Will Roundup Kill a Tree? Herbicide Facts

Roundup and Tree Safety

No, Roundup (glyphosate) will not kill a tree from soil runoff or root absorption when used as directed for lawn weeds.

How Glyphosate Works

• Contact herbicide: Must contact green foliage or exposed cambium
• Not soil-active: Binds tightly to soil particles; no root uptake
• No translocation through soil: Cannot move to adjacent plants underground

When Damage Occurs

Trees are only harmed if spray directly contacts:

• Green leaves or young bark
• Freshly cut stumps or wounds (cambium exposure)

Neighbor's Claim

The flowers at the tree base surviving proves the herbicide didn't move through soil. Tree decline likely has another cause (drought, disease, construction damage, etc.).