Geranium Yellow Leaves - Causes & Fixes

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Overwatering and Poor Drainage

Zonal Geraniums are highly susceptible to root rot when kept in soggy soil. Excess moisture displaces oxygen in the rhizosphere, causing leaves to turn yellow, often starting with the lower, older foliage.

Very Common

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How to confirm: Stick your finger two inches into the soil; if it feels saturated and smells slightly sour, you are overwatering.

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1 Immediately stop watering and allow the soil to dry out completely. Use a moisture meter to monitor the soil depth and ensure the root zone is not staying saturated.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the geranium into a container with superior drainage, such as a Root & Vessel cylinder pot, and use a well-draining potting mix amended with perlite to improve aeration.

3 Inspect the roots for any mushy, dark brown, or foul-smelling rot; prune away any damaged roots using sterilized shears to prevent the spread of decay.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

In Stock

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Nitrogen Deficiency

Geraniums have a high demand for nutrients during their active growing season. A lack of nitrogen prevents the production of chlorophyll, leading to a uniform yellowing across the entire leaf surface.

Very Common

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How to confirm: Observe if the yellowing is spreading from older leaves to new growth and check if you have used a balanced N-P-K fertilizer recently.

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1 Apply a nitrogen-rich liquid fertilizer to provide immediate nutrient uptake and restore chlorophyll production.

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 soil moisture levels with a meter to ensure the plant can effectively absorb the newly applied nutrients.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Spider Mites Infestation

These microscopic pests pierce plant cells to suck out sap, which disrupts photosynthesis. This results in a 'stippled' yellow appearance or general chlorosis on the leaf surface.

Common

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How to confirm: Hold a white piece of paper under a leaf and tap it; if tiny moving dots fall onto the paper, you have mites.

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1 Apply an organic insecticide to eliminate the spider mite population and protect healthy plant tissues.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

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2 Wipe down leaves with a damp cloth or use a fine mist to physically dislodge mites from the undersides of foliage.

Flora Premium Plant Mister

Spray Bottles

$12

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3 Monitor the soil moisture levels to ensure the plant is not under additional stress from overwatering, which can exacerbate yellowing.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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Temperature Stress (Cold Shock)

Zonal Geraniums are tropical perennials that thrive in warmth. Exposure to temperatures below 50°F (10°C) can cause metabolic disruption, leading to yellowing and drooping of the foliage.

Common

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How to confirm: Check if the plant was recently moved outdoors or exposed to a cold draft near a window.

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1 Move your Geranium to a warmer, stable environment, ensuring temperatures remain consistently above 50°F (10°C) to prevent further metabolic disruption.

2 Monitor soil moisture closely using a moisture meter, as temperature fluctuations can alter evaporation rates and lead to secondary issues like root rot.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

3 Apply a balanced liquid fertilizer to help the plant recover from the stress and rebuild nutrient reserves.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock