Phragmites Removal in New Jersey

Identification

Non-native phragmites is easy to identify by its sheer size and density. It’s the tall reed forming monotonous walls of identical stems along roads, ditches, and wet areas.

Height: 8–15 feet. The tallest common plant in NJ wetlands.

Stems: Stiff, bamboo-like, hollow. Previous year’s dead stalks remain standing through winter — the familiar brown walls along NJ highways.

Leaves: Blue-green, 1–2 inches wide, up to 2 feet long, extending from the stem at 45-degree angles.

Flower/seed head: Large, feathery, purplish-brown plumes at the top of stems in late summer, turning silvery-gray in fall. These are conspicuous and visible from a distance.

Native vs. non-native: NJ has a native phragmites subspecies (Phragmites australis subsp. americanus) that’s much less aggressive and grows in scattered, smaller patches. The non-native subspecies (subsp. australis) forms dense monocultures. The non-native has a bluer-green stem color, denser growth pattern, and rougher stem texture. Most large phragmites stands in NJ are the non-native variety.

Root system: The reason phragmites is so difficult to eliminate. The rhizome network extends 6+ feet deep and spreads horizontally 10+ feet per year. A single rhizome fragment can regenerate the entire stand.

Why it's a problem

Native plant displacement. Phragmites outcompetes and displaces native wetland plants — cattails, sedges, rushes, native grasses — that provide food and habitat for wildlife. A phragmites monoculture has dramatically lower biodiversity than a healthy native wetland.

View obstruction. On properties near ponds, lakes, and low-lying areas, phragmites walls block water views, reduce property enjoyment, and can lower property values.

Drainage interference. Dense phragmites stands in drainage channels slow water flow, trap sediment, and can cause localized flooding. Municipal and HOA drainage maintenance often involves phragmites clearing.

Fire hazard. Dead phragmites stalks are highly combustible. Dense stands of dried phragmites near structures or along road margins pose a wildfire ignition risk, particularly in dry winter and early spring conditions.

Removal methods

Phragmites removal is a multi-step, multi-year process. No single treatment eliminates an established stand.

Step 1: Mechanical clearing (forestry mulching or mowing). The mulcher or mower cuts the above-ground stalks to ground level. This doesn’t kill the rhizome system, but it removes the standing biomass and makes the site accessible for herbicide treatment. Forestry mulching handles phragmites on firm ground — the stalks are hollow and mulch easily. On saturated or standing-water ground, the machine can’t operate and hand cutting or specialized wetland equipment is needed.

Step 2: Herbicide treatment. Glyphosate (aquatic-approved formulation) is the standard herbicide for phragmites. It’s applied to regrowth after mechanical clearing, or as a foliar spray on standing phragmites in late summer (August-September) when the plant is actively translocating to its rhizome system. Timing is critical — too early and the herbicide doesn’t reach the roots. Aquatic-approved glyphosate is required because phragmites grows in and near water.

Step 3: Follow-up for 2–3 years. The rhizome system is resilient. Expect regrowth from surviving rhizome fragments for two to three years. Each year of treatment weakens the rhizome system further. By year three, most stands are eliminated or reduced to scattered, weak growth.

Important: If the phragmites stand is in a mapped wetland or within a riparian buffer zone, NJ DEP permitting may be required for removal activities — particularly herbicide application in or near waterways. Consult with NJ DEP or a licensed applicator familiar with wetland regulations before beginning treatment.

Costs

Small stands (under a quarter acre) around drainage channels, pond edges, or property margins are priced as minimum-charge jobs rather than per-acre.