Weed and feed-type products apply unnecessary amounts of fertilizer and pesticide to your entire lawn. In reality, only parts of your lawn may need fertilizer and there is no need to broadcast chemicals over your entire lawn to kill a handful of weeds. Consider spot-applying your pesticides or, better yet, hand pull weeds when the number is reasonable. Be sure to read the label and follow all instructions carefully.
Choose organic fertilizers and be careful to not apply before heavy irrigation or a rainstorm, as the fertilizer will wash away into the storm drains, which then enter our local waterways. And why pay good money for fertilizer that is washing down the street?
The bottom line is that weeds and unsatisfactory grass are better handled through renovation than fertilizers and pesticides. Once a year, do a core aeration on your lawn—this will improve water infiltration, drainage, and the oxygen content of the soil. Afterward, topdress with a layer of compost. Finally, overseed with grass seed and watch your lawn go!
Your lawn is an ecosystem, too. By working with nature instead of against it, you can have a healthy, beautiful lawn from the soil up.