Lilium lancifolium Yellow Leaves - Causes & Fixes

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Botrytis Lilianum (Lily Blight)

This fungal pathogen thrives in humid conditions and causes leaves to turn yellow before developing brown necrotic spots. In Tiger Lilies, it often starts at the leaf tips or edges during moist weather.

Very Common

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How to confirm: Inspect the yellowed areas for fuzzy gray fungal growth or water-soaked lesions.

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1 Remove and destroy all infected leaves and plant debris to prevent the fungal spores from spreading to healthy tissue.

2 Apply an organic fungicide to the affected areas to control the spread of the Botrytis pathogen.

Bonide Captain Jack's Copper Fungicide 32 oz

0.9 L • 1 pcs • Organic

$12

In Stock

3 Improve air circulation around the plant and avoid overhead watering to reduce the humidity that promotes Lily Blight.

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Overwatering and Poor Drainage

Tiger Lilies prefer well-draining soil; excessive moisture leads to oxygen deprivation in the rhizomes, causing systemic yellowing of lower leaves. This often precedes rhizome rot.

Very Common

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How to confirm: Stick your finger 2 inches into the soil to check if it remains saturated for long periods.

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1 Immediately reduce watering frequency and ensure the plant is in a container with adequate drainage holes to prevent water from pooling around the rhizomes.

Root & Vessel Majestic Low Profile Black 6.5"

6.5" • Plastic

$11

In Stock

2 Repot the Lily into a fresh, well-draining medium enriched with perlite or horticultural grit to improve aeration and prevent future root rot.

3 Use a soil moisture meter to monitor the substrate, ensuring you only water when the top inch of soil is dry to avoid further oxygen deprivation.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Nitrogen Deficiency

A lack of nitrogen prevents the plant from producing chlorophyll, resulting in a pale yellow color that typically moves from the older, bottom leaves toward the top of the stem.

Common

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How to confirm: Check if the yellowing is uniform across the entire leaf surface and begins specifically on the oldest foliage.

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1 Apply a nitrogen-rich liquid fertilizer to boost chlorophyll production and restore the green color to the foliage.

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Supplement the soil with organic worm castings to provide a slow-release source of nitrogen and improve overall soil health.

Back to the Roots Organic Worm Castings 5lb

Worm Castings

$17

In Stock

3 Monitor the soil moisture levels regularly using a moisture meter to ensure nitrogen uptake is not being hindered by overwatering.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Natural Senescence

As the Tiger Lily completes its blooming cycle, it is biologically programmed to transport nutrients from the leaves back into the rhizome for dormancy. This causes the foliage to yellow and die back naturally.

Common

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How to confirm: Observe if the flowers have already finished blooming and if the rest of the plant appears healthy.

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1 Allow the foliage to die back naturally and avoid cutting the yellow leaves until the entire plant has turned brown, ensuring all nutrients return to the rhizome.

2 Once the foliage is completely brown and dormant, carefully prune the dead stems at the base of the plant to prepare the rhizome for storage.