- To successfully overwinter pampas grass in the garden, it's best to tie the tuft of leaves together from bottom to top. - Every 15-20 inches (40 to 50 cm), tie a rope. - The root area is then covered with dried leaves and brushwood. - Pampas grass should overwinter in a container and be placed in a protected spot on an insulating mat.  - You need to tie the tuft of leaves together and cover the root area with straw, leaves, or wood.  - Finally, wrap the Pampas plant container in a thick coconut mat, fleece, jute, or bubble wrap.