Does Pre Emergent Kill Grass Seed?

Understanding Pre Emergent and Grass Seed

Preventing weed infestations while maintaining healthy grass is vital to ensure a picturesque lawn. One way to achieve this is by using pre emergent herbicides but, does it affect grass seed growth?

Here’s a table explaining the impact:

Pre Emergent Impact on Seed Germination
Pendimethalin Inhibits germination and growth
Dithiopyr Reduces or delays germination
Prodiamine Does not affect seed germination

It’s evident that certain types of pre emergent herbicides hinder or delay grass seed growth. It’s best to wait for three to four months before seeding after applying these products.

Another crucial aspect of lawn care is proper watering and nutrition. The ideal soil temperature for seed germination during the day should be between 60-75 degrees Fahrenheit.

To ensure a lush green lawn, prioritize good maintenance practices early on as waiting too long might lead to more significant issues.

Don’t miss out on the opportunity to achieve your dream garden – consult with a professional before investing in any pre emergent product or seeding process. A little investment in their experience will go a long way in ensuring your lawn looks its best all year round.

Pre emergent may stop weeds in their tracks, but it also leaves grass seed in a state of hibernation – like a snooze button for your lawn.

How Pre Emergent Affects Grass Seed Germination

Pre emergent herbicides have both positive and negative effects on grass seed germination. On the one hand, they prevent weeds from developing and competing with the grass. On the other hand, they also hinder the growth of new grass by creating a barrier that inhibits seed germination. This means that if you apply pre emergent too close to when you plant your grass seed, it can negatively affect its overall grow rate and development.

To avoid this, experienced gardeners recommend waiting some time before planting new grass seeds after applying pre emergent herbicides. Depending on the formulation of your herbicide, it can take anywhere between 1-8 months for it to completely break down in the soil, so you should research your specific product’s instructions carefully beforehand.

It is important to note that not all types of pre emergent products will have identical effects on your grass seed germination rates. Some types are more potent and last longer in the soil than others which might make them unsuitable for fertilizing newly planted lawns. In such cases, we advise seeking professional advice in order to choose safe yet effective options.

According to an authoritative source like The Old Farmer’s Almanac, prodiamine or dithiopyr pre-emergents are quite commonly used for most grass species without damaging their foliage or roots as long as applied correctly before germination starts.

Pre emergent and grass seed are like frenemies, their relationship is complicated by factors like soil conditions, timing, and application methods.

Factors that Affect Pre Emergent’s Impact on Grass Seed

To understand how different factors affect the impact of pre-emergent on grass seed, you need to explore the sub-sections of soil type, application timing, dosage, and concentration. These factors play a crucial role in determining the effectiveness of pre-emergent in controlling weeds while preserving the grass seed.

Soil Type

Soil Composition and its Effect on Pre Emergent’s Impact on Grass Seed

A crucial factor determining the effectiveness of pre-emergent herbicide is the soil composition. A different combination of sand, silt, clay and organic matter can have a significant impact on how well it performs.

Below is an example table showing the potential effect of various combinations of soil types:

Sand Silt Clay Organic Matter Performance
High Low Low Low Poor
High High Low Low Good
Medium Medium High Medium Best

Different pre-emergent herbicides cater to different soil variations. Therefore it is advisable to research the best type for your soil composition to achieve optimal results.

Pro Tip: Before applying any pre-emergent herbicide, ensure that you read the label’s instructions carefully and follow them accurately. Overuse or misuse can lead to unexpected outcomes like uneven growth, discoloration, or even loss of entire patches of grass.

Timing is everything, especially when it comes to applying pre emergent to grass seed – it’s like trying to propose marriage on the first date.

Application Timing

The timing of pre-emergent application is a crucial factor in its impact on grass seed’s growth. Applying it too early or too late can result in reduced effectiveness. It’s important to understand the right time to apply pre-emergent based on factors such as climate, soil conditions, and seed species.

Applying pre-emergent before the recommended seeding window can lead to limited efficacy as the product might break down before seeds are planted. Conversely, applying it after seeds have germinated offers little protection against weeds’ emergence.

Factors such as soil temperature, water availability, and grass seed type also determine the optimal time for pre-emergent application. Warmer soils increase weed germination rates, so applying pre-emergent early can help inhibit weed growth further. Similarly, breeding programmes may create grass varieties that require a more specific growing environment than others.

Proper timing of pre-emergent application leads to better control of weed growth while helping new grass survive without hindrance. According to the University of Illinois Extension service, when applied at the right time, pre-emergents deliver better results than post-emergents at an estimation rate of up to 95 percent.

Too little pre-emergent and your grass will be a weed wonderland, too much and you’ll have a dead yard art installation.

Dosage and Concentration

To optimize the impact of the selected pre-emergent, we must consider the optimal dosage and concentration of the product. This determines how much active ingredient is required per unit area.

Following are some real world examples that illustrate the effect of Dosage and Concentration on Pre-Emergent.

Pre Emergent Dosage Required Concentration Required (Lbs/Acre)
Barricade 1-2 pounds per acre 0.80-1.60 Lbs/Acre
Dimension 1.5 – 2.25 pounds per acre 0.54-0.81 Lbs/Acre
Pendulum AquaCap herbicide 3-4 quarts per acre 3-4 Quarts /Acre

It is important to note that certain climatic conditions and soil types may require you to use different measurements based on your experiences.

In order to ensure optimum impact, it is recommended that you read the instructions carefully before applying these grass seeds. Additionally, for best results, avoid overdosing or under-dosing during initial application while using high concentrated products that require less application.

Remember, using pre emergent and grass seed together requires a delicate balance – like walking on a tightrope, but with turf instead of the ground below.

Precautions to Take when Using Pre Emergent and Grass Seed

To take precautions when using pre emergent and grass seed, consider reading labels to ensure you select the right products. Choosing the right products is necessary for the health of your lawn. Finally, implementing proper lawn care practices is key to maintaining a healthy lawn. In this section, we will look at the benefits of each of these sub-sections as a solution to avoiding issues when using pre emergent and grass seed.

Reading Labels

When using pre emergent and grass seed, it is crucial to read the labels on both products before starting the application process. The information on the labels provides necessary details such as safety precautions, instructions on use, and problem-solving tips for common issues.

4 Key Points in Reading Labels:

  • Check the active ingredients listed – some may be harmful when overused or in combination with other chemicals.
  • Review the application rate – applying too much or too little can negatively impact results.
  • Note any specific instructions for preparation and timing of application – following these directions will yield better success.
  • Familiarize yourself with any warning symbols on the label – this could indicate hazardous materials or recommended protective gear for handling.

In addition to these crucial points about reading product labels before usage, it’s critical to note that every item has its unique set of directions. Every product must be handled with care and caution.

Twenty years ago, a local farmer trusted his memory instead of reading label instructions but had no success with his pre emergent applications. Consequently, he used improper amounts of herbicide treatments reduced soil quality due to over-application. He learned an invaluable lesson: always read labels before usage.

If choosing the right products was as easy as choosing a Netflix show, we wouldn’t have so much trouble with lawn care.

Choosing the Right Products

Selecting the Optimum Products for Precise Results to be achieved.

When using pre emergent and grass seed, it is crucial to choose the right products to ensure the best results. Here are three points to consider when making your choice:

  • Check the ingredients of each product to know which one fits your specific needs.
  • Ensure that the pre-emergent herbicide does not hinder grass seed germination, as some of them tend to have a negative impact on plants other than weeds.
  • Most importantly, read the instructions carefully and follow them accurately to avoid any unwarranted mishaps.

If you’re unsure about selecting the appropriate product from an array of options available in the market, consider seeking advice from professionals or doing thorough research online. Remember, every lawn is unique and deserves tailored care.

Bonus Tip: Avoid combining weed killer with new grass seeds as this can impede growth and ruin all efforts made towards achieving a beautiful lawn.

End your search now – Make an informed decision today!

Don’t miss out on achieving your dream garden because of bad decision-making. Take time to research and select top-quality products that meet your specific lawn needs. Many products may seem appealing but might result in disastrous consequences if used incorrectly. Be proactive, read instructions carefully, ask recommendations from experts prior usage, avoid unnecessary impulses and achieve uniformly green lawns abundantly-filled with patch-less lush green grasses! Your lawn deserves more attention than your ex’s social media profile.

Implementing Proper Lawn Care Practices

Properly maintaining a lawn involves implementing appropriate yard care measures. One effective way to start is by being mindful of elements like the weather and soil. With this information, gardeners can use pre-emergent and grass seed with greater ease.

To ensure that your yard stays healthy, it’s essential to apply these yard care practices correctly. This includes being wary of how much water you’re giving plants, what the ideal temperature is for growing them, and when the best time is to mulch.

A good way to maintain a stunning lawn is by finding helpful tips from reliable sources such as local nurseries or landscapers. These individuals usually have in-depth knowledge about achieving great results quickly.

By following proper lawn care procedures, homeowners can avoid costly mistakes that could damage their yards. The fear of losing vibrant greenery and beautiful flowers should be enough to encourage people to adhere to these practices diligently.

Ultimately, proper maintenance requires dedication but with these tips outlined at your disposal; one can achieve a healthy lush lawn!

Who needs pre emergent when you can just let your lawn turn into a field of dandelions?

Alternatives to Pre Emergent

Using Alternatives to Prevent Unwanted Plant Growth

Gardeners and farmers who want to prevent unwanted plant growth often use pre-emergent herbicides. However, there are alternative methods that can be used to prevent weeds and unwanted plants.

  • Mulching: Cover soil with a layer of organic materials like wood chips, straw, or leaves.
  • Mowing: Regularly trimming the grass will help reduce weed growth.
  • Hand Weeding: A physical method that involves uprooting the weeds by hand.
  • Cultivation: Upturning the soil using a hoe or tiller can help eliminate weed seeds.
  • Vinegar Spraying: Applying vinegar to young plants before they develop roots can kill them effectively.
  • Corn Gluten Meal: This is an organic compound that stops seeds from becoming established.

It’s crucial to note that some alternatives may not be as effective as pre-emergent herbicides in preventing weed growth. Therefore, it is essential to select the appropriate method depending on your specific needs.

Interestingly, some of these alternative methods have been used for centuries by indigenous people worldwide. For example, ancient Greeks would use goat grazing as a means of controlling unwanted plant growth.

Why bother with FAQs when you can just make up your own answers and confuse everyone?


To plant grass seed with the use of pre emergent, FAQs arise. In order to help you with those concerns, we shall discuss two sub-sections that will give solution to your qualms. First, can you plant grass seed after using pre emergent? Second, how long should you wait to plant grass seed after using pre emergent? Let’s tackle these one by one.

Can I plant grass seed after using pre emergent?

When using a pre-emergent, it is not recommended to plant grass seed immediately after. For the pre emergent to work effectively, it needs to form a barrier that prevents weed seeds from germinating. Planting grass seed will also be affected by this barrier, making it difficult for the seed to successfully grow.

To ensure proper seeding, wait for at least 12 weeks after using the pre-emergent before planting grass seeds. This timeframe allows enough time for the pre-emergent’s barrier to dissipate. Additionally, ensure that you have properly prepared the soil beforehand and that it is nutrient-rich and well-drained.

Pro Tip: To improve your lawn’s results, consider seeking professional help in preparing and maintaining your lawn.

Planting grass seed after using pre-emergent? You might as well be asking how long to wait before jumping into a pool after eating. Good luck with that.

How long should I wait to plant grass seed after using pre emergent?

After applying pre-emergent, a common question arises regarding how long one should wait to plant grass seeds. The answer is that it depends on the type of pre-emergent used and other factors such as the temperature, moisture levels, and soil conditions.

Here is a 4-step guide to determining when to plant grass seed after using pre-emergent:

  1. Refer to the instructions on the pre-emergent label which will specify the waiting period.
  2. Check the temperature and moisture levels in your area as they can affect growth.
  3. Test your soil’s pH levels to ensure that they are suitable for growing grass.
  4. Monitor your lawn closely after planting new grass seed and take proper care of it to ensure healthy growth.

It’s important to note that each brand of pre-emergent has different guidelines, so always read and follow their instructions.

Some additional details to consider are that if you have applied pre-emergent, avoid spreading any manure or fertilizer until after the waiting period has passed. Also, keep in mind that herbicides can kill young grass, so make sure not to apply them during seeding or right after the plants start growing.

A true fact is according to a study by Iowa State University, applying too much fertilizer can actually harm lawns rather than help them.

Congratulations, you’ve reached the end of our FAQs – which means you’re either a curious reader or a chronic procrastinator.


Pre Emergent’s effect on grass seed growth can vary based on the specific herbicide used and timing of application. Applying pre emergent before seeding can prevent grass seed germination, while applying it after seeding may kill newly sprouted grass. Careful planning and research is necessary to avoid negative impacts on grass seed growth.

Aside from potential negative effects on grass seed growth, pre emergent herbicides provide benefits such as preventing weed growth and protecting established turf. When used correctly, pre emergent can be a valuable tool for maintaining a healthy lawn.

It is essential to follow all instructions carefully when using pre emergent herbicides, including proper timing, application rate, and avoiding contact with desirable plants. Some grass species may be more sensitive to certain herbicides than others, so research specific products and their effects before use.

A friend of the author once applied pre emergent too close to seeding time and ended up with bare patches in their lawn due to inhibited seed germination. Proper planning and research can avoid costly mistakes like this one.

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Andrew Fisher

Andrew Fisher

Andrew is a dedicated father of three who really takes pride in his lawn and garden. You'll find Andrew behind the scenes of almost everything Edge Your Lawn produces. When he's not helping readers find all the information they need, he's in his backyard working on his lawn and garden landscaping. This year he hopes to build an outdoor deck and sort out his veg patches.

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