Extension Logo
Extension Logo
University of Minnesota Extension
https://extension.umn.edu

Managing insects on indoor plants

Quick facts

  • Choose healthy plants with growing requirements that match the indoor environment.
  • Proper plant care can minimize pest issues, reducing the need for chemicals.
  • Examine plants regularly for insects.
  • If pests are detected, isolate the plant from others.
Several healthy, green plants placed next to a bright window
Sufficient light is important for healthy plants

Healthy plants have fewer pest problems

Prevent, or at least minimize, pest issues on indoor plants by choosing the right plants and providing good overall plant care. Learn about basic care and growing needs for your plant.

Grow plants in the best possible conditions

  • Select plants with growing requirements that match the indoor environment (humidity, light, temperature).
  • Plants cannot fight off pests when they are struggling to grow in too little light, overly wet or dry soil, too hot or too cold air temperatures, etc.

Water plants properly

  • Know how much water your plant needs.
  • Water the soil at the base of the plant, not the leaves.
  • Be sure the plant's pot drains well.
    • Avoid letting plants stand in water.
    • Over-watering and poor drainage can cause root rot and encourage fungus gnats as well as other pest issues.
Dead, brown leaves being removed from the soil of a healthy potted plant
Remove dead leaves and flowers

Understand your plant’s nutritional needs

  • Apply fertilizer at half the recommended strength.
  • Fertilize when the plant is actively growing.

Keep plants clean

  • Keep soil surface free of dead leaves, stems and flowers.
  • Wash plant leaves with a damp cloth as dust and grime can reduce plant health.  Never use leaf shine products or milk.
  • Prune out dead branches and stems.

Use new, sterile potting soil when potting plants

  • Never pot indoor plants using soil from the garden.
  • Avoid using soil from open bags of potting soil that have sat outside for potting indoor plants. Save it for your outside pots.
  • Plant in clean pots and wash soil off of plant roots.
The clean underside of a healthy, green leaf
Check undersides of leaves

Early detection is key to managing pests

Finding pests before they become a problem is the best way to keep insects at bay.

  • Thoroughly examine all plant parts and containers before bringing them home from the store or indoors for the winter.
    • You may need to use a magnifying lens as some pests are very small.
  • Inspect tops and undersides of leaves for insects, webbing, holes and eggs.
    • Examine leaves that are discolored as this may be evidence of a pest problem.
      • A ten-power hand magnifying lens is helpful when looking for pests. There are also magnifier apps for smart phones.
Small, shiny, sticky spots on greenish-yellow leaves
Honeydew on hoya
  • Watch for honeydew, a shiny, sticky substance made by aphids, mealybugs and scale insects found on the upper surface of leaves as well as on table tops and other items around and under the plant.
  • Check plant containers for signs of pests along edges, rims, the bottom of pots, saucers, crevices. Remove if found.
  • Isolate newly acquired plants for one to two weeks to allow any possible pest problems to become visible.
  • Check for pests when you water, fertilize or clean plants.
    Two yellow sticky cards hung above some green plants. Tiny, black flies can be seen trapped on them.
    Yellow sticky card trapping flies
  • Use yellow or blue sticky traps to detect flying insects like whiteflies, fungus gnats, winged aphids and thrips.  

How to manage insects on indoor plants

 | 

Managing common pests

 | 

Jeff Hahn, Extension entomologist and Julie Weisenhorn, Extension educator

Reviewed in 2018

Share this page:

© 2019 Regents of the University of Minnesota. All rights reserved. The University of Minnesota is an equal opportunity educator and employer.