How to Freeze Fresh Basil, plus recipes for using frozen basil. (I freeze mine in ice cube trays, then, once frozen, remove from the trays and store in zip lock bags. It's easy to pop a cube into a recipe and they defrost really quick)
Preserving Fresh Basil Easily in the Refrigerator with Olive Oil
Preserving fresh basil in fridge for 1 year! Layer jar with salt, olive oil, basil, repeat until full. Scoop out olive oil (which will solidify in fridge) and let come to room temperature to use the basil.