Ornamental fine fescues like ‘Elijah Blue’, are strong bunch grasses, but they often self-seed. Look closely in between the green plant in the center of the photo (Festuca valisacia ‘Glaucantha’ and the blue fescue on the right. Many new plants are growing from seed. While the original parent plant can die, often due to heavy soils and poor drainage, small seedling plants grow quickly and make a mass of individual plants. Due to the green color of the foliage, these seedlings are likely from ‘Glaucantha’.