Answer: Weeding between junipers is a prickly job at best! One method of control would be to carefully use glyphosate on the grass according to the label instructions. However, this is a non-selective herbicide and should not be allowed to contact the junipers, so sounds like it may not be an option here. It also would not prevent new grass from growing. Another approach would be to place newspaper or cardboard topped by layer of mulch around, in and under the junipers and over top of the grass. This will exclude light and eventually smother the grass. It would also prevent new plants from any seeds already in place. If you continue to top up the mulch periodically this should keep new weed seeds that have blown in from elsewhere from germinating, also. Eventually, the junipers should be thick enough to smother any weeds all on their own and the cardboard or newspaper will rot away.
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