You don’t need a professional horticulturist to spell out how harmful weeds are for your lawn.
While not all weeds are the villain that they are painted to be, but a common consensus exists that certain weeds are just too dangerous to lie around undisturbed.
For example, weeds, such as Atropa Belladonna (deadly nightshade), poison oak, poison ivy, jimson weed, poison hemlock, etc. known to infest lawns across North America pose an extreme threat to people and pets who comes in contact with them.
This is why if proper control is not taken at the proper time to eliminate weeds (harmful or not), you risk exposing yourself to more than an unattractive lawn! So, here we will help you with that and educate you on when to apply post-emergent herbicide.
The Basics of Herbicide
And talking about eliminating weeds,there is no better strategy than to use herbicides. Now two types of herbicide are known to take care of most weed problems that present itself in the lawn.
One is the post-emergent herbicide. The other is, of course, the pre-emergent herbicide.
The difference between the two, however, doesn’t lie in their action or methodology in killing weeds. Rather it is the question of “when” to apply them that discerns and directs their usage.
I am sure we have all heard the proverb “prevention is better than cure”, and that is exactly what pre-emergent herbicides are all about.
The vital mission of these herbicides is to prevent the seeds from sprouting and giving birth to weeds in the first place. Hence they are usually applied to the soil in early spring, way before the temperature can spike to 55°F (degree Fahrenheit) or above!
Post-emergent herbicide, on the other hand, is applied when weeds have already taken your lawn under siege. This means the germination of weeds has reached full swing due to soil temperatures reaching 55°F and above, and the grassland is overcrowded with weeds of all stature.
Best Time to Apply Post-Emergent Herbicide
Post-emergent herbicide works best when they are spread on smaller weeds, or on weeds that are in the active development stage.
This is because growing weeds are more vulnerable to absorbing the herbicide down to their roots while presenting an opportunity to spread the medicine among its kin much quicker.
Provided these conditions the optimum time to apply post-emergent herbicide to disarm your turf land of weed infestation are:
- Mid-Late Spring –It is the most ideal time, as weeds enjoy their active-growth phase due to prime soil temperatures of 55°F and above.
- Summer –This is the period when weeds reach their maturity phase and are at their strongest. Although you will need to apply several installments of herbicides to make them fully surrender but it is still worth the effort!
- Fall – Fall is also a good time to spread post-emergent herbicide across your lawn. During this time, the entire plant kingdom is restoring and stocking up to prepare for the upcoming winter. Therefore, it perfectly provides a window of opportunity to bait the stubborn weeds into absorbing herbicides.
Measurements to Apply Post-Emergent Herbicide
Ideal Temperature to Apply Post-Emergent Herbicide is 55°-85° F
Herbicides are ineffective at the face of frozen ground and only works best on weeds at active-growth phase. Also, temperatures higher than 85 degrees Fahrenheit run the risk of the herbicide to getting burned and damaging your lawn.
Apply Herbicides in the Wee Hours of the Morning
As this is the active metabolism period for plants, it helps quicker absorption of the post-emergent herbicide.
Don’t Mow the Lawn before and after Applying Post-Emergent Herbicides
This is more of a precautionary measure. Herbicides get a better degree of absorption when the weeds are in a natural, comfortable state. Hence it is advised not to mow the lawn at least 3 days before and after the chemical application to enjoy optimum results.
Remember, herbicidesimparta stress factor on your lawn. So it is always suggested to analyze the lawn condition before waging war on weeds with such chemicals.
As for the rest, don’t forget to read the labels that accompany your choice of the post-emergent herbicide to prevent unnecessary upsets!