dollar weed - Knowledgebase Question

Little Rock, Ar
Question by danaparisie
March 25, 2010
We have st.augustene grass.Last year we got infested with dollar weed.We were not able to find a weed killer that would not harm our grass.We live in central arkansas.HELP!!!

Answer from NGA
March 25, 2010


Dollarweed, also called Pennywort, is a small broadleaf plant. The best way to get rid of it is to hand pull it, roots and all. The problem is that it grows in large patches and it replaces itself quickly so that few find pulling it up a reasonable solution. There are, however, a plethora of avenues of attack to try. Reduce the frequency of watering your St. Augustine grass. According to the University of Florida IFAS, research done in 2002 found that reducing irrigation cuts back on dollarweed infestation and its spread in St. Augustine since the weed thrives in moist conditions. Or, apply an herbicide like atrazine. Atrazine should be applied twice a year, once in the fall and then in late spring. Atrazine is a pre- and post-emergent, which means it controls emerging weeds and weed seed. Or, a product called Image is also an option. It?s especially good for use with St. Augustine grass. Be sure to read the entire label and following application instructions so you won't hurt your lawn. Good luck with your eradication project!

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