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Citronella oil—known for its use in insect-repelling patio candles—comes from the lemongrass plant, so it’s not surprising that the ornamental grass itself can deter mosquitoes with its strong fragrance. To double up on pest-fighting abilities, plant lemongrass around the patio and use citronella candles when the bugs are especially bad. Grown as an annual, this grass reaches up to four feet tall during the season and does quite well in containers.
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