How to best keep a bunch of coriander fresh?

I bought this bunch of coriander at my local fruit shop. What is the best way to keep it fresh as long as possible? I usually cut off about 1 cm of the stems and then put them into a glass of water, at room temperature. I wonder if I would be better off putting them into the fridge, with or without the water. Or if there is another option I'm unaware of.