Kalanchoe Passion Castalia Tiny Black Flies - Causes & Fixes

Jump to cause: Fungus Gnats Overwatering and Soil Moisture Imbalance High Organic Matter in Potting Mix

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Fungus Gnats

The tiny black flies are likely the adult stage of fungus gnats, which thrive in the moist, organic-rich soil preferred by Kalanchoe. Their larvae feed on decaying organic matter and can damage the delicate root hairs of your Passion Kalanchoe.

Very Common

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How to confirm: Set up a yellow sticky trap near the plant to confirm if small flying insects are being captured.

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1 Deploy yellow sticky traps to capture the adult flying gnats and break the reproductive cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

2 Allow the top inch of soil to dry out completely between waterings to make the environment less hospitable for larvae.

GROWIT Analog Soil Moisture Meter

Water Meters

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3 Apply a biological control or organic insecticide to target the larvae living in the soil.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

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Overwatering and Soil Moisture Imbalance

Kalanchoe Passion Castalia is a succulent that requires well-draining soil; constant moisture attracts gnats by providing a breeding ground for larvae. Excess water also leads to root rot, which creates the decaying organic matter these flies feed on.

Very Common

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How to confirm: Stick your finger two inches into the soil to see if it remains damp long after a scheduled watering.

build How to fix it

shopping_cart Recommended Products

1 Reduce watering frequency and allow the soil to dry out completely between waterings to eliminate the breeding ground for larvae.

GROWIT Soil Moisture Meter SMM-V3

Water Meters

—

2 Apply yellow sticky traps near the soil surface to capture the adult flies and disrupt their life cycle.

Super Ninja Fungus Gnat Traps - 30 Pack

30 pcs

$7

In Stock

3 Repot the Kalanchoe in a well-draining succulent mix amended with perlite to improve aeration and prevent future moisture imbalance.

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High Organic Matter in Potting Mix

If your potting medium contains too much peat moss or compost, it provides an ideal nutrient source for fly larvae. Kalanchoes perform best in gritty, low-nutrient substrates that dry out quickly.

Common

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How to confirm: Examine the soil texture to see if it is overly spongy or holds water much longer than typical succulent mixes.

build How to fix it

shopping_cart Recommended Products

1 Apply a biological insecticide to eliminate the adult flies and larvae in the soil.

Bonide Captain Jack's Neem Oil 32 oz

0.9 L • 1 pcs • Organic

$10

In Stock

2 Repot the Kalanchoe in a well-draining, gritty substrate like a mix of perlite and cactus soil to reduce organic food sources for the flies.

Legigo Perlite 15qt