Red Sorrel in my Juniper ground cover
I have a dense bed of Blue Rug juniper groundcover that has been invaded by Red Sorrel (aka Sheep Sorrel). The Red Sorrel grows up through the juniper, and when I try to pull it out it just breaks off at the roots. I did some research into Red Sorrel and the most common recommendation is to use a selective herbicide -- however, while the so-called selective herbicides claim they won't kill grass, none of them say anything about whether they will kill juniper. I even emailed one company and they said they could make no promises as they only test their product for safety on lawns, not other types of groundcover plants. The only idea I can come up with is to use the herbicide in a very small spot and look carefully for signs of damage to the juniper before using it on a larger area. Any other suggestions for dealing with this problem would be greatly appreciated.