Weeds growing under trees can compete for nutrients and water, affecting tree health. Selecting the right weed killer ensures weeds are controlled without damaging trees.

Applying weed killers under trees requires care to avoid harming roots and bark. Using selective herbicides that target weeds but spare trees is essential.

This article highlights the best weed killers safe for use beneath trees. Combining chemical control with mulching and manual removal improves effectiveness.

Top 10 Best Weed Killers for Under Trees

1. Glyphosate (Careful Spot Application)

Glyphosate is a non-selective systemic herbicide that kills most weeds by disrupting their growth. When applied carefully with spot treatments, it can control weeds under trees without harming them. Avoid spraying tree trunks or roots directly.

Glyphosate breaks down quickly in soil and is absorbed by green foliage. It is most effective on actively growing weeds. Protective clothing should be worn during application.

Repeated treatments may be needed for persistent weeds. Use a shield or targeted applicator to protect tree bases. Always follow label instructions for safe use.

2. Triclopyr

Triclopyr selectively controls broadleaf weeds and woody plants without harming grasses or trees. It is systemic and translocates to roots for effective control. Best applied during the growing season when weeds are actively growing.

Commonly used in forestry and landscape maintenance. It is effective for tough weeds beneath trees. Use personal protective equipment during application.

Spot application reduces risk to non-target plants. It can be mixed with surfactants to improve coverage. Follow all safety and application guidelines.

3. 2,4-D

2,4-D is a selective herbicide targeting broadleaf weeds while leaving grasses and trees mostly unaffected. It disrupts weed growth hormones causing death over time. It is ideal for use under trees with grass cover.

Apply during early weed growth for best results. Avoid spraying on windy days to prevent drift. Protective gear is recommended during application.

Multiple treatments may be necessary for full control. It is an affordable and widely available option. Follow all label instructions strictly.

4. Sethoxydim (Grass-Selective Herbicide)

Sethoxydim targets grassy weeds without harming broadleaf plants or trees. It is absorbed by grass foliage and roots, disrupting lipid synthesis. Useful for controlling grassy weeds under trees.

Apply when grasses are actively growing. Avoid contact with desirable broadleaf plants. Use protective clothing during application.

Repeat treatments may be needed. Often used in combination with broadleaf herbicides. Follow product label for safety.

5. Pelargonic Acid

Pelargonic acid is a contact, natural herbicide that burns weed foliage on contact. It acts quickly but does not kill roots, so repeat applications are necessary. Safe for spot treatments under trees.

Works best on young, tender weeds. It breaks down rapidly in soil and environment. Protective clothing is advised when applying.

Ideal for organic gardening and sensitive areas. Can be combined with systemic herbicides for better control. Always follow label directions.

6. Imazapyr (Use With Caution)

Imazapyr is a broad-spectrum systemic herbicide effective against many weed types. It can harm desirable plants, so spot treatments under trees must be done cautiously. It is absorbed through roots and foliage, providing long-lasting control.

Avoid use near shallow-rooted trees. Wear protective equipment during application. Consult product labels for detailed safety information.

Best suited for tough infestations where other herbicides fail. Residual effects may persist in soil. Strict adherence to application guidelines is essential.

7. Dicamba

Dicamba selectively controls broadleaf weeds by mimicking plant hormones. It is often combined with 2,4-D for enhanced efficacy. Use with care to avoid damage to trees and desirable plants.

Apply during calm weather to prevent drift. Protective clothing should be worn. Repeated treatments may be necessary for persistent weeds.

Suitable for spot treatments beneath trees. Always follow label instructions. Avoid use near sensitive or young trees.

8. Manual Removal with Herbicide Spot Treatment

Physically removing weeds under trees reduces competition for nutrients. Combining this with spot herbicide treatments kills remaining roots effectively. Gloves and protective gear should be worn during manual removal.

Regular monitoring and removal prevent weed re-establishment. Use targeted herbicides to minimize environmental impact. Manual methods support sustainable landscape care.

This approach reduces chemical use and protects tree health. Persistence ensures long-term control. Integrate with mulching for best results.

9. Mulching

Mulching beneath trees suppresses weed germination by blocking sunlight. Organic mulches also improve soil moisture and health. Combined with herbicides, mulching enhances weed control.

Apply mulch 2-4 inches thick around tree bases, avoiding direct trunk contact. Renew mulch annually to maintain effectiveness. Mulching reduces herbicide needs.

Choose natural mulches like wood chips or bark. Mulching improves overall tree vigor. It is a key part of integrated weed management.

10. Vinegar-Based Herbicides (Acetic Acid)

Vinegar herbicides burn weed foliage on contact and are a natural alternative to synthetic chemicals. They are most effective on young weeds and do not kill roots. Suitable for spot treatment under trees.

Use caution to avoid contact with tree roots or bark. Repeat treatments are often necessary. Protective clothing is advised during application.

Organic and safe for many settings. Effectiveness decreases on mature plants. Combine with other methods for best results.

Best Weed Killer for Under Trees (FAQs)

1. Can I use glyphosate under trees? Yes, but only as a careful spot treatment to avoid tree damage.
2. Are selective herbicides safe for tree roots? Generally, yes when applied properly without direct contact.
3. How often should I apply herbicides under trees? Repeat as needed, usually every few weeks during the growing season.
4. Is mulching effective for weed control under trees? Yes, it suppresses weed growth and improves soil health.
5. Can vinegar herbicides harm trees? They may if applied directly; use with caution.
6. Should I manually remove weeds before herbicide application? Yes, to improve effectiveness and reduce chemical use.
7. What precautions should I take when applying herbicides under trees? Use spot treatments, protective gear, and avoid drift onto tree trunks or roots.

Conclusion

Controlling weeds under trees requires careful selection of herbicides that protect tree health while effectively managing weeds. Combining selective chemical treatments with manual removal and mulching provides optimal results.

Spot treatments minimize harm to tree roots and bark. Protective measures and following label guidelines ensure safety for the environment and trees. This integrated approach supports healthy, weed-free tree landscapes.