To keep coriander fresh longer, grind it in a mixer. Then, fill it in an ice tray and place it in the freezer. You can take it out of the tray. If you store coriander like this, it will stay fresh longer. (The information in this article is based on health advice and discussions with experts. It is only general information, not personal advice. So, please consult an expert before taking any action. News-Patiala Punjabi does not endorse it.)