Plant pampas grass seedlings 2 to 4 feet apart if you want the plants to grow dense enough to provide privacy. Pampas grass also looks nice flanking each corner of a structure. Plant it in areas that get at least eight hours of sunlight daily. Avoid planting pampas grass in full shade. It can grow up to 8 feet tall, so avoid planting it under windows that might be obstructed when it reaches its full height.
Add one pampas grass plant to a mixed border, or put it behind other plants in a small group planting.
Fertilize pampas grass with an 8-8-8 fertilizer every four months for the first year to establish the roots and foliage of the plant.
Supplement rainwater in dry climates with about 2 inches of water on your pampas grass each month. In moist climates, you shouldn't need to water your plants. They do well in moderately dry soil and don't usually require extra water.
Avoid planting anything within a 6-foot radius of the plant. Pampas grass becomes wide and quite bushy and could easily cover any nearby plants.