Tuesday, November 12, 2013

Ornamental Grasses Enhance Fall Landscape

Bob Henrickson
          Ornamental grasses are key plants in the natural landscape—providing seasonal beauty with colors and textures only they can provide. Many gardeners are discovering the many benefits ornamental grasses bring to the garden while creating a more diverse and adaptable landscape for the Great Plains. There is an ornamental grass for any garden situation. They are very easy to grow when provided a well-drained soil and sunny conditions. Ornamental grasses are generally free of garden pests and require little, if any irrigation once they’re established. Perhaps no other group of plants can offer such a huge array of textures, forms, sizes and colors as grasses. Make plans to include a few of the following ornamental grass selections in your garden next spring and transform your landscape into a array of long linear leaves and fine stems.
Native Grasses of the Great Plains
Pawnee big bluestem
Junegrass, Prairie (Koeleria pyramidata) native, cool season bunch grass with gray-green leaves; blooms early June with narrow, erect seed heads; needs well-drained, dry soils; can be short-lived in heavy soils; will reseed making them ideal for naturalizing; 18” high.
Grama,  Blue (Bouteloua gracilis) native to dry prairies; tufted with thin, wiry leaves to 8”; 1” eyelash-like seed heads top thin stems to 18” in late June; nice decorator plant or mass for prairie style lawn.
Grama, Sideoats (Bouteloua curtipendula) mounds of gray-green foliage; numerous narrow flower stalks with oatlike seed heads held on one side of the stems, to 3’ h; bronze-orange fall color; straw in winter.
Buestem, Big (Andropogon gerardii) impressive native of the tall grass prairie; rich, green leaves to 2’ by the end of June; flowering stalks in August up to 6’ high; seed heads resemble turkey’s foot; reliable fall color in copper, rich orange, with maroon tones; may grow floppy if shaded; wet or dry soils.
Indiangrass (Sorghastrum nutans) clump former with blue-green leaves and golden, feathery seed heads held above leafs in fall to 6’ high; seed heads move with the slightest breeze;  provide moisture retentive soils for best results; they will reseed.
Lovegrass, Sand (Eragrostis tricoides) native to sandy soils with leafy upright flowering stems to 4’ h; masses of airy, fine textured seed heads in August; self sows manageably in loam and readily in sand but easily managed; early spring green appreciated;  will be floppy in shady conditions or excess water
Dropseed, Prairie (Sporobolus heterolepis) native bunch grass with thin, ribbon-like leaves form 2’ mounds; delicate seed heads appear in late summer and remain attractive through fall; attractive when back lit and scented; foliage turns deep orange to light copper; likes it dry and never needs dividing.
Bluestem, Little (Schizachrium scoparium) dependable native bunch grass with fine-textured bright green or light blue leaves to 2’ tall in summer; the late summer flowers dry in fall, becoming silvery and remain attractive through winter; avoid highly fertile soils or excessive moisture, heavy mulching.
Switchgrass (Panicum virgatum) many nice selections of this dependable native; ‘Shenandoah’ tight clump to 4’ with red in the summer foliage; ‘Dallas Blues’ outstanding tall plumes in fall; ‘Heavy Metal’ nice blue-gray foliage; leaves with nice orange-yellow fall color.
Hardy Exotic Grasses
Blue Fesque, Dwarf- (Festuca glauca)
Lovely bunch grass with powder blue foliage to 10”; ‘Elijah Blue’ is the most dependable; must have full sun and well-drained soils for longevity in the garden; native to Europe.
Carex or Sedge- many exciting yellow and white variegated forms selected from plants native to Japan and China. many different grass-like plants in wide variety of color, form, and size for wet or dry soils, sun or shade; there is a Carex for any garden situation; too little known and too little used! Carex grayii and Carex muskingumensis perfect for the bog.
Hairgrass, Tufted (Deschampsia caespitosa) look like tufts of long, thin hair topped by masses of loose, airy seed heads in late spring; consistent moisture for best performance; full sun to part shade; 15-18” high and wide; native to Europe.  
Miscanthus- showy grasses of many shapes and sizes, ranging from 3 to 12’ tall; feathery plumes top plants in fall with new cultivars providing colorful foliage and better flowers; cut back to ground in spring; prefers full sun and will topple if planted in too shady of conditions. ‘Autumn Red’ 3-4’ early bloomer with fall color; ‘Malepartus’ showy seed heads, early; ‘Strictus’ with yellow bands on the foliage;
Oatgrass, Blue (Helictotrichon sempervirens) a western Mediterranean native; clump-forming grass with intense blue leaves to 2’; delicate flower stalks appear in late spring; suffers in poorly drained soils. Zone 4.
Pennisetum, Chinese (Pennisetum alopecuroides) narrow-leaved bunch grass with foxtail-like silvery-white plumes in late summer; typically 2-3’ high; stunning in groups or masses; native to China.
Ravennae Grass (Saccharum ravennae) native to the Mediterranean region; clumping grass forming 4’ wide gray-green mounds of foliage by August; large plumy flower heads are produced in late August on stalks up to 12’ tall; excess moisture or fertility encourages lax growth; cut to ground in spring.
Reed Grass, Feather (Calamagrostis x acutiflora) deep green, lustrous foliage with loosely feathered flowering stalks in early summer; they constrict to narrow buff-colored plumes by fall and remain attractive all winter; easy to grow in most soils, but best in well-drained fertile soils; native to Europe. ‘Karl Foerster’ is a popular selection for good reason; ‘Overdam’ foliage has cream-white stripes; ‘Strica’ earliest to bloom, very upright; very well behaved grass.
Reed Grass, Korean (Calamagrostis brachytricha) native to woodland edge in Asia; glossy green foliage and red tinted feathery flower heads in September create strong vertical plant; the showy flowers fade to silvery green through fall;  prefers consistent moisture but is easy to grow in most soils; excellent in containers; 3-4’ high.            

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