If you need to store fresh herbs, trim the stems then place them into a jar with about an inch of water in the bottom. If you need to refrigerate the herbs, place a plastic bag over the herbs/jar and then refrigerate. However, basil can be stored in the refrigerator in a plastic bag for approximately one week; make sure the basil is relatively dry before placing it in the bag. Many herbs can also be frozen for later use.
Important: If you notice any moisture in the airtight containers or sealed plastic bags after storing the dried herbs–this is a sign that moisture was still present when packed. Mold can develop because of the moisture, so make sure the herbs are thoroughly dried and have absolutely no moisture left in them.
One teaspoon of dried herbs is equivalent to 1 tablespoon of fresh.
Here are 10 Easy Ways to Preserve Herbs!