It is superstitious belief. And, not scientifically proven fact. Some people belief that if they tie the lemon along with green chilies hung outside the door of a house or in a car, then the evils or any inauspicious happenings stay away from it. read more
Some people belief that if they tie the lemon along with green chilies hung outside the door of a house or in a car, then the evils or any inauspicious happenings stay away from it. And, brings happiness and fortune. read more
That's why they bind the following together in front of a house 1. Lemon 2. Chillies 3. Coconut / sea shell 4. A sharp thorn All the above are tied to usually to a strong string and hanged in front of a house. When a person got snake bite, Indians use the coconut / sea shell to use as a container to fill medicine using the herbs nearby. read more
The concept behind this is, if you have a very attractive possession like a newly built house, people will oggle at it jealously and make it lose its novelty/value. So, instead you yourself demean it non-destructively by hanging lemon&chillies, showing an evil face or horse shoe nailed to front door or putting a black spot on face of a cute baby. read more