Each Lemongrass bush is a number of many smaller lemongrass plants as can easily be seen on the first picture. Hence you break one of the small lemongrass bundles away from the plant - take as much as you need and leave the plant growing in the garden.
Lemongrass can be used manifold in our kitchen.
Lemongrass tea
Lemongrass in soups, specially fish soups are delicious with one bundles of lemongrass per person
Lemongrass is a firm ingredient of the traditional Thai curry paste
Using Lemongrass - crunch it before adding it to soups or other dishes or as for the Thai curry paste crush the lemon grass in your mortar.
Lemon grass also is used as insect repellent and air freshener or use lemon grass in your bathtub for a refreshing bath to refresh youth and beauty.