Pampas Grass Soil Conditions

Drainage and Moisture

• Pampas grass tolerates both quick draining soils and those that drain poorly, as long as they don't remain wet for a prolonged period. Well-drained soils provide the optimum choice for planting since the plants are less prone to root rot and fungal problems in areas that don't attract standing water. Sandy soils that drain quickly may require more frequent watering so they don't dry out completely, especially during the drier summer months. While pampas grass tolerates mild droughts, a long period in dry soil may inhibit the plant from reaching its full size.

Soil Quality

• Rich loam soils are preferable for healthiest plant growth, but pampas tolerates most soil types. Loam soils contain high amounts of organic matter, which helps them drain well while still retaining enough water to stay moist. Pampas may grow slowly in heavy clay or overly sandy soils since the plant won't have access to the correct moisture amounts. Loam soils also provide trace nutrients to the plant from the decomposing organic matter that makes up the soil.

Fertility

• The plants require annual fertilization even when grown in high-quality soils. The fertilizer replenishes and supplements the nutrients available naturally, which leads to lush foliage growth and seed head production on the pampas grass. A spring application of a balanced fertilizer, such as an 8-8-8 blend, provides the necessary nutrients for the plant. Heavy or continual fertilization throughout summer isn't necessary.

Improving Soil

• Improving the soil before you plant the pampas grass helps ensure the young plant establishes quickly. Drainage issues are also easier to fix before planting. Adding an amendment to the soil, such as compost or peat moss, improves drainage in both soggy clay beds and dry sandy beds. A 2- to 3-inch layer of the amendment tilled into the top 8 inches of the native soil typically provides sufficient organic matter to improve drainage and natural fertility to the planting site.