Photo Credit: Bruce Newhouse.
Photo Credit: Bruce Newhouse
Also known as: Slender false brome, wood false brome
False brome is spreading throughout the Willamette Valley at an alarming rate. Originally introduced to the region as an experimental forage plant in the late 1930s, it has become a significant nuisance species throughout the mid-Willamette Valley.
|Life Cycle:||Perennial (life cycle lasts more than one year)|
|Early Detection and Rapid Response species:||Yes|
|Height:||Up to 3 feet tall (1 meter)|
|Leaf Description:||The leaf blade is flat and floppy and distinctively bright green. When held up to the sky, a fringe of fine hairs can be seen along the edges of each leaf. Leaves may remain bright green throughout the winter when other grasses are dormant.|
|Fruit & Flower Description:||Miniature, white flowers and seeds are spiked and droopy. They are directly attached to the to the plant stem with no stalks. Only plants in their second year or older produce seeds.|
|Bloom Time:||June to September|
- Can grow in a variety of habitats including shady forests, riparian areasAreas that are directly adjacent to flowing streams, creeks, or rivers., prairies, and roadsides.
- It is a hardy grass species and can tolerate a wide variety of conditions from dry to wet, and sun to shade.
- Without natural constraints, false brome is rapidly expanding in Oregon.
- Forms thick mats that prevent native plants from establishing. This degrades wildlife habitat and prevents tree regrowth, especially in oak woodland habitats.
- This grass may be fire-resistant, re-sprouting within two weeks of a burn.
- Toxic to some livestock such as sheep and goats.
What we’re doing about it:
- False Brome is categorized as a Priority species for the Tualatin SWCD. As such, our Invasive Species Program has been actively monitoring and treating it throughout the watershed.
- If identified within Washington County, a specially trained crew can come out survey for the species. If found, the crew will treat the infestation at no cost to you.
What you can do about it:
- Please report any false brome infestations to the Oregon Invasives Species Hotline.
- False brome’s seeds can easily become attached to footwear or hiking gear. It is extremely important to clean clothing and use a boot brush to prevent spreading seeds to new locations.
- Small patches can be hand pulled, with the best results in April to early May. Be careful to remove the roots and throw all plant parts away in a tied plastic bag in the trash.
False brome is similar in appearance to a native brome, Columbia brome (Bromus vulgaris). Columbia brome is an important species in riparian areas as its fibrous roots hold streambank soil and decrease erosion. It is very difficult to classify false brome and Columbia brome, it’s best to consult a weed identification professional when trying to distinguish these species. The best way to tell these species apart is examining their leaves – Columbia brome does not have tiny hairs along the edge of its leaves.
Noxious Weed Listing:
Download False Brome Best Management Practices factsheet