Organic weed control methods include physical removal of existing lawn weeds and creating future environmental conditions that support the growth of dense, health lawn grass. Weeds are opportunistic and pernicious, capitalizing on unhealthy, sparsely growing lawn grass areas.
Regular inspection and removal of budding lawn weeds prevents spreading and a full-blown invasion. When hand-pulling lawn weeds from the lawn, remove the entire weed including the root. The majority of common lawn weeds--including dandelions, bermuda grass and nuts edge--are effectively removed by hand-pulling.
Incorrect watering can foster an unhealthy lawn environment conducive to weed growth. Both under-watering and over-watering the grass can create poor lawn grass growth which leaves the door open to weed infestation. As a general rule, warm season grasses should be watered once or twice a week and cool season grasses should be watered three to four times per week during the growing season. Heavy, deep, infrequent watering is better for grass growth than continuous, light, shallow watering at regular, frequent intervals.
Lawn grass height is a direct indication of root system depth. Warm season grasses are generally cut to a shorter height of 1 to 2 inches, and cool season grasses are cut to a longer height of 2 to 3 inches. Never mow the grass blades more than 1/3 of their total height when mowing the lawn. Keeping the mower blades sharp will create a clean grass cut that is healthier for the lawn grass.
Heavily trafficked lawn grass areas are highly susceptible to top soil compaction, which restricts the flow of water, oxygen and nutrients to the grasses' root systems and favors the growth of lawn weeds that have a shallower root structure. Aerate the lawn only during the growing season, using an aerating rotor which punctures small, cylindrical holes into the top soil. Lawn areas exposed to high foot traffic should be aerated several times a years ,and areas that experience little or no foot traffic should be aerated once or twice a year.