Pampas grass can be planted at any time of the year in the southern parts of the United States. In other areas, it should be cultivated in the spring.
Pampas grass is a quick-growing, ornamental plant that is considered invasive in some areas. In the spring, propagate it by dividing the clump with a shovel and planting each one separately. This landscaping plant needs minimal care but should be watered during a drought. Pampas grass will not survive the winter in colder climates, so it must be dug up and brought indoors. In late winter, prune the plant by cutting the branches off close to the ground so new growth will have room to develop.