Tiny Bugs, Big Trouble: The 5-Minute Houseplant Check

Start with the undersides

Once a week, turn a few leaves over and look along veins, where leaves meet stems, and around fresh growth. Use a flashlight or phone magnifier. Check the pot rim and saucer, too. Early detection makes a real difference.

Know the common warning signs

Fine webbing and pale stippling can indicate spider mites. White cottony clumps around leaf joints suggest mealybugs. Brown, shell-like bumps on stems may be scale. Sticky residue can be honeydew from sap-feeding pests. Small flying insects around moist potting mix may be fungus gnats.

The white-paper test

Hold a white sheet of paper beneath a suspicious leaf and tap gently. Tiny moving specks can indicate mites. The test isn't a complete diagnosis, but it helps you notice pests that are difficult to see with the naked eye.

What to do when you find something

Move the affected plant away from others. Photograph the problem, identify the pest, and gently rinse or remove visible insects when appropriate. Follow university extension guidance and use only treatments labeled for indoor plants and the specific pest. Reinspect regularly; a single cleaning may not solve the problem.

Inspect new plants before bringing them home

Check both sides of leaves, stems and potting mix before purchasing or unpacking a new houseplant. Keeping new plants separate for a week or two gives you time to spot emerging pests. Make inspection part of your normal watering routine.