Geranium macrorrhizum Yellow Leaves - Causes & Fixes

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Overwatering and Soil Compaction

Geranium macrorrhizum prefers well-drained soil; sitting in waterlogged ground leads to oxygen deprivation in the roots, causing chlorosis (yellowing) as the plant fails to uptake nutrients.

Very Common

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How to confirm: Check if the soil remains soggy several inches below the surface for extended periods after watering.

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1 Immediately stop watering and allow the soil to dry out completely to prevent further root rot.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the plant into a well-draining medium and incorporate perlite to alleviate soil compaction and improve aeration.

3 Ensure the plant is in a container with proper drainage, such as a Root & Vessel pot with an integrated drainage tray, to prevent waterlogging.

Root & Vessel Majestic Low Profile Black 8.5"

8.5" • Plastic

$14

In Stock

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Nitrogen Deficiency

A lack of available nitrogen prevents the production of chlorophyll, leading to a uniform yellowing that typically starts on older, lower leaves of the cranesbill.

Very Common

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How to confirm: Observe if the yellowing is progressing from the bottom of the plant upward toward new growth.

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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 nitrogen is being effectively transported to the roots without causing waterlogging.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Botrytis Blight (Early Stage)

High humidity and poor air circulation around the dense foliage of Dalmatian Cranesbill can trigger fungal pathogens that cause leaves to yellow and eventually develop brown spots.

Common

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How to confirm: Inspect the undersides of the yellowing leaves for fuzzy gray mold or small dark lesions.

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1 Prune and remove all yellowing or infected foliage immediately to prevent the fungal spores from spreading to healthy parts of the plant.

2 Apply an organic fungicide to protect the remaining healthy tissue and control the spread of the blight.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the dense foliage by thinning out the plant and ensuring it is not in a high-humidity, stagnant area.

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Insufficient Sunlight

While quite shade-tolerant, if this species is placed in deep, permanent shade without enough light penetration, it may struggle to maintain chlorophyll levels, resulting in pale, yellowish foliage.

Common

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How to confirm: Evaluate the light levels of your planting site and check if the plant is growing in a location with significantly less light than previous seasons.

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1 Relocate the plant to a spot with brighter, filtered light or dappled sunlight to boost chlorophyll production.

2 Supplement with a full-spectrum grow light if the area remains too dark, ensuring the light mimics natural daylight.