Muhly Grass (Muhlenbergia capillaris) is an ornamental perennial known for its striking seasonal display. It is prized for its haze of pink or purple plumes that appear in late summer and fall, creating a soft, cloud-like effect. Muhly Grass is also popular for its heat and drought tolerance once established. Careful planting ensures the grass develops a strong root system, leading to a beautiful, low-maintenance display.
Site Selection and Soil Preparation
Selecting the correct location is the first step toward a successful Muhly Grass planting. This ornamental grass requires full sun exposure to produce its most vibrant color and robust growth. Choose a spot that receives a minimum of six hours of direct sunlight each day; planting in too much shade can result in fewer flowers and weaker, floppier growth.
While the plant tolerates poor soil conditions, it thrives best in a location with excellent drainage. Muhly Grass is susceptible to root rot if the soil remains constantly saturated, making well-drained soil a necessity for its long-term health. You can test your drainage by digging a 12-inch deep hole, filling it with water, and timing how long it takes to drain completely.
A drainage rate of about one inch per hour indicates sufficiently porous soil. If the water drains much slower, the soil is considered heavy, and amendments are necessary. Before planting, incorporate coarse materials like grit, sand, or well-aged compost into the native soil to a depth of about 12 to 18 inches. This enhances the soil’s structure, allowing excess water to move away from the root zone quickly.
Step-by-Step Planting Guide
Proper spacing is important, especially when aiming for a mass planting, which yields the most dramatic visual effect. Muhly Grass typically matures to a width of 2 to 3 feet. Plants should be spaced 24 to 36 inches apart to allow for mature growth and adequate air circulation, preventing overcrowding and minimizing the risk of disease.
The planting hole should be dug two to three times wider than the root ball but no deeper than the height of the root ball itself. Digging a wide hole loosens the surrounding soil, making it easier for the grass’s fibrous roots to spread out into the native landscape. This preparation encourages rapid root establishment, which is the foundation of a healthy, drought-tolerant plant.
Before placing the grass into the prepared hole, gently loosen or “score” the outer layer of roots with your fingers or a sharp tool. This breaks the circular pattern developed in the container, signaling the roots to grow outward into the surrounding soil. Ensure the top edge of the root ball, known as the crown, is level with or slightly above the surrounding soil line to account for settling.
After positioning the plant, begin backfilling the hole with the excavated soil, tamping gently to remove air pockets that can dry out the roots. Avoid covering the crown of the plant with soil, as this can lead to rot. Firm the surface around the base of the plant to secure it in place.
Immediate Post-Planting Care
Consistent moisture is most important during the establishment phase immediately following planting. After the plant is secured, deep soak the entire area to settle the soil and thoroughly hydrate the root ball. This initial watering reduces transplant shock and initiates root growth.
For the first few weeks, the newly planted grass requires regular watering to keep the root ball and surrounding soil damp, but never soggy. Water daily for the first week, then gradually taper to every few days, depending on rainfall and temperature. This encourages the roots to grow deeply into the soil rather than remaining near the surface.
As the plant establishes, reduce the frequency of watering, shifting to deep, infrequent soakings that allow the top few inches of soil to dry out between applications. This strengthens the plant’s natural drought tolerance. Applying a light layer of organic mulch, such as shredded bark or pine straw, around the base helps regulate soil temperature and conserve moisture. Keep the mulch a few inches away from the crown to prevent moisture buildup and rot.