Preventing & Managing Houseplant Pests and Diseases

Prevention beats cure. Clean practices, regular feeding, and sharp observation stop most infestations and infections before they spread.

Prevention

• Buy only healthy plants; quarantine questionable ones.
• Inspect during watering: remove dead flowers, check for issues.
• Use sterile potting mix; never take cuttings from sick plants.
• Feed regularly (balanced diet = resilience) but avoid overfeeding (toxic soil).
• Stop feeding summer bloomers after late summer—prevents soft growth vulnerable to pests/diseases during dormancy.

Cultural Red Flags

• Variegation loss = low light.
• Bud drop = dry air/soil or low light.
• Leaf curl/drop = drafts.
• Crispy lower leaves = dry soil or excess heat.
• White pot crust = overfeeding or hard water.
• Leaf holes = physical damage (pets/people).
• Wilting = too dry OR too wet.
• Brown spots = sunburn on water drops or leaf spot disease.
• Green slime on pots = overwatering.

Common Pests & Diseases

Pests: Aphids, Caterpillars, Cyclamen mites, Earwigs, Eelworms, Mealybugs, Red spider mites, Root mealybugs, Scale, Thrips, Whiteflies.

Diseases: Black leg, Botrytis, Leaf spot, Powdery mildew, Root rot, Rust, Sooty mold, Viruses.

Treatment Options

• Spray diluted insecticide (most popular).
• Ready-to-use liquid sprays.
• Systemic soil drenches or fertilizer sticks.
• Dusting (effective but messy—do outdoors).

Nip problems in the bud—weekly vigilance saves collections.