Mums are a natural source of the chemical pyrethrin -- an organic pesticide.
Mosquitoes are drawn to dark colors, moisture, carbon dioxide sources, fragrant perfumes or lotions and scented hair-care products. The allure of these items can be minimized with repellents. There are chemicals that effectively keep mosquitoes at bay, but those who are seeking a gentler option often turn to aromatic plants. Several popular gardening plants, including the late-blooming, cold-hardy mum, produce an aroma that deters mosquitoes. Does this Spark an idea?
Chrysanthemums
The long-blooming mum's large flowers seem impervious to chilly overnight temperatures and light frosts. They remain in bloom for up to 12 weeks. Colors range from rust red and light yellow to pale pink and white. The plant's shapes can be low and gently-rounded or tall and upright. Mums make an excellent addition to informal gardening beds and landscaping borders. However, they also are well-suited to life in pots or planters. Those who are planting mums for pest control might prefer plants in containers because this means the plants can be relocated where they would be most useful.
Pyrethrin
Chrysanthemums are a natural source of pyrethrin, a toxic compound that kills bugs on contact. In the garden, the presence of this chemical helps chrysanthemums repel most insects. To ward off mosquitoes and other biting bugs, pick a chrysanthemum blossom and rub the petals over skin and clothing. Evenly distribute the flower's fragrance over vulnerable areas. Homeowners or gardeners who require larger amounts of pesticide will find that pyrethrin is sold at garden centers. Pyrethirn sprays and foggers frequently are used to eliminate destructive pests such as the Colorado potato beetle, flies, aphids, gnats and cabbage loopers.
Other Repellent Plants
Chrysanthemums bloom in the fall. While they add a welcome dash of late-season color to a garden, blood-thirsty bugs begin making their rounds in the late spring and continue buzzing through the atmosphere through late fall. To help keep mosquitoes at bay all summer, plant a variety of naturally repellent flowers and herbs such as lemon grass, chamomile, geraniums and lavender. An assortment of plants that bloom consecutively also will provide more complete coverage than a single type of flower.
Pyrethrin Warnings
When consumed in large quantities, plant materials and natural insect repellents such as pyrethrin can lead to digestive upset, diarrhea, vomiting, seizures, paralysis or even death. In the event of accidental ingestion, observe the afflicted individual and if symptoms develop, seek professional medical attention. Additionally, those with sensitive skin might experience redness, itching, tingling or irritation. Wash the affected area immediately under a stream of cold, running water.
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