Pampas grass develops slowly in its initial stages of growth and grows faster once it is established. For optimum growing conditions, it requires plenty of sunshine and soil that is well drained, according to Gurney's Seed & Nursery Co.
Pampas grass grows in clumps and reaches an average height range of 8 to 10 feet, according to Charles Phillips of the Columbia County News-Times. It is mainly a decorative grass that produces elongated plumes of pink, purple or silvery-white flowers. Because it is a large plant, it can sometimes outgrow the space it is in.
Enriching the soil with a fertilizer mixture of 10-10-10 makes the plant and plumes grow well. Plumes bloom in late summer or early fall. Phillips recommends pruning each spring.