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Ornamental Grasses
Grasses have always been the predominate part of our
native prairies. We are most familiar with the use of
them in the landscape as ground covers, or what we would
normally refer to as lawns. However, when used in the
landscape certain varieties of grasses can add a great
deal to the texture, color, motion and even sound of the
garden. They can be used as individual specimens, in
mass plantings or as border plants. Many of them are
also a good source of dried materials for arrangements.
Due to our northerly location we are somewhat limited as
to the varieties that are perennial. Even though Pampas
Grass (Cordateria selloana), which has been the
ornamental grass that is most familiar to all of us, is
not hardy in Montana or most of the plains, there are
still a number of highly ornamental grasses that can add
beauty to the landscape and garden.
The following are some of the more ornamental grasses
that are available for planting. The perennial cultivars
will benefit from winter protection provided by a good
snow cover or mulch to increase their hardiness. Grasses
are all relatively insect and disease-free and require a
minimum of maintenance. Trimming, or cutting back, the
old, dried foliage in spring is about all that is
required. |
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Briza media
(QUAKING GRASS)
Medium growing upright perennial that prefers sun and
blooms in May. It has a height of 2-3' and spread of
2-3'. The flower heads resemble snake rattles. Needs to
be watered and mulched in the winter. May need to
planted every year.
Calamagrostis acutiflora ‘Karl Foerster’
(FEATHER REED GRASS)
2001 Plant of the Year. This very popular grass begins
to flower in June and the show doesn’t stop until you
cut it back in the late Fall or early Spring. The erect
6 foot plumes splay gracefully after a rainstorm or
dusting of snow, and then return upright again when they
dry. This grass grows 3 to 7 feet in sun or part shade.
One of the best all around grasses. It is trouble free,
not fussy about soil, withstands drought and provides a
long season of interest. Zone 4.
Carex Cultivars
Grasslike, clumping plants grown for foliage effect
in borders, rock gardens, containers, and water gardens.
Long, narrow leaves are often striped or oddly colored.
Many interesting cultivars are available. Most are
annuals in our climate.
Deschampsia caespitosa
(TUFTED HAIR GRASS)
Deep green tufted grass that grows to two feet. A cool
season, evergreen grass that is hardy in Zone 4. Also
worth trying in Zone 3. Normally found in moist, boggy
sites and will do best in a moist site in partial shade.
Produces delicate flowers in June that rise two feet
above the plant and remain showy into winter. Because of
the fine texture of the flowers it is best used in mass
to enhance the effect of the flowers.
Elymus glaucus
(BLUE LYME GRASS)
This 2-3' tall grass is a vigorously spreading perennial
with distinctive metallic blue foliage. Makes a quick
ground cover for rough areas. Plant in full sun for
brilliant foliage color. In the landscape, this grass is
a beautiful contrast to purple foliage. Cut back faded
foliage in Winter or Spring to tidy plants.
Elymus magellanicus
(MAGELLAN WHEATGRASS)
This grass, with its steel-blue clump of leaves is just
the answer if your landscape is experiencing a blue
shortage. The leaves are the attraction, the flowers are
not significant.
Erianthus ravennae
(RAVENNA GRASS or HARDY PAMPAS GRASS)
This imposing vertical grass sports shiny silver plumes
with a stout central rachis held 4 to 5 feet above the
basal clump of 1 inch wide leaves which are 4 feet high.
Makes a good screen or accent plant. Zone 5-6.
Festuca Cultivars
(BLUE FESCUE)
Small six inch tall grass with attractive,
fine-textured, blue foliage. Cool season grass that is
hardy in Zone 4. It flowers profusely on erect stems to
15 inches, which fade to a pleasing light tan. In hot
spells the foliage may brown out but revives with the
onset of cooler weather.
Helictotrichon sempervirens
(BLUE OAT GRASS)
Medium growing mounding perennial with oat like flowers.
It likes sun and blooms beginning in summer. Height 2-3'
with a spread of 2-3'. Best used as accent or in rock
garden, very attractive and adaptable. They combine well
with other grasses and broadleafed plants, and with
boulders in rock gardens. Groom by pulling out
occasional withered leaves. Hardy in all zones.
Luzula sylvatica
(GREATER WOOD RUSH)
Compact mounding perennial with chestnut brown flowers.
Likes partial shade or shade, blooms in April with a
height of 1' and spread of 1-2'. Prefers good moist
soil. Finest of the wood rushes for ground cover.
Miscanthus giganteus
(GIANT CHINESE SILVER GRASS)
This upright broadleaf grass grows to a height of 8 to
12 feet with a spread of up to 5 feet. Grow in sun.
Forms a graceful screen. Flowers with towering tassels
that mature from reddish-tan to silver.
Miscanthus sinensis Cultivars
(MAIDEN OR EULALIA GRASS)
Warm season grasses that are hardy into Zone 4. Most
grow to about 4 feet , and many have striking
variegation, banding or striping. Upright grower. All
bear showy flower plumes in silver or rosy hues in the
late Summer or Fall. In Fall the three-quarter inch wide
leaves color to a bright red-orange before fading to a
silken white in Winter. Forms a large clump in time, a
ten-year old specimen can be 30 inches or more across.
Needs full sun.
Molinia caerulea
(PURPLE MOOR GRASS)
Rapid growing upright perennial with brownish purple
spike flowers. Likes sun and blooms in June. Height 1-2'
with a spread of 1-2'. Prefers good moist soil. The
flowers stand 3' above foliage. Water and mulch in
winter. A variegated cultivar is also available.
Molinia caerulea arundinacea ‘Windspiel’
(MOOR GRASS)
Large grass that forms green clumps of four to five feet
in width and two to four feet in height. Delicate, wire
fine yellow seed heads are borne on stems of up to seven
feet in July and August. Hardy in Zone 4. Best planted
where it will have space to develop and against a plain
background so the fine seed heads can be appreciated.
Will tolerate light shade but prefers full sun.
Panicum virgatum Cultivars
(SWITCH GRASS)
Shorter and more upright form of the native species.
Most reach up to five feet when in bloom. Slight blue
cast to foliage. Hardy in Zone 4. A sod forming grass,
Switch Grass quickly develops into a bushy plant in the
garden. The fine-textured, airy flower heads are
produced in late summer and turn a warm, glowing wheat
color in winter. Should be cut back in early spring.
Prefers full sun.
Pennisetum alopecuroides
(PURPLE FOUNTAIN GRASS)
Rapid growing upright with dark green, narrow leaves
forming clumps with flowers arching above. Flowers are
round, like bottle brushes, and very showy. Likes sun
and blooms beginning in late Summer. Height of 3'-4'.
Use in dry locations, as in gravel beds, or as a focal
point in low ground covers. Drought resistant.
Phalaris arundinacea picta
(RIBBON GRASS)
Strongly rhizomatous grass that forms a spreading clump
of 18 to 24 inches in height. Very attractive highly
variegated green and white leaves. Will do well in most
any soil and withstand drought particularly well.
Prefers sun. Hardy in Zone 3. Spreads aggressively. |
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The above cultivars represent only a few of the many
ornamental grasses that are available to plant in our
area. |
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Ranunculus
Radiant |
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Peony
Bashful |
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Iris
My compliments |
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