It is also advisable to hang an anti-insect net as soon as the vegetables come out of the soil. The safety net or protection that has been installed must remain in place until October. The mulching around carrots with absinthe, rosemary or lavender may help to keep flies away from the carrot. These plants give off an unpleasant smell.
Finally, you can prevent contamination by spraying undiluted fertilizer for onions or garlic on the roots twice a week. It will also help to fertilise the soil and take care of plants and vegetables.