Answer: Ortho's Weed B Gon contains the herbicide 2,4-D which can be harmful to the roots of broadleaf trees and shrubs as it moves in the soil and overspray can damage the foliage of the trees.. The label does not list dollar weed as a weed that it successfully controls so I don't think it is the right product for your weed eradication project.
Dollarweed, also called Pennywort, is a small broadleaf plant. The best way to get rid of it is to hand pull it from the root.The problem is that it grows in large patches and it replaces itself quickly so that few find pulling it up a reasonable solution. There are, however, a plethora of avenues of attack to try. There are chemicals available including WipeOut by GreenLight which will kill the weeds but not their seeds so multiple applications will be needed. A product called Image is also an option. It contains atrizine and if used as a liquid spray rather than as a granule, you can kill pennywort without damaging the roots of your oaks. Drifting spray can damage the leaves of your plants so apply on a calm day and hold the spray close to the foliage of the dollar weeds.
Best wishes with your eradication project!
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