Hi Brian -
As with all herbicides be sure to read the label as this will give you specific details. Crossbow is an herbicide which contains Triclopyr same as Brush-B-Gon. For those interested here are a few links with information on this product and other products for control of poison ivy:
Crossbow is made by Dow Chemicals and they do have instructions on their website at http://www.dowagro.com/. According to those instructions you should be able to use this on your grass provided it has a good root system. Also do not seed your lawn for at least 3 weeks after application. This product can be harmful to desired ornamentals so be careful of spray drift.
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