Lemongrass can be frozen. Crush as you would before using fresh (bash with the side of a knife to soften the fibres), then chop, then freeze. From time to time while it is freezing, take the container out of the freezer and stir the contents around to separate them. Continue this process until fully frozen.

Thank you! I did not want all this lovely stuff to go to waste! I should have plenty for myself and some to give away. Oh joy!