Also known as Blue Oatgrass, this plant is very striking with its slender, inward rolled, blue-gray blades in an open tuft, casting arching sprays of ornamental, light buff-colored, 4 ft seed spikes that shoot up and ripen to a soft brown by midsummer. Blue oat grass in 5b is a beautiful grass, but be warned it is HIGHLY invasive in good growing conditions.Would recommend planting in a large pot to control it's growth. This is an eye-catching ornamental grass that remains vibrant all summer long. Particularly beautiful planted in masses and paired with blue-gray Mediterranean plants. When Blue Oat Grass … Wet, clay soils may lead to root rot. Depending on when they are planted, they can produce green manure (from spring planting) or winter cover (from fall planting). This grass does not tolerate hot, humid summers and flowering may be reduced under those conditions. Best in full sun and a moist, well-drained soil. BLUE FESCUE Festuca ovina glauca ‘Boulder Blue’, ‘Beyond Blue’ 10 inches high, 10 inches wide Bright blue foliage, tufted form. Blue Oat Grass (Helictotrichon sempervirens) grows in neat, densely rounded clumps of metallic, silvery blue foliage.This reliable, attractive grass is often used in garden design and landscaping. By regularly cutting your oat grass … Oat grass is used as a dietary supplement for people, and it can often be used as a "cat grass" to discourage your house cats from eating your other prized plants. Keep the soil moist and in ten days or so offer it to your cat. Self seeds. It is non-spreading and will grow 2 - 3' tall and just as wide. Oat-like flowers. Sow Right Seeds - Cat Grass Seed for Planting - Easy to Grow Oat Grass That Your Cat Will Love - Non-GMO - Full Instructions - Great Gardening Gift (1 Packet) 4.3 out of 5 stars 66 $5.99 $ 5 . Plant beside landscape boulders, in rock gardens or at the edges of natural pools. Blue Oat Grass, Helictotrichon sempervirens, supplies the landscape with spiky tufts of unmistakable blue ornamental grass. Blue oat grass grows as an upright tuft or mound, reaching a height 2 to 3 feet when in flower. 99 Its petite size and vibrant color makes it an excellent little accent plant in rock gardens and small beds. Adds texture and color for the entire growing season, can be planted in mass to naturalize or alone as an accent. “Drop the seeds in soil and add water. Oat grass is the grass that produces oats when its allowed to go to seed. BLUE OAT GRASS Helictotrichon sempervirens 24 inches high, 36 inches wide Intense blue, spikey foliage with rounded form. Blue oat grass in containers. This quick-growing workhorse can also be used to feed livestock, prevent erosion, and produce grain for flour and oatmeal. 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