Growing to heights of up to 12 inches, blue fescue is a showy grass that’s different, however, from the tall fescues typically used in turf lawn mixtures. It’s best to plant blue fescue seed in the early spring or late summer. There are few pest and disease problems with blue fescue. You will need to divide the plant every two to three years, as the plant will die in the center within a few years if it is not lifted and divided. Division helps keep the plant healthy, while providing more plants for your garden.
Light
Blue fescue thrives in full sunlight; it tolerates part-shade but will not flower as well in it, and the foliage tends toward green instead of slate-blue. The more sun this ornamental grass receives, the more likely it is to achieve its famous blue-gray hue.
Soil
This plant prefers relatively consistently moist soil that is well-draining. It does not tolerate wet, soggy conditions. However, mature plants can withstand drought conditions.
Water
This plant has average moisture needs. Water weekly during hot summer months to keep it green and growing; short periods of drought will stunt, but not kill the plant.
Temperature and Humidity
Blue fescue is a cool-season plant and prefers the cool temperatures of spring and fall. It grows fine in summers with moderately warm conditions, but blistering heat and high humidity will cause the foliage to die back and may shorten the lifespan of this perennial.
Fertilizer
Compost applied around the plant as mulch provides all the feeding that blue fescue requires.
Types of Blue Fescue
‘Elijah Blue’ has light blue foliage and is the most popular cultivar.‘Golden Toupee’ features chartreuse leaves.‘Boulder Blue’ boasts a silver-blue hue and tolerates higher heat and humidity.‘Blaufink’ offers compact features and a fine texture.‘Tom Thumb’ grows to be only about 4 inches tall.‘Harz’ displays an olive-green color, with a hint of purple at times.
Pruning
Cut back the foliage in early spring to within a few inches of the ground. This will help make room for the new grass blades and will improve the look of the plant. To keep the foliage looking good, remove dead blades of grass. The flowers add movement to the garden, and the seed heads provide winter interest. Leaving the seed heads may cause the plant to self-seed; this can be fine if it’s located where you want it to spread but will require culling if you want to keep it confined.
Propagating Blue Fescue
One of the best ways to propagate blue fescue is through division. (Blue fescue rarely lives past three to five years unless it is divided, so this is a must-do.) Here’s how:
How to Grow Blue Fescue From Seed
It’s easy to grow blue fescue from seed. Start seeds indoors in late winter, in peat pots filled with seed-starting mix. Three seeds per pot are all you need, lightly covering with the selected soil and keeping them moist till they’re ready to go outside. Make sure to harden off seedlings before planting in the garden. Blue fescue seeds can also be sown outdoors, directly into the soil, either once the chance of frost has passed or in late summer.
Overwintering
Fescue is a cool-season grass that is hardy to USDA zone 4. No special steps are required for overwintering. In cold climates, the grass turns brown in the winter, which is part of the natural dormancy process.
Common Pests
Aphids can be a problem with blue fescue. A blast of water can wash them away, but tougher infestations can be remedied with horticultural oil or insecticidal soaps.
Common Problems With Blue Fescue
Gardeners in warm climates may experience a different problem with blue fescue: above-ground growth may die back during the summer, due to excessive heat and humidity. When this happens, give the plant a “haircut,” since its appearance is temporarily spoiled anyway. In many cases, the plant will recover when more moderate weather returns.
