Often used alongside fertilizer, pre-emergent is not fertilizer itself. Instead, it is an herbicide that works to prevent grassy weed seeds from germinating. The reason that it is used in conjunction with fertilizer is because the latter is an effective carrier agent for the pre-emergent to bind to. This product is often referred to as weed and feed.
When should I apply pre-emergent?
Can I overseed after applying pre-emergent?
In a word, no. Because newly seeded lawns are still germinating, the pre-emergent can affect germination in the process. More mature lawns are sturdier against the herbicide, so it’s best to wait at least 4 months after planting the lawn to apply the pre-emergent. If you are unsure about the best timeline to follow for your lawn, don’t hesitate to reach out to Loyalty Lawn Care with your questions.
While it is best to over seed in fall, after applying your preemergent, it’s important to give your lawn some time to for the product to lose its effectiveness before moving on to the next step. Therefore you shouldn’t be overseeding immediately after applying this herbicide – it’s best to wait at least 4 months between. If you must seed sooner some detailed prep work must be completed to assure you have a quality seed bed that won’t be harmed by the pre-emergent herbicide.
Most weed & feed products will have temperature restrictions as well, be sure to check the label. Do not apply to water-saturated soils, lawns under stress from drought, disease or prone to injury.
Pre-Emergent herbicides are meant to keep new weeds from germinating and growing. Timing is the key, apply too early and the preventer can become ineffective while weeds are still dormant. Apply too late and seeds may have already germinated. You’re probably most familiar with Crabgrass preventers that are applied in early spring.
Weed & Feed products combine a lawn fertilizer with a weed killer and/or weed preventer in one product. One application does double duty, treating random weeds spread across an entire lawn while also feeding and greening grass. Weed & Feeds come in two basic formulations, granules and liquids. But before you make an application, here are some things you need to know about weed & feed products.
Other Things You Should Know
The “weed” half of “weed & feed” contains some mix of herbicides to kill lawn weeds. Almost all products contain a post-emergent herbicide, but some also combine a pre-emergent herbicide designed to prevent new weeds from sprouting.
In spring, wait to apply until you’ve mowed your lawn two times before applying to be sure it has emerged from dormancy.
…And Ends With Feeding