Lemon grass doesn't dry well--the flavor goes away--but it does freeze well.

On the other hand, the living plant doesn't take freezing temperatures well at all! Better to take it indoors to a sunny window, or a frost-free conservatory or greenhouse. Keeping it that way, it's best to keep it green

Thanks for that....shall do it tomorrow.

If it does die back, just cut it off and it will grow again next year. Mine does that and in January, I cut down, but remember I live in a warmer place and I suspect it could really use even more warmth (which is why it's used in Thai cooking). But definitely keep it inside during the cooler temps. And it will get bigger, so think about a larger pot in the spring.