Cycas circinalis Yellow Leaves - Causes & Fixes

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Nutrient Deficiency (Magnesium or Nitrogen)

Cycas circinalis is a heavy feeder and frequently develops chlorosis due to insufficient magnesium or nitrogen in the substrate. Magnesium deficiency typically manifests as yellowing between the veins of older fronds first.

Very Common

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How to confirm: Observe if the yellowing starts on the tips or midribs of the oldest, outermost leaves.

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1 Apply a liquid seaweed fertilizer to boost overall nutrient uptake and provide essential trace minerals.

FoxFarm Bush Doctor Kelp Me Kelp You Liquid Seaweed Fertilizer 1 Quart

0.9 L • 1 pcs

$32

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2 Supplement the soil with a nitrogen-rich organic amendment to address potential nitrogen deficiency and promote green foliage.

Back to the Roots Blood Meal & Gypsum (4 Pack)

Organic Fertilizer

$40

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3 Check the soil moisture levels using an analog meter to ensure the deficiency isn't being exacerbated by improper watering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Improper Watering (Root Stress)

Excessive moisture leads to hypoxia in the root system, causing yellowing across the entire frond. Conversely, extreme drought stress can cause the tips of the circinalis leaflets to turn yellow and then brittle.

Very Common

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How to confirm: Stick your finger two inches into the soil to check if it is waterlogged or bone dry.

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1 Check the soil moisture level immediately using a moisture meter to determine if the roots are currently waterlogged or bone-dry.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 If the soil is overly saturated, repot the Cycas circinalis in a well-draining medium amended with perlite to improve aeration and prevent root hypoxia.

3 Ensure the plant is in a pot with adequate drainage and use a saucer to prevent water from pooling around the base of the trunk.

Bleuhome 10" Plant Saucer 6-Pack Black

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Salt Accumulation (Salinity Stress)

Accumulation of fertilizer salts or hard water minerals in the potting medium can cause leaf burn and yellowing. This species is sensitive to high concentrations of sodium and chloride in the rhizosphere.

Common

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How to confirm: Check for a white, crusty buildup on the soil surface or the edges of the pot.

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1 Flush the potting medium thoroughly with distilled or rainwater to leach out accumulated mineral salts and sodium.

2 Check the current moisture levels to ensure the soil is not staying waterlogged, which can exacerbate salt toxicity.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Repot the plant in fresh, well-draining substrate and consider adding perlite to improve aeration and drainage.

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Fungal Root Rot (Phytophthora spp.)

Pathogenic fungi can attack the fleshy roots of Queen Sago Palms in poorly draining soils. This systemic failure prevents water transport, resulting in widespread yellowing and eventual drooping of fronds.

Common

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How to confirm: Gently lift the plant from its pot to inspect if the roots are dark, slimy, or foul-smelling.

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shopping_cart Recommended Products

1 Immediately remove the plant from its current container and inspect the roots for mushy, dark, or foul-smelling decay; prune away all infected root tissue using sterilized tools.

2 Repot the Cycas circinalis in a highly well-draining medium, incorporating perlite or horticultural grit to prevent future water stagnation.

3 Apply a fungicide treatment to the root zone and ensure the new pot has excellent drainage, using a saucer to prevent the plant from sitting in excess water.