We recently got an email from a California Buffalograss-er regarding what to do with weeds in your California Buffalograss lawn:

…I planted buffalo plugs in the spring ’10.  I’ve had some setbacks with weeds.  I’ve mowed but have read that mowing should stop before the onset of winter.  I’ve been planning to use roundup in winter during dormancy.  I live in the Central Valley and wonder if I can be assured that the grass would go dormant enough to apply the roundup. Also, can pre-emergent herbicides also be applied at other times?

Thank you, Eric

Here is what we suggested: Depending on the weed types most should go dormant during the winter months and those that don’t can be spot sprayed with Roundup, though you might do that now as Roundup is not as effective when the temps get colder. When the temps get colder you can use a contact weed killer. Prior to spring put down your pre-emergent to prevent as much weed seeds from germinating and continue to spot treat. Fertilize the grass and monitor the weeds as best you can. Once the California Buffalograss can get established you can hold back the water and this should discourage any more weed seeds from germinating in your lawn.