Can Carnivorous Plants Control Horse Flies Indoors?

Trish in northwestern New Jersey faces 4–8 horse flies in her house at any time, thanks to a nearby horse farm. She hopes a carnivorous plant might reduce the numbers without her having to kill them herself. Her west-facing windows receive direct sun.

The Short Answer: Not Really

Jeff Dallas is blunt: "Carnivorous plants can help a little, but are mostly not useful for insect control." Horse flies are blood-feeders attracted to animal scent, not the sugar lures pitcher plants use. Even with thousands of plants at their nursery, bugs persist. To see any effect, you'd need hundreds of plants—and still might not notice a difference.

If You Want to Try Anyway…

American pitcher plants (Sarracenia) are the best fly catchers. Good candidates include:

• S. alata
• S. leucophylla 'Tarnok'
• S. flava
• Hybrids: 'Alatamin', 'Judith Hindle'

All require full sun, pure water, and a winter dormancy. See care sheets for details.

Better Alternatives

For actual horse fly control, consider screens, traps baited with CO₂ or animal odors, or encouraging natural predators (birds, dragonflies). Carnivorous plants are fascinating companions, not pest-control devices.