Which of the following is considered an ornamental grass?

Both Festuca ovina glauca and Pennisetum alopecuroides are indeed classified as ornamental grasses, making the choice that includes both correct.

Festuca ovina glauca, commonly known as blue fescue, is valued in landscape design for its fine texture and attractive bluish-green foliage. It forms dense clumps and can be used effectively in borders, rock gardens, or as ground cover. Its aesthetic appeal and low maintenance requirements contribute to its popularity in ornamental landscaping.

Pennisetum alopecuroides, often referred to as fountain grass, is also recognized for its decorative qualities. This grass produces fluffy flower spikes that resemble foxtails, creating visual interest and movement in the garden. It thrives well in various conditions, making it a favorite for ornamental applications where height, texture, and seasonal interest are desired.

Both species exemplify the versatile uses and ornamental value of grasses in horticulture, fitting into garden designs for their beauty as well as their functionality.