I just bought a business Sept 2005 and with the business came 55 accounts. Im trying to mow all the yards and doing everything else in between. My customers want me to fertilize their lawns with weed and feed, but i was wondering, Do i need to fertilize by a certain time or can you fertilize anytime of the year? I live in Southwest Florida right above Ft. Myers. And 90% of my lawns are St. Augustine grass.