Dr. Theresa Dellinger of Virginia Tech's Insect Identification Lab says different lavender species and hybrids contain varying levels of plant compounds, which can influence how well they repel insects.

Research cited by The Spruce found that a 20% lavender essential oil solution mixed with water or unscented lotion could repel mosquitoes for up to eight hours. However, simply growing lavender plants is generally less effective.

Other repellents may work better, and many lavender-scented products contain too little essential oil to provide meaningful protection.

Fresh, lush lavender in full bloom. Photo from Pexels

Dellinger also warns against applying undiluted lavender oil or homemade mixtures directly to the skin because they may cause irritation. She recommends using properly formulated products and following label instructions for safe application and reapplication, according to Southern Living.

Lavender also has the opposite effect on some insects. Its flowers are rich in nectar and pollen, making them attractive to bees, butterflies, wasps and certain flies.

"Don't plant lavender near areas where people sit or eat if buzzing insects are a concern," Dellinger advised.