Grooming a gorgeous lawn requires persistence and patience as you work to eradicate weeds. Herbicides are a key weapon in the lawn weed control arsenal. Two types of herbicides are commonly used: pre-emergent and post-emergent. The names describe when the herbicide kills weeds. Pre-emergents kill weeds before sprouts emerge from the soil.
How it works…
These herbicides interrupt the process before a sprout pushes through the soil.
A common example of a pre-emergent herbicide is a crabgrass preventer, which prevents crabgrass seeds from establishing new plants.
With pre-emergent herbicides, it’s vital to treat the entire lawn area. If you miss a spot, weeds can sprout there.
For pre-emergent herbicides, timing is critical. You’ll want to apply the chemical prior to the time weed seeds start germinating. If you apply too early, these herbicides will have degraded and are useless when seeds start to germinate.
Weed seed germination occurs when the soil reaches the correct temperature.
Various weeds germinate at different times, so repeated applications of the correct chemical can eliminate the majority of the weeds in any lawn or yard.