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Cooter
08-28-2008, 02:36 AM
When is it too hot or dry to spray for weeds? Do you want the lawn actively growing. I have held off on a few yards due to it being so dry and the lawns are dormant.

greendoctor
08-28-2008, 02:44 AM
Yes, Yes and very good of you to leave dormant grass out of the spray round. I personally, will not take a lawn account if it is not on an automatic irrigation system. Why? Honolulu, Hawaii has 365 day growing season and less than 20 inches of rain per year.

garydale
08-28-2008, 08:46 AM
We do not spray stressed lawn overall but, we do spot spray certain weeds because they are still actively growing.

Read the label.

ro1207
08-28-2008, 09:29 AM
Most herbicides have a threshold of around 85 degrees as a max temp, but just as important you need to judge the condition of the turf. if it is 70 degrees and you have not seen rain in a couple of weeks and the lawn is stressed don't spray, you may see damage even with this type of weather condition

americanlawn
08-28-2008, 07:26 PM
It's rare that you cannot kill weeds, but when we're in a drought situation, weeds become nearly as dormant as the turf...."ester" herbicides usually work. Amines often have little affect when weeds go into dormancy. Just got some rain testerday -- hope it made it up your way. Good luck.