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Common pests
The most common pests that attack the Christmas cactus are fungus gnats, root mealybugs, and flower thrips. Overwatering your plant is a typical culprit, as standing water attracts these nasty pests. Make sure your Christmas cactus has enough water but not so much that the soil stays soaked.
If your plant is infested, it is best to discard it so it doesn’t affect any other plants in your home. The best prevention? Monitor the moisture level of your Christmas cactus and trim off any dead sections.
