Sometimes applying mehndi in winter can be harmful for you. This is because henna has a cold effect and its use in this season can cause cold and cough. Apart from this, its use can also trigger allergies in people who have problems with bronchitis and asthma. In such a situation, you should avoid using henna in winters and even if you are using it, you should keep some things in mind.
You should apply Mehndi in the time of direct sunlight or say in the afternoon. This will have two benefits. At first you will not feel cold. Secondly, it will dry quickly and you will be able to stay away from the cold. Apart from this, keep in mind that avoid applying henna on hair on days when there is no sunlight. Also, try not to use it too much and instead use other things which help in blackening the hair. For example, you apply onion oil, eat Amla or apply Amla water on your hair.