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Cass County Extension |
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Ornamental Grasses |
Big Bluestem (Andropogon gerardii) is a
native grass; foliage 10-15" high. Flower heads reach 5-6'; September. Seed head resembles a turkey foot. Upright clump former;
spreads by rhizomes. Gray-green foliage; light red fall color. Prefers sun and well
drained soil. Divide in spring. `Pawnee (4-5');
`Bonilla (SD seed source); `Bison (ND seed source).
Large Blue Fescue (Festuca amethystina) is a fine textured, 12-18 inch grass that forms a tufted mound. Good blue color with amethyst colored flowering stems. Stem color best in June; cut flowering stems back in fall and foliage in the spring. Best in full sun and moderate to well drained soil; divide in spring. Tend to be short lived here. 'Bronzeglanz' (Bronzeluster) (green to blue gray foliage). 'Klose' (light blue foliage). `Superba (blue-green foliage; shorter).
Blue Fescue (Festuca cinerea) is very similar to F. ovina `Glauca. The 6-10" clumps of
blue foliage fade to a greenish blue color; very finely textured. Flowers detract from the
foliage; remove. Clump former; will not fill in open areas. Clumps tend to die out in the
center and need to be divided every 3 years; spring. Well drained soil is a necessity.
Tend to be short lived here; mow down in spring for cleanup. `Elijah
Blue (best of the blue fescues; short glaucous powdery blue foliage. No
flowers). 'Sea Urchin' (more rigid and compact; sea green color). 'Solling' (short
glaucous bluish grey-green foliage; no flowers).
Hardy or Rose Fountain Grass (Pennisetum alopecuroides) is a 2 to 3 foot tall grass with narrow arching bright green leaves that grow in a dense mound. Pinkish fox tail-like flower heads arch out above the foliage like a fountain; mature to rose copper seed heads; late summer. Golden yellow fall color. Best in full sun and well drained fertile soil. Needs winter protection. Divide every 5-10 years; spring. Space 24" apart; tend to be weedy. Marginally hardy. `Hameln' (shorter, more compact; flower heads are slightly smaller and are greenish-white. Self seeds; revert back to species).
Pink Fountain Grass (Pennisetum setaceum)
(P. ruppelenianum) must be treated as an annual; has an arching growth habit. Spires
of red to dusty pink flowers and seed heads; dont
dry well. Taller and more weak stemmed than hardy fountain grass; may require
staking. Plant in groups; space about 1' apart. Takes heat and drought well. The dark
green foliage dries to a clear, clean straw color; clumps look like tiny shocks of corn.
May reseed. Start seed in mid March and transplant out in mid May; space 18-20".
`purpurescens (purplish foliage and pink heads; must be grown from divisions).
White Fountain Grass (Pennisetum villosum)
is very similar to rose fountain grass; 2' in height. Grow as an annual; tends to be
weedy. Not worth growing.
Indian Grass (Sorgastrum nutans) is very
common native grass; upright and clump forming. Variable in height, flowering time
and lodging. Tan to orange fall color; good through the winter. Flower stems 4 to 6
feet tall; yellow-brown flowers in late summer and bronze-red seed heads. Very drought
tolerant; likes good sun. Propagate by seed or division; spring. `Sioux Blue' (powder blue
leaves; never needs staking. Self-sows manageably but seedlings may revert to species);
`Holt (Nebr seed source); `Tomahawk (ND &
SD seed source).
Little Blue Stem (Schizachyrium scoparium or
Andropogon scoparius) is a compact native grass; name is derived from the blue color
at the base of the clump. Varies from bluish foliage in spring, to green in summer and
various shades of red, orange, and pink in the fall; foliage is 12-18" in height with
flower stems reaching 3-4'. Fuzzy white seed heads at maturity. Varies in form, height and
lodging. Prefers sun and fairly infertile soils; very drought tolerant. Propagate by seed
or divisions in spring. `Badlands (ND seed source); `Blaze
(Nebraska seed source); `Camper (Nebraska seed source).
Blue Lyme Grass (Leymus or Elymus arenarius
or glaucus) grows 24-30" in height; space 18-24" apart. Course blue foliage (3/4" wide leaves); one of the bluest grasses.
Good in flower arrangements. Irregular growth habit and invasive rhizomes; consider
planting in enclosed area. Usually doesnt form heads; tall grey-green to yellow
flower clusters in late summer that resemble wheat heads. Can be used along lake or sea
shores. Prefers sun and well drained soil; likes hot, dry sites. Divide in early spring.
Giant Miscanthus (Miscanthus floridulus or
M.`Giganteus) has huge, bamboo-like, long course leaves;
rarely flowers. Slightly spreading upright clump; grows 7-8' in height and 3-4' wide.
Usually loses lower leaves by late summer; tan fall color. Best in full sun under a wide
range of soil and moisture conditions. Divide in early spring. Hardiness is questionable.
Japanese Silver Grass (Miscanthus sinensis) has coarse green foliage and is generally not grown.
Chinese
(Amur) Silver Grass (Pampasgrass,
Silver Bannergrass) (Miscanthus sacchariflorus or M. s. amurensis) grows
4-5' in
height. Long invasive rhizomes; spreads like quackgrass. Early flowering with narrow
wisk-like plumes; very silver in appearance.
Doesnt set seed here. Tan to orange fall color. Useful for edges of ponds and
streams. Prefers sun; does well in drought or soggy soil.
Red Flame Miscanthus or Flame Grass (M. sinensis `Purpurascens or M. purpurascens) is 3-4' tall with wide dark green leaf blades. Narrowly upright; never needs staking. One of the best Miscanthus. With good moisture, leaves will have a reddish cast by mid-summer; fall color is tan to orange. Flowers are a silvery white; late summer. Sun to light shade; better leaf color in higher light.
Other cultivars of Japanese Silver Grass: `Malepartus (flowers are 2' above foliage; purplish-pink flowers becoming fluffy and white upon drying. Early flowering; bronze- orange fall color; doesnt need staking), `Silver Feather (`Silberfedher) is a 5-6' tall, silky grass similar in appearance to Pampas grass. Medium green foliage and silvery-white plumes in September; rising 2' above leaves. May need staking even in full sun; tan fall color). `Strictus (Porcupine Grass) is 5-6' high, very attractive and has yellow streaks across the leaves. Borderline in hardiness; winter protection needed); `Variegatus (bold textured creamy white striped foliage; 4-5' tall and wide. Flowers in September. Weak stemmed; usually requires staking. Marginally hardy. `Zebrinus (Zebra Grass) (4-5' tall and very attractive; yellow streaks across the leaves. Borderline in hardiness; winter protection needed).
Small Japanese Silver Grass (Miscanthus oligostachyus) has short, wide bamboo-like leaves; 3-4' tall. Late July flowering; silver flowers. Forms a dense upright clump; soft tan fall color.
Purple Moor
Grass (Molinia caerulea) has a medium to fine texture; grows in tall narrow
tufts. 1.5 to 2 feet tall; airy yellow flower stalks in late summer;
yellowish fall color. Space 15-24" apart. Slow growing; prefers full sun and moist,
well drained, acidic soil. Seems to do well here. Moist, humid growing conditions promote
disease. `Heather Bride (more compact), 'Variegata' (longitudinally striped with creamy white;
shorter than species. Best in light shade but will tolerate full sun with good moisture.
Very marginal hardiness.)
Tall Purple
Moor Grass (Molinia caerulea var. arundinacea) forms clumps with fine-textured,
2-3' foliage topped by 4-5', open, airy flowering stems in late summer. Yellow fall color;
two or three years to flower. In late fall, stalks will shatter and break off at the
ground. Slow growing. Best in full sun and moist, well drained, acidic soil; seems to do
well here. Easily propagated by seed; named varieties must be propagated by division. 'Sky
Racer' (robust upright clumps; 6-7' flower stems. Golden yellow fall color), 'Windspiel' (pencil-thin,
5-6' flower stalks; yellow fall
color).
Blue Oat Grass (Helictotrichon sempervirens
or Avena sempervirens) has semi-evergreen, blue-gray foliage; fine to medium
texture. The narrow, arching leaves grow 18 to 24 inches tall; floral heads reach up to
three feet. Flowers are initially pale blue turning beige; summer. Sparse in
northern areas. Space 12-15 inches
apart. Non-invasive. Best in well drained neutral to alkaline soil; tolerates drought once
established. Prefers sun but will tolerate partial shade; best with low humidity. More
vigorous, longer lived and hardier than the fescues. Propagate by seed or division;
spring.
Variegated
Bulbous Oat Grass (Arrhenatherum bulbosum `Variegatum) has broad
cascading leaf-blades 8-12" long with white margins; tuberous roots. Flowering is
usually weak or absent. Space about 15" apart. If leaf tips brown, shear to the
ground to promote new growth. Prefers sun to partial shade. Does well in any fertile soil;
doesnt like heavy soil. Tolerates poor and dry soils once established; slow growing.
Grows best in cool spring and fall temperatures.
Fall Blooming Reed Grass or Korean Reed Grass (Calamogrotis brachytricha or C. arundinacea var. brachytricha) is an upright arching clump forming grass. Flower stalks reach 3-4' in height; foliage grows to about 18-24". Pink and purple flowers in September. Plant turns buff color after frost; heads persist into winter. Cut back in spring; emerges early. Space 18-24 inches apart. Good in sun or partial shade; may need water during dry periods. Propagate by seed or division; spring.
Feather Reed
Grass (Calamogrotis x acutiflora) `Karl Foerster resembles wheat with its
fluffy flower plumes; purplish-pink in late June, beige by August and last through winter.
Dense, narrow, upright, clump former; dull green, coarse textured foliage to 2½-3
and flower stalks 4 feet tall; very nice. Plant in sun or light shade. Propagate by
division in spring; sterile hybrid. `Overdam (green
and white variegated foliage; slightly smaller and less vigorous than `Karl
Foerster). `Stricta (slightly taller than Karl Foerster; tends not
to flower here)
Ribbon Grass, Gardener's Garters (Phalaris
arundinacea) is 18-24 inches in height; space 1-2' apart. Flowers are insignificant.
In hot dry summers, leaf tips may brown; cut back for regrowth. Late season growth may
revert partly back to green. Best in full sun to partial shade; less vigorous in shade.
Leaf color fades in full hot sun. Performs well in moist soils. In fertile soil will
become taller, lose variegation and become more aggressive. Invasive; spreads rapidly.
Easily propagated by division; may be necessary on a regular basis. Divide in the spring.
var. luteo-picta has yellow and pink stripes on the new foliage; green by
midsummer. Cut back to encourage new growth; invasive. 'Feesey's
Form (Strawberry & Cream) has better and longer lasting variegation. Nearly
white foliage; often pink or reddish early in the season. Less aggressive than common
form. `Picta has variegated green and white arching foliage; weakly upright growing.
Sideoats Grama (Bouteloua curtipendula)
is a clump former; basal foliage growing to 12-15". Flowers (late summer) and purple oat-like spikelets form to one side of the stem; bleach to a beige
color with age. May reach 2-3' in height. Foliage often turns shades of purple and
copper-red in the fall. Prefers dry soil and full sun; good drought tolerance. Slowly
invasive. Divide in spring. `Butte (taller; Nebr seed source); `Pierre (SD
seed source); `Trailways (12-18' tall ; fine leafed).
Siberian (Silver) Spike Grass, Frost Grass or
Graybeard Grass (Spodiopogon sibiricus) has one inch wide, green leaves,
strongly angled upward when young, become horizontal in mid-season, offering a bamboo-like
effect; stems 3' in height. White stripe down center of leaf. Very nice; one of the best
grasses. Purple flower spikes grow about 14-18" above the foliage; late August. Seed
heads persist until late fall. Fall color varies from red to wine-red or purple-bronze.
Full sun for good fall color and sturdy, upright specimens. Does well in light shade;
resents hot, dry sites. Divide or seed; spring.
Switch Grass, Reed Switch Grass (Panicum
virgatum) is a warm-season native grass. Use in mass where its fine-textured flowers
and seed heads will produce a cloud like effect. Dense,
upright growth habit; 3-7' when in flower. Green to blue-green foliage; takes on a beige color for winter. The light, airy
flower panicles vary in color from green to pink. Forms with a reddish fall leaf color
show more pink color in their flowers. Bloom in late July or early August. Foliage and
flowers are effective in both fresh and dried arrangements. Best grown in full sun and
fertile soil. Good in wet or dry soils; the more moisture, the taller it will grow.
Tolerates some shade; too much shade reduce the intense fall color. Floppy habit if grown
in medium to heavy shade. Propagated by seed; named cultivars must be increased by
division; early spring.
Cultivars: `Dakotah (ND seed source); `Forestburg (SD seed source); 'Hanse Herms' (loose, upright foliage; 4-5'. Green with a red tinge in summer and red-burgundy in fall; red flowers); 'Heavy Metal' (stiffly upright; metallic blue leaves and yellow fall color. 4-5' tall; stands up well. Drought tolerant and non aggressive); 'Prairie Sky' (better foliage color, hardier, and has more vigor than `Heavy Metal); 'Rehbraun' (red-tinged foliage and red flowers; fall color not as good as 'Haense Herms'). 'Rotstrahlbusch' (good red fall color; may be synonymous with 'Haense Herms'. Blue cast to the foliage; 5' in bloom); 'Squaw' (more compact; good red fall color); 'Strictum' (more upright. Light blue-green foliage; red-purple tints in fall. 'Warrior' (reddish brown fall color).
This page was last updated February 2003
| Todd Weinmann, Extension Horticulturist & Master Gardener Coordinator |
| Phone: (701) 241-5707 |
| E-mail: tweinman@ndsuext.nodak.edu |