Brush clearing in Washington and Oregon

The four Northwest brush problems

The Washington State Noxious Weed Control Board lists weeds in classes A, B and C; in the board’s own wording for holly, a Class C listing means control is not required unless a county selects it. Oregon’s list, kept by the Oregon Department of Agriculture for the State Weed Board, assigns weeds to an A list or a B list, and some also carry a T designation.

The practical reading: a Class C or List B listing does not oblige you to clear anything on a residential lot in most counties, but it tells you what you are up against, and some counties do select blackberry or broom for required control along property lines. Check with the county weed board before assuming.

Three of the four have their own removal guides: how to get rid of Himalayan blackberry, Scotch broom and English ivy on trees.

Methods: mowing, mulching, hand crews, goats

• Brush mowing. A flail or rotary brush mower on a skid steer or tractor knocks blackberry and broom to the ground fast. It is the first pass, not the cure: the weed board’s blackberry guidance is to cut the stems leaving about a foot, then dig out the main root ball and as much of the spreading side roots as possible, and monitor for resprouts.
• Forestry mulcher. A drum head on an excavator or skid steer grinds brush and small trees into chips in place, which is the right tool for an acre of blackberry with holly and young alder mixed in. It does not remove roots, and it leaves a chip layer that broom seedlings come through, so it is still a two-year job.
• Hand crews. Required where machines cannot go: slopes, under trees you want to keep, along streams, and for ivy. The weed board’s ivy method is to cut the vines at waist to chest height all the way around the trunk and pull the lower stems away from the base, which kills everything above the cut; roots left in the soil resprout, so the ground ivy is pulled and the area re-walked. For broom, hand pull small plants; the board says cutting larger plants close to the ground when they are drought-stressed can control plants with stems wider than 2 in.
• Goats. The weed board notes success from grazing, especially by goats, on blackberry, with a limit: grazing controls spread but does not eradicate the plants. Goats are a maintenance tool on a lot you cannot mow, not a one-time clearing.
• Holly. Cutting alone fails; the stump sprouts. The board’s assessment is that mature holly is extremely difficult, with herbicide over an extended period showing promise and injection the most effective long-term method. Removing the stump with the roots is the non-chemical route, which is excavator work (stump removal vs grinding).

Clearing around trees you want to keep

Most brush in a Northwest yard grows under something worth saving, and the machine that clears it can do more harm to that tree than the blackberry did. ISA’s construction brochure lists the ways equipment injures trees: soil compaction that slows root growth and cuts off water and oxygen, bark torn from the trunk and root collar, and soil or debris piled over the base of the trunk, which the root collar is especially vulnerable to [15]. A Mississippi State University Extension publication makes the same point about mowers and string trimmers as a general principle: the structural roots take the most stress just above the soil line, which is exactly where a mower or trimmer hits them, and mulch is the way to keep equipment off [16].

Three rules follow for the crew. Keep tracked machines and mulcher heads outside the dripline of trees you are keeping, and have a hand crew work the last ring. Pull the mulch layer back from trunks: ISA’s mature-tree guidance is mulch 2 to 4 inches deep, near but not touching the trunk, out to the dripline [17], and a forestry mulcher can leave far more than that. And treat blackberry root-ball digging as digging: ISA’s utility brochure says to have underground lines located before any digging and never to assume they are deeper than you plan to dig, and gas operators often keep 10 feet on each side of a pipeline free of trees [18]. The state call-before-you-dig rules are summarized on tree root damage on your property.

Timing

The calendar comes from the plants’ biology. Scotch broom: the weed board says to control plants before the seed pods mature, which means spring to early summer, and to keep monitoring for seedlings for years because the seed bank lasts decades; cutting mature broom at ground level works when the plants are drought-stressed in late summer. Blackberry: cut any time, dig roots when the soil is soft in fall or spring, and expect to treat resprouts; burning the canes is allowed only where burning is allowed at all (see below), and the board is clear that fire will not kill the roots. Ivy: any season, with the trunk cuts done first so the trees are relieved before winter storms add the vine’s weight to the canopy. Holly: cut-and-treat in the growing season if herbicide is used; stump removal any time the ground allows a machine.

Two Northwest constraints sit on top of that. Mechanical clearing on ODF-protected land during Oregon’s declared fire season carries regulated-use restrictions and industrial fire precaution levels (ORS 477.505–477.512), and Washington’s DNR posts statewide burn restrictions and bans in summer. And nesting season: a mulcher through a blackberry thicket in May is a mulcher through nests; a crew that works brush in the Northwest will tell you it prefers late summer and fall.

What to do with the debris

Blackberry canes and broom make a large, light pile. Chipping is the default: a mulcher leaves the chips in place, a hand crew feeds a chipper, and ivy, which re-roots from fragments, is bagged or hauled rather than spread. Washington’s plant quarantine covers broom and ivy, but hauling them for disposal under a weed agency’s guidelines is exempt (WAC 16-752-630). Burning is restricted almost everywhere people live. In Washington, residential and land-clearing burning is prohibited in every urban growth area and every city over 10,000 (WAC 173-425-040; RCW 70A.15.5020), and DNR does not permit burning of land-clearing debris on the lands it protects. In Oregon, backyard burning is banned year-round inside the Portland-metro boundaries in OAR 340-264-0120 to -0140, and in Lane County LRAPA bars yard-debris burning inside Eugene city limits with 2-acre minimum lots in the Eugene UGB. Where burning is allowed, Southwest Clean Air Agency’s self-issued permit covers a single pile under 10 by 10 by 6 ft of dry natural vegetation outside its no-burn areas, and larger slash or land-clearing piles need a site-specific permit. The county-by-county rules are in Oregon yard debris burning rules and Washington yard debris burning rules.

Brush and defensible space

The same four plants are the fuel that carries fire to a house in the wildland-urban interface, and clearing them is the first job in creating a defensible space. Dead broom and dry blackberry canes against a fence are ladder fuel into the trees above; ivy up a Douglas fir carries flame into the crown. Oregon’s fire season is declared by the State Forester under ORS 477.505, and Washington’s DNR burn restrictions and the Commissioner’s burn bans are posted on its burn-restrictions page and Burn Portal, so the clearing is done before the season, and the debris is chipped or hauled rather than stacked to burn in October.

NOAA’s Storm Events records put numbers on “before the season”: of the 518 Washington and Oregon wildfire reports logged from 2016 to 2026, about 77 percent began in July, August or September [19]. Brush cut in spring or after the first fall rains is brush that is not standing dry in August.

Permits and sensitive areas

Pulling blackberry in a backyard needs no permit. Clearing with a machine can, once the area or the location crosses a city’s threshold: Marysville requires a clearing and grading permit for clearing over 1,000 sq ft, including tree felling, or any work in a critical area or buffer; Port Angeles for 7,000 sq ft of disturbance or work in environmentally sensitive areas; Mount Vernon’s land-clearing permit applies above 2 acres, with exceptions for routine maintenance on developed lots (MVMC 15.18); Lacey requires a land-clearing permit or exemption before removing trees 4 in DBH and up. Stream buffers, wetlands and steep slopes are regulated in nearly every city, and a mulcher in a stream corridor is the fastest way to a stop-work order. Trees mixed into the brush follow the tree rules: in Seattle the regulated size starts at 6 in DSH, in Portland at 12 in. City by city: Oregon, Washington. The three permit systems that apply to larger jobs are on the land clearing hub.

What brush clearing costs

We do not publish a per-acre price, because an acre of 4-ft blackberry on flat ground and an acre of holly and broom on a slope are different jobs by a factor of several. Brush clearing is priced by the hour: a hand crew at the crew-hour rate, or a machine at a machine-hour rate plus mobilization. Our model has a crew-hour rate and no machine rate. Modeled estimate, not quotes (method).

Modeled estimate, not quotes (method). The labor index behind the rate is the BLS May 2025 mean hourly wage for tree trimmers and pruners: $35.40 in Oregon and $32.20 in Washington. A fair quote states the hours or machine-hours assumed, what happens to the debris, and whether a follow-up visit for resprouts is included; the follow-up is the part that makes the first visit worth paying for. Tree work priced alongside brush follows the tree removal cost page.

Related guides

• Himalayan blackberry: how to get rid of it for good
• Scotch broom: how to identify it and get rid of it
• English ivy on trees: how to remove it without hurting the tree