Spring is the time that most homeowners work towards controlling lawn weeds. Pre-emergent herbicides are often used to control crabgrass and other spring germinating weeds. Typically, the best time to apply pre-emergent herbicides for lawn weeds is the middle of May.
Some gardeners are now using corn gluten meal because it acts similar to pre-emergent herbicides by inhibiting weed seeds from germinating. Corn gluten meal also contains a source of Nitrogen fertilizer. For best results,apply 20 pounds of corn gluten meal per 1,000 square feet and lightly water into lawn. Be sure to not apply these pre-emergent herbicides to areas where you have planted seed or plan to plant seeds. These pre-emergent herbicides are not selective for which types of seeds they stop from germinating.
Post emergence herbicides may be applied any time the weeds. The air temperature is 60-80 degrees F, there are no winds, and there is no rain in the forecast for 48 hours. Most effective control of perennial broadleaf weeds is obtained when applied in early fall (August 15-October 15) or in spring (May 1-June 1). For some weeds, repeated application at 20-30 day intervals may be required for control.
The ideal timing for applying corn gluten meal for dandelion control is September. If your weed control approach is to control dandelions in the spring, apply chemical after they have finished blooming in May. The non-chemical option is to manually dig out the plants. A weeding fork, dandelion diggers may be a couple of options for that task. Get as much of the dandelion root as you can so the dandelion does not start growing again.
For reptiles, once the temperature drops to 60-70's, the best time to apply corn gluten meal is September or autumn. But if your method of weed control is in the spring, apply the chemicals while keeping the temperature cool and plant the plant from early to mid-May. Non-chemical methods are to remove the plant or use a weeding rake.
A healthy turf is very important to limit the growth of turf weeds. Improve your lawn while working to slow and eliminate weed growth. Try planting grass into exposed areas of the lawn, fertilizing and aerating the lawn to prevent problems such as soil compaction and withered grass.