- How pre-emergent herbicides work<\/a><\/li>
- Types of pre-emergent herbicides<\/a><\/li>
- What weeds do pre-emergents control?<\/a><\/li>
- When to apply pre-emergents<\/a><\/li>
- How to choose the right pre-emergent for your lawn<\/a><\/li>
- FAQ about pre-emergent herbicides<\/a><\/li><\/ul> \t\t\t<\/div> \t\t<\/div><\/div>
How pre-emergent herbicides work<\/span><\/h2>
Pre-emergent herbicides create a chemical barrier in the top layer of soil that disrupts cell division in germinating seeds, preventing proper root and shoot development. Unlike post-emergent herbicides that kill existing weeds, pre-emergents target weeds before they emerge from the soil.<\/p>
\u201cPreemergence herbicides prevent germinated weed seedlings from becoming established; either by inhibiting the growth of the root, the shoot, or both,\u201d says Joe Neal, PhD at North Carolina State University.<\/p>
When the plant cells can\u2019t divide, they can\u2019t multiply, and therefore, they can\u2019t grow or establish themselves in the ground. Without roots or shoots, the seedlings have no access to nutrients or water, so they die, Neal explains.<\/p>
Read more:<\/strong><\/p>
- How to Apply Pre-Emergent Herbicides<\/a><\/li>
- 6 Best Pre-Emergent Herbicides<\/a><\/li> <\/ul>
Types of pre-emergent herbicides<\/span><\/h2>
Preemergent herbicides are available in both granular and liquid forms. Let\u2019s explore their differences:<\/p>
- Liquid<\/strong> weed killer spray is applied using a hose or included sprayer. It offers more precise application, better coverage, flexibility in mixing with other products, and quicker absorption into the soil.<\/li>
- Granular<\/strong> lawn weed killer is applied using a spreader or by hand. It is easy to apply and is well-suited for smaller yards, although application isn\u2019t as precise as with liquid.<\/li> <\/ul>
Most pre-emergent herbicides are synthetic, but for an organic option, corn gluten<\/a> is an effective pre-emergent.<\/p>
In my house, we typically use synthetic granular pre-emergent because it can be more forgiving and I find it easier to apply. While I recognize that liquid pre-emergents also have lots of benefits, granular is best for us at this time. However, we are actively weighing the pros and cons of corn gluten.<\/p>
Read more: <\/strong>Types of Pre-Emergent Herbicides<\/a><\/p>
What weeds do pre-emergents control?<\/span><\/h2>
![\"dandelion](\"https:\/\/lawnlove.com\/blog\/wp-content\/uploads\/2025\/03\/AdobeStock_270965795-2.jpeg\")
Sergey Fedoskin<\/a> | Adobe Stock Free | License<\/a><\/figcaption><\/figure> Pre-emergents control many common grassy weeds and most broadleaf annual weeds<\/a>. They do not control established perennial weeds.<\/p>
\u201cPre-emergent herbicides are generally the most effective chemical option for controlling challenging annual weeds like crabgrass<\/a> and annual bluegrass<\/a>,\u201d says Becky Grubbs, a turfgrass specialist at Texas A&M University AgriLife Extension.<\/p>
Annual weeds complete their lifecycle in one season. Broadleaf weeds have wide leaves with netted veins, while grassy weeds have narrow leaves with parallel veins. Both types spread primarily through seeds and compete with desirable plants for resources. I\u2019ve outlined some common weeds of each type below.<\/p>
- Granular<\/strong> lawn weed killer is applied using a spreader or by hand. It is easy to apply and is well-suited for smaller yards, although application isn\u2019t as precise as with liquid.<\/li> <\/ul>
- 6 Best Pre-Emergent Herbicides<\/a><\/li> <\/ul>
- Types of pre-emergent herbicides<\/a><\/li>
![\"chickweed\"](\"https:\/\/lawnlove.com\/blog\/wp-content\/uploads\/2025\/03\/2514579217_73b61efeed_o-1.jpg\")