A bioherbicide is a weed control product derived from naturally occurring compounds. FireHawk Bioherbicide is powered by nonanoic acid, a fatty acid that we optimize for efficacy. When sprayed on the green parts of the plant it breaks down the outer cell membranes, causing the plant cells to collapse and dry out quickly. The result is a fast-acting, non-selective contact herbicide that only affects the green parts of the plant.

Learn more for your application → Home & Garden | Professional Landscape | Agriculture

FireHawk works on contact to rapidly desiccate weeds, with visible effects often appearing within hours. Unlike systemic herbicides, it does not move within the plant and does not provide residual soil activity. FireHawk affects only the vegetation it directly contacts when used as directed.

See how FireHawk works → How It Works

The active ingredient in FireHawk Bioherbicide is nonanoic acid, a fatty acid that we optimize for efficacy. The remaining ingredients help the spray spread and adhere to plant surfaces for effective contact activity.

View ingredients & label information → Product / Label Info

FireHawk controls a wide range of broadleaf, grassy weeds, mosses and cryptograms. Because it is non-selective, it will affect any green vegetation it contacts.

See the Ready to Use weed list → Weed Guide

FireHawk is fast-acting. Many weeds begin to show visible wilting within hours of application, with full desiccation typically occurring within 24 hours. It works faster on warm, sunny days. Larger or well-established weeds may require follow-up applications.

Learn what to expect → How It Works

No. FireHawk works on contact by dehydrating leaves and stems. It does not move into the root system, so weeds with extensive underground structures may regrow and require sequential applications. FireHawk does not provide residual activity in the soil.

Learn how to manage regrowth → Weed Guide | Agriculture

No. FireHawk does not provide residual weed control in the soil. It controls only the weeds it contacts at the time of application. Only the green parts of the plant are affected.

Learn about post-emergent control → How It Works

FireHawk is non-selective, meaning it will affect any green plant tissue it touches. Spot treatment and shielding are recommended where precision is needed.

Find best practices for your use → Home & Garden | Professional Landscape

Re-entry timing depends on the product and use site. When applying FireHawk Ready to Use, people and pets may re-enter the area when dry. Always follow the specific label directions for the product being used, including any listed restricted-entry interval (REI).

View safety & label guidance → Safety / Label Info

Yes. FireHawk can be used for careful spot treatment in gardens, landscaped areas, and near crops according to label directions. Avoid contact with desirable plants. FireHawk is not recommended for broadcast use on turf, as contact with grass will result in visible injury.

Choose your application type → Home & Garden | Professional Landscape | Agriculture

When applying FireHawk Ready to Use product, people and pets may re-enter the area when dry. FireHawk should be used only as directed on the label. Avoid application to non-target areas and keep people and animals out of treated areas until the spray has dried and any required re-entry interval has passed. Use as directed.

Learn about responsible use → Safety / Label Info

FireHawk Bioherbicide is available online at firehawkbioherbicide.com. Product formats and availability may vary by region. For professional or large-scale use, please contact a FireHawk representative.

Check availability → Shop Now

DPR refers to California's Department of Pesticide Regulation, which oversees pesticide products sold in California. Products registered with DPR have been reviewed for sale and use in the state, subject to California-specific requirements.