Lemon grass picked fresh out of the greenhouse is more lemony and fresh than a tired import from Thailand.
Lemon Grass is a strong herb and so is normally used sparingly. The whole leaf and stem of the grass can be used. The grass blade can be finely sliced and added to soups. The bulb can be bruised and crushed for a variety of uses.
The light lemon flavor of lemon grass blends well with garlic, chilies, and corriander and is frequently used in Thai curries as well as in seafood soups. It is also used to make tea.
Try it and see for your self.