Some of my yards seem to be particularly infected with small tree weeds popping up in the lawn. This has been going on all year. I treated the lawns with Dimension in the spring. Momenetum FX seems to have little affect on them now. They are just slightly lower than the grass and do not get mowed. I cant identify the type of tree(s) due to the very small leaf. How can I prevent this next year and what it a good product to take them out now?