Q&A: Killing Dollar Weed
It's hard to kill weeds without affecting your plants, but there are a few things you can do to save them.
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Q: What would kill (forever, if possible) dollar weed that's growing with my pachysandra? It's almost impossible to pull up before you pop it off. Can I apply an herbicide without hurting the pachysandra? I also have an overabundance of oxalis that I would love to permanently destroy. Any suggestions?
A: Unfortunately, there's no post-emergent herbicide that will target your weeds without risking your plants. You might try a pre-emergent herbicide to prevent the oxalis from reseeding. The best approach would be to mulch well after you hand-pull the weeds and then make sure that any new oxalis and dollar weed face stiff competition. Apply a foliar fertilizer to the pachysandra, and if there are any "dead" spaces in your bed, put in more pachysandra (or other desired plants).
Master gardener Paul James discusses how unexpected weeds may become residents in your yard and how to get rid of them.