Pennisetum Alopecuroides A decorative ornamental grass offering year-round interest! Pennisetum alopecuroides is also widely known as Fountain Grass, a highly decorative ornamental grass that offers year-round interest in the garden. This plant is a super low-maintenance option that forms a clump, so the perfect gap filler in empty-looking perennial and shrub borders.  The grassy foliage is neat but stays quite inconspicuous until the flower heads appear during late summer. But, once they appear, they become really striking, with spikelets adding texture and interest to the garden. Leave the decorative seedheads on your Fountain Grass plants into the autumn. Height: 150cm (59"). Spread: 120cm (47").