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Q. How long does it take Roundup to kill Bermuda grass? I have applied it and there doesn’t seem to be any action.
A. Roundup and other contact herbicides designed to work on foliage work best when they are mixed and used exactly as the label describes. For best results, Bermuda grass must be actively growing, not dried out. Apply it in the morning on a sunny day.
In my experience Roundup causes a color change in the Bermuda grass in seven to 10 days with a kill in three to four weeks. The grass-specific contact herbicides, such as Vantage, Fulsilade, Grass-B-Gon, or Over-The-Top, take slightly longer. Sometimes I apply the grass-specific herbicides twice, one week apart, for faster control.
Q. Pecan-shell mulch is inexpensive at area horticulture supply retailers. Is it any good?
A. Pecan shells make an attractive mulch that is very slow to decompose. Fresh pecan-shell mulch attracts fire ants, deer, and birds. They seek to harvest the remnants of pecan meats. The mulch is not one that you walk barefoot on. The shells are sharp.
Calvin Finch is a horticulturist and the San Antonio Water System’s project director of regional initiatives and special projects. Hear him on “Gardening South Texas” on KLUP 930 AM radio Saturdays noon to 2 p.m., and 1-3 p.m. Sundays. Or, e-mail him at firstname.lastname@example.org.
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