No—not as a dependable weed-control method. Baking soda may injure plant foliage, but leaf damage does not show that a weed’s roots or underground stems have been killed. Extension guidance also warns that household products used this way can harm desirable plants, turf and soil. There is no supported baking-soda weed-control dose in the sources cited here.
Why baking soda may damage a weed without killing it
Baking soda, or sodium bicarbonate, is often promoted as a homemade herbicide. UC Weed Science classifies it among home-remedy substances used as contact treatments: they act on the plant tissue they reach rather than moving through the plant to underground structures. That distinction matters because a weed can lose or damage its leaves and still regrow from surviving roots, rhizomes or tubers. UC Weed Science’s 2015 discussion of homemade herbicides explains why visible injury is not the same as lasting control.
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UConn Extension makes the same broader distinction when discussing homemade pesticide remedies: contact injury does not necessarily control roots, so plants may return. That is general context, not a baking-soda-specific weed-killing trial. UConn Extension’s homemade-pesticide guidance was updated in July 2024.
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Baking soda is not evaluated or labeled as a weed killer in the Wisconsin Extension guidance. Household products used as weed-control remedies can harm turf, other non-target plants and soil, and the guidance does not establish a safe baking-soda application rate. A substance that injures a weed may also injure plants you want to keep.
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- FAST-ACTING WEED CONTROL: This weed and grass killer spray absorbs on contact to produce results in just 15 minutes, allowing you to reclaim your outdoor spaces including walkways and driveways, under trees, and in landscape beds
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Sodium bicarbonate also has uses unrelated to weed control. The University of Florida IFAS discusses it as a fungicide for plant diseases and notes that concentrated or repeated use can damage foliage. That is evidence of potential plant injury, not evidence that baking soda reliably kills weeds. UF/IFAS’s overview of natural products for managing landscape and garden pests covers that different use.
What to do instead
For an isolated weed
Hand removal is a practical option when there are only a few weeds. Remove as much of the plant and its root system as practical, especially for established weeds that may regrow from underground parts. A December 2025 UC Cooperative Extension newsletter discusses hand removal in greenhouse weed management; that supports manual removal as an option, not a head-to-head trial for home gardens. Read the UCCE Winter Extension Newsletter 2025.
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- KILLS WEEDS AND GRASSES: Use on driveways and walkways, and around fences, trees, flower beds, shrubs and other listed areas
- ACCUSHOT SPRAYER: Includes continuous power sprayer with extendable wand
- KILLS THE ROOT: Visible results as fast as 3 hours — replant new flowers, trees and shrubs the same weekend
- RAINFAST: Rainfall or watering 15 minutes after application will not wash away effectiveness
For broadleaf weeds in a lawn
First identify the weed and confirm that any treatment is labeled for both that weed and the lawn site. Wisconsin Extension describes iron HEDTA products for certain broadleaf lawn weeds. This is not a universal lawn treatment: the permitted weeds and use sites depend on the specific product label. Follow that label. Wisconsin Extension’s broadleaf lawn weed guidance, published October 1, 2026, discusses these choices.
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- A reliable baking-soda method for killing weeds or preventing their return.
- A safe or effective baking-soda dose for lawns, garden beds or other sites.
- An efficacy percentage, success rate or controlled trial showing baking soda kills weeds.
Because those points are not established, a recipe or rate would imply a level of effectiveness and safety that the cited sources do not support.
Quick Recap
Best Value
- Roundup Weed & Grass Killer₄ kills tough weeds and grasses to the root, including dandelion, crabgrass, poison ivy, clover (red & white), spotted spurge, and other broadleaf weeds
- It is rainproof in as fast as 30 minutes and produces visible results in hours
- Allows for planting 1 to 30 days after application (see booklet for details)
- Use in or around flower beds and perennial landscape plants, around trees and shrubs, on patios, walkways, and driveways, gravel, or mulch beds, along fences and foundations, and edging around foundations and retaining walls
- The Pump ‘N Go 2 Sprayer with an extendable wand provides up to 10 minutes of continuous spray and provides greater accuracy without bending over
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- Coverage - Preen Garden Weed Preventer provides weed control for up to 2,560 sq. ft. This preemergent herbicide prevents weed seeds from germinating for up to 3 months when applied around established flowers, vegetable, trees, mulch & shrubs
- Application - Use hand spreader, included applicator scoop, or fertilizer spreader to distribute ready-to-apply granules over gardens. Remove existing weeds, sprinkle across garden soil in spring, summer, or fall seasons & water thoroughly
- Compatibility - Professional grade granular Preen weed preventer works with over 200 established flowers, vegetables, trees, and shrubs in planting beds without harming existing plants when applied according to manufacturer directions and guidelines
- Specifications - Professional grade Preen weed stop product contains an effective active ingredient in granular form. Our 16 lb. drum measures 7 x 12 x 14.5 inches for convenient storage and easy handling during application process
- Prevention - Preen weed preventer granules create a protective, soil-activated barrier that stops weeds before they start and prevents weed seeds from germinating for up to 3 months, reducing time-consuming hand-weeding for home gardeners' plants
Rank #3
- Visible Results in One Hour - Spruce dehydrates to kill roots, showing visible results in just 1 hour, dead weeds in 1 day. The hardworking weed sprayer can kill all types of broadleaf and grassy weeds including dandelions, large crabgrass, white clover, dollarweed and morning glory vines.
- Ready to Use Worry-Free Formula - Spruce grass and weed killer is safe to use around people, pets, and bees when used as directed, and one bottle can treat up to 400 weeds. This versatile weed killer spray is made with water, essential oils and surfactant.
- No Mixing Formula - Eliminate measuring, pouring, or diluting for quick and convenient spot treatment on lawns and gardens with 64 oz of our refillable herbicide. For best results, use at the first sign of weed growth.
- How to Use - Slide switch to 'Unlocked' position and hold paddle until product sprays. Hold the weed sprayer nozzle twelve inches from weeds, and spray the entire plant until it is thoroughly wet. After use, slide to 'Locked' position. Reusable sprayer works for up to 5 years (20 uses/year).
- The Snap and Spray Kit - This simplified grass and weed killer kit comes with 2 additional AA batteries to power the reusable wand and 64 oz bottle of our no-mix, no-pour, no-mess herbicide. Try our newly formulated EZ-AIM weed killer spray as well for precision in tough cracks and edges.
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