Phaseolus lunatus Buttergreen Bush Sudden Leaf Drop - Causes & Fixes

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Water Stress (Drought or Waterlogging)

Lima beans are highly sensitive to moisture fluctuations; sudden leaf drop is a common defense mechanism when the plant enters survival mode due to dry soil or root suffocation from saturated conditions.

Very Common

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How to confirm: Check the soil moisture depth; if it's bone dry or muddy, you have identified the stressor.

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1 Check the soil moisture level immediately using a moisture meter to determine if the soil is bone-dry or completely saturated.

GROWIT Soil Moisture Meter - Blue

Water Meters

$12

In Stock

2 If the soil is dry, water the plant thoroughly until water drains from the bottom; if waterlogged, ensure the pot has excellent drainage and allow the soil to dry out before next watering.

Bleuhome 6-Pack 6in Plant Saucers Black

Pot Saucers

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3 To prevent future fluctuations, amend your potting mix with perlite to improve aeration and drainage.

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Temperature Shock

Buttergreen Bush varieties are sensitive to frost or extreme heat waves, which can trigger rapid abscission (leaf drop) as the plant attempts to reduce transpiration surface area.

Very Common

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How to confirm: Review recent weather logs for temperatures dropping below 50°F (10°C) or exceeding 90°F (32°C).

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1 Move the plant to a stable environment with moderate temperatures, avoiding both frost and extreme heat waves to prevent further transpiration stress.

2 Apply a liquid seaweed fertilizer to help the plant recover from environmental stress and boost nutrient uptake.

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

0.9 L • 1 pcs

$32

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3 Mulch the soil surface with organic matter to help insulate the root zone against future temperature fluctuations.

Coast of Maine Quoddy Blend Lobster & Crab Compost

28.3 L • Compost Blend

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Fusarium Wilt (Fusarium oxysporum f. sp. phaseoli)

This soil-borne fungus invades the vascular system of the Lima bean, blocking water transport and causing leaves to yellow and drop suddenly, often starting on one side of the plant.

Common

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How to confirm: Examine the stem base for dark discoloration or check if the wilting/dropping is asymmetrical across the plant.

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1 Immediately remove and destroy the infected plant and any surrounding debris to prevent the soil-borne fungus from spreading to healthy plants.

2 Sterilize all gardening tools, such as pruning shears, with alcohol to avoid spreading fungal spores to other areas of your garden.

Fiskars 5/8" Bypass Pruning Shears

Cutting Tools

$13

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3 Avoid overwatering and ensure the soil has excellent drainage by incorporating perlite or coarse sand into the planting area to reduce moisture-loving fungal growth.

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Nutrient Deficiency (Nitrogen)

A severe lack of nitrogen forces the plant to remobilize nutrients from older leaves to newer growth, leading to chlorosis and eventual premature leaf drop.

Common

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How to confirm: Look for yellowing that began specifically on the oldest, lowest leaves of the bush.

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1 Apply a nitrogen-rich organic fertilizer to replenish the soil nutrients and stop the remobilization of nutrients from older leaves.