Lilium OT Big Brother Yellow Leaves - Causes & Fixes

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Overwatering and Poor Drainage

Lilium OT 'Big Brother' requires well-draining soil; excessive moisture causes root hypoxia, which prevents the bulb from transporting nutrients, leading to chlorosis in lower leaves.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it remains soggy for extended periods.

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

GROWIT Soil Moisture Meter SMM-V3

Water Meters

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2 Repot the lily in a well-draining medium, incorporating perlite to improve aeration and prevent water pooling.

3 Ensure the plant is in a container with adequate drainage holes and use a saucer to catch excess water, emptying it after use.

Bleuhome 10" Plant Saucer 6-Pack Black

Pot Saucers

$20

In Stock

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Nitrogen Deficiency

As large-flowered Oriental hybrids, these lilies have high nutrient demands during their growth phase; a lack of nitrogen prevents chlorophyll production in older leaves.

Very Common

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How to confirm: Observe if the yellowing started on the oldest, bottom leaves and is progressing upward toward the stem.

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

FoxFarm Grow Big Liquid Plant Food 1 Quart

0.9 L • 1 pcs

$30

In Stock

2 Supplement the soil with an organic nitrogen source like blood meal to provide long-lasting nutrition.

Back to the Roots Organic Blood Meal

Organic Fertilizer

$10

In Stock

3 Monitor soil moisture levels with a meter to ensure the nitrogen is being effectively absorbed by the roots.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

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Botrytis Lilianum (Lily Blight)

Fungal pathogens thrive in humid conditions around lily foliage, causing leaf discoloration and eventual necrosis, often starting as pale or yellow patches.

Common

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How to confirm: Inspect the undersides of the yellowing leaves for small brown spots or fuzzy grey mold growth.

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1 Remove and destroy all infected, yellowing leaves immediately to prevent the fungal spores from spreading to healthy foliage.

2 Apply an organic fungicide to the affected plant 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 lily and avoid overhead watering to reduce the humidity that allows the blight to thrive.

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Bulb Rot (Fusarium oxysporum)

Soil-borne fungi can attack the base of the 'Big Brother' bulb, restricting vascular flow and causing the entire foliage mass to turn yellow.

Common

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How to confirm: Gently excavate a small area around the base of the stem to check if the bulb feels soft or smells foul.

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shopping_cart Recommended Products

1 Immediately remove the plant from its current container and inspect the bulb for soft, mushy, or dark areas indicative of rot.

2 Discard any infected bulb material and repot the remaining healthy parts in a fresh, well-draining medium like Espoma Organic Potting Soil Mix to prevent further fungal spread.

Espoma Organic Potting Soil Mix

15.1 L

$22

In Stock

3 Improve drainage by adding horticultural perlite to the soil mix and ensure the plant is in a pot with adequate drainage holes to prevent waterlogged conditions.