What is Slender False Brome?
Slender false brome is a state-listed B invasive species, native to North Africa and Eurasia. It is a perennial bunchgrass most commonly found in dry woodlands, but may also grow in open areas. The tall, tufted grass may grow up to 3 feet high and displays a nodding growth habit in both its blades and flowers. The blades are broad and flat with fine hairs on the edges and both sides of the blades, and may range from dark green to bright yellow-green in color. Stem sheaths are densely hairy, and inflorescences (seed heads) bear relatively large seeds, which are directly attached to the stem. Because this species may be difficult to distinguish from other grasses, we recommend emailing our noxious weeds program staff for positive identification.
Why is Slender False Brome a Problem?
Being highly shade and drought-tolerant, slender false brome can quickly outcompete native plants and establish itself as the dominant species in forest understories. It acts as excellent cover for rodents, often leading to increased populations, which in combination with the suffocating nature of established false brome thickets can severely restrict the recruitment of young native trees and shrubs, as any seedlings which manage to establish themselves in the dense grass will often be eaten by the increased rodent population. Slender false brome may also be toxic to livestock, especially sheep.
Controlling Slender False Brome
Small patches of slender false brome can effectively be controlled by hand-pulling before patches become established. This is best done in April and May, when the grass has not yet gone to seed and early spring rains moisten the soil, allowing for the weak root system to easily be dislodged. Hand-pulled patches should be monitored in the following years for signs of resprouting.
Larger patches, however, are most effectively treated through chemical means. Early summer through mid-fall is the best time for herbicide treatment, and mowing false brome patches each year in June before seeds are produced can reduce the overall amount of herbicide needed by preventing the grass from re-germinating after treatment. For advice or assistance in controlling slender false brome infestations, or to report an infestation, please contact the Lincoln Soil and Water Conservation District by calling (541) 265-2631 or by emailing Lincoln Soil and Water.
An in-depth summary of slender false brome control methods can be found in this document: