Est. 1993Your thoughtful gesture PLANT PROBLEMS · GROWING GUIDE
A fragrant balcony is enjoyable. It should not be sold as an invisible barrier against mosquitoes or flies. Choose herbs for their growing needs and useful harvest, and tackle insect problems at their source.
By Ma Petite Fleur · Updated 4 October 2026
Basil leaves in a pot.
Photo: NeoMeesje. CC BY-SA 4.0. Original photograph on Wikimedia Commons. Resized and converted to WebP; any card crop uses the same licence. Educational illustration; plants and cultivars vary.
THE SHORT VERSION
Iowa State University Extension explains that plants promoted as mosquito repellents, including scented geraniums, lemon thyme and citronella grass, do not repel nearby mosquitoes simply by standing on a patio.
Read the full adviceGrow these plants for cooking, scent or flowers where their care requirements suit the spot.
Read the full adviceCheck the botanical label. Citronella grass and a citrus-scented geranium are different plants.
Read the full adviceIowa State University Extension explains that plants promoted as mosquito repellents, including scented geraniums, lemon thyme and citronella grass, do not repel nearby mosquitoes simply by standing on a patio. The presence of aromatic compounds in a plant is not evidence that one pot protects a room.
Grow these plants for cooking, scent or flowers where their care requirements suit the spot. Do not interpret an essential-oil experiment as proof that a living plant at the window will keep insects away. A claim about mosquitoes also does not establish protection against houseflies or compost gnats.
Check the botanical label. Citronella grass and a citrus-scented geranium are different plants. Buying by fragrance or a marketing name makes it easy to get the wrong plant, and neither is a reliable substitute for insect prevention around a home.
Empty stagnant water from containers where possible, fit appropriate screens and cover food and waste. If tiny flies appear at the compost surface, investigate moisture and identify fungus gnats rather than adding a “repellent” herb to the same shelf. Different insects need different responses.
Do not make skin treatments by rubbing crushed leaves or applying undiluted essential oils. If personal protection is needed, use an appropriate labelled repellent according to its directions. Enjoy a plant’s scent without turning it into an untested household treatment.
Timings refer to UK conditions. Check the exact species, local weather and the instructions supplied with your plant.
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