Originally Posted by gulfjoe
Green doctor, I spot sprayed some Celsius and monument 75 yesterday in my own yard. How long should I wait to turn on the irrigation to be safe? We had a big rain Friday the day before I sprayed, so I am not to concerned about turning them on. I just wanted to know a good safe timeline.
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Celsius and Monument are absorbed into the weeds within 12 hours. The amount you apply is more than enough to kill. Be sure that there is no ponding or run off when you do turn irrigation back on. It could actually be several days before irrigation is needed again.