Weeds in Pachysandra
I have a large bed of pachysandra that has weeds in it. Is there a spray I can use to kill the weeds without harming the pachysandra?
Baltimore County Maryland
There is no herbicide that will selectively kill weeds growing in pachysandra. Weed killers fall into large general categories--grass, broad-leaved, and total vegetation killers. You would need to use a broad-leaved weed killer, and your plants have broad leaves. As a last resort you could paint glyphosate on the weeds. This is systemic and kills everything. You would have to shield the pachysandra from this.
We'd recommend that you weed by hand and then mulch the bare areas. Any bare soil will always produce weeds. Mulch should not touch your groundcover plants, and be no more than several inches deep.