Mineral Accumulation

Calatheas are notorious for sensitivity to fluoride, chlorine, and salts found in tap water. Over time, these minerals build up in the leaf tissue, disrupting chlorophyll production and causing chlorosis (yellowing).

Common

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How to confirm: Look for white crusty deposits on the soil surface or burnt-looking brown edges accompanying the yellowing.

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1 Flush the soil thoroughly with distilled or rainwater to wash away accumulated mineral salts and fluoride.

2 Repot the plant in fresh, high-quality potting soil to provide a clean environment free of existing mineral buildup.

Espoma Organic Potting Soil Mix

15.1 L

$22

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3 Use a moisture meter to ensure you are not overwatering, as excess moisture can exacerbate mineral toxicity symptoms.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nutrient Deficiency (Nitrogen)

If the plant has been in the same potting medium for a long period, it may have depleted essential nitrogen. Nitrogen deficiency typically causes uniform yellowing of older leaves as the plant mobilizes nutrients to new growth.

Common

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How to confirm: Observe if the yellowing is starting specifically on the oldest, lowest leaves while new growth remains green.

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1 Apply a nitrogen-rich liquid fertilizer to replenish depleted nutrients in the soil.