Weed And Feed New Grass Seed

Will Weed and Feed Kill Grass Seed? When to Plant and Spray Many gardeners often find themselves unsure of how long they’re supposed to wait until they can apply weed and feed to their lawns How Long After I’ve Planted Grass Seed Can I Apply Weed Killer?. Before you plant grass seed, you should always prepare the area by removing any weeds that may be growing in the location. Even with careful preparation of the planting site, weeds can still develop among the newly planted grass seed. Weed killers, … Understanding when and how to fertilize your lawn can help you and your grass stand out from the rest.

Will Weed and Feed Kill Grass Seed? When to Plant and Spray

Many gardeners often find themselves unsure of how long they’re supposed to wait until they can apply weed and feed to their lawns after planting grass seed. Conversely, the issue may be how long one’s supposed to wait to plant grass seed after spraying weed and feed. For both concerns, the answer largely revolves around the type of herbicides found in different weed and feed products.

Can you put weed and feed on grass seed?

You may be having an irresistible urge to spray weed and feed on your recently overseeded turf after spotting one or two weeds sprouting on the lawn. However, the growing seedlings will not be able to survive the strength of the herbicide. If you’re planning to use a weed and feed product with a post-emergent herbicide on your growing turf, wait until the grass roots anchor deeper into the soil and the lawn is established.

Also, some weed and feed products are non-selective, pre-emergent herbicides targeted at preventing weed seeds from sprouting. As such, when they’re applied on a recently seeded lawn even before the grass seeds germinate, they’ll kill the weed seeds as well as the grass seeds.

To control weeds on lawns before the new grass is established, consider alternative measures like spot treatments. You can also manually uproot the weed plants if the infestation is still in the early stages.

Mowing also helps to control weed growth in newly-established lawns, as the grass grows stronger and crowds out more weeds. In fact, it’s advisable to refrain from spraying weed and feed on your new turf until after the third mowing. By then, the grass will be strong enough to withstand herbicides.

However, even then, you should only use a post-emergent, selective weed and feed product. These will easily kill broadleaf weeds like dandelions and clover without harming your turfgrass. Pre-emergent herbicides won’t work on already existing weed plants, while non-selective/systemic herbicides will kill both the weeds and your growing turfgrass.

When to plant grass seed after weed and feed?

The best time to plant grass seed after applying weed and feed depends on whether the weed and feed used contained a pre-emergent or post-emergent herbicide. For weed and feed products containing post-emergent, systemic weed killers, you can plant grass seed as soon as two weeks after application.

That’s because systemic herbicides don’t leave any residue in the soil that might harm seeds grown a few days after. They’re instead absorbed into plants via the leaves and roots, killing the whole plant within 7 days. Common examples of systemic herbicides include glyphosate and pelargonic acid.

Pre-emergent herbicides, on the other hand, are formulated to inhibit seed germination by forming a chemical barricade atop the soil. Thus, if you plant your grass seed soon after applying a weed and feed with a pre-emergent herbicide, they won’t sprout as the herbicide will still be in the soil.

To seed your lawn after using a pre-emergent weed and feed, you may have to wait between 1-6 months, with 2 months being the average wait time. This is due to the wide variation in the duration it takes for different types of pre-emergent herbicides to degrade in the soil. A herbicide like 2,4-D decays in as soon as four weeks, but you may have to wait for six months to plant grass seed on a lawn treated with Atrazine herbicide.

See also  How To Remove Seeds And Stems From Weed

Take note, though, that there are some types of weed and feed products that can be used to suppress weed seeds without affecting grass seed. These products usually contain siduron, a pre-emergent herbicide that also boosts germination of grass seed. If your pre-emergent weed and feed contains siduron as the primary active ingredient, you can sow grass seed right after application.

Note: Always read the labelling on your weed and feed for information on how long you should wait to plant grass seed post-application. The types of herbicides infused into the product usually determines the manufacturers’ wait time recommendations.

How long after seeding can you spray for weeds?

It’s not uncommon to find weeds sprouting and growing on your lawn alongside your new grass seedlings. The right time to spray selective weed and feed on your lawn after seeding is after mowing three times. At this stage, the grass is mature enough to withstand the harsh chemical herbicides inside the weed and feed.

You can also spray a pre-emergent weed killer if the weed infestation is still in the earlier stages. When you start to notice weeds on your new turf, it’s a sign that more weed seeds are present in the ground and are about to germinate.

You should spray a pre-emergent at least 14 days after seeding, after the grass seeds have germinated into seedlings. As such, you’ll be targeting only the weed seeds that haven’t yet sprouted, and not your grass seeds.

Note: Never use a non-selective weed killer on your new lawn, no matter how mature the grass looks, as it will kill all plants it comes into contact with including the grass.

Weed Control Tips after Seeding a Lawn

You can keep weeds out of your lawn after seeding by adopting the proper watering, fertilizing, and mowing practices. Doing so helps your turf grow stronger and stay healthy enough to choke out weeds.

How Long After I’ve Planted Grass Seed Can I Apply Weed Killer?

Before you plant grass seed, you should always prepare the area by removing any weeds that may be growing in the location. Even with careful preparation of the planting site, weeds can still develop among the newly planted grass seed. Weed killers, however, can harm grass seeds and seedlings if applied too early or improperly.

Application Timing

A general rule of thumb is to wait at least until you have mowed the new grass four times before using any standard postemergent broadleaf herbicide. A standard pre-emergent herbicide should not be applied until at least three to four months after seeding the area.

Herbicides and Seeding

Some pre-emergent herbicides can safely be used during seeding and usually come mixed with a seed starter. These products have the active ingredient Siduron – also known as Tupersan – that works by suppressing weed seeds while improving root development of the new grass. The fertilizer and pre-emergent herbicide mix is applied with a drop or rotary spreader using a rate of 2 1/2 pounds per 1,000 square feet. The spreader setting and actual application depends on the brand of starter fertilizer plus weed control you use, and you should always follow the instructions found on the label.

Weed Control after Seeding

You can control weeds in newly planted grass seed and seedlings without the use of herbicides. Manually pulling the weeds by hand when they first appear keeps them from producing seeds and prevents the problematic plants from spreading, according to the University of California Statewide Integrated Pest Management Program website. They suggest keeping the newly planted grass weed free with proper mowing, irrigation and fertilization. Since newly planted turfgrass has short roots, keep the root zone moist by watering the soil lightly. However, avoid over saturating the soil. After the turfgrass has become established, promote deep and healthy root growth by watering infrequently but deeply.

See also  Seeding Weed

Considerations and Precautions

Weed management should be completed before seeding the lawn with a non-selective herbicide seven to 14 days before you till the soil. A second application of the herbicide may be required to kill any weeds you missed during the first treatment. Wait another seven days until tilling the soil if a second application is used.

Remember that all herbicides are different and the exact time you must wait to apply weed killers to newly planted grass will vary from one product to another. Also, some herbicides cannot be applied to certain species of turfgrass. For best results, always refer to the herbicide bottle’s label.

When and How to Fertilize Your Lawn

In some ways, lawns are a lot like people. Operating at the peak of beauty and performance requires a good diet and proper care. Lush, thick, green lawns depend on properly timed, properly balanced nutrition to look and grow their best. Understanding when and how to fertilize your lawn can help you and your grass stand out from the rest.

Starter fertilizers help your new seed or sod get started right.

When and How to Fertilize New Grass

If you’re starting a new lawn from seed, sod or plugs — or you’re doing bare lawn spot repair — a starter fertilizer helps grass get the perfect start. Unlike established lawns, new grass benefits from extra phosphorus, an essential plant nutrient that supports strong, deep roots. Some states only allow phosphorus-containing lawn fertilizers on new grass, so check with your county extension office if you’re unsure.

On fertilizer products, phosphorus is the middle number in the N-P-K ratio — usually “0” in normal lawn fertilizers. But with Pennington UltraGreen Starter Fertilizer 22-23-4, you get an ideal ratio of nitrogen, phosphorus and potassium, plus other essential lawn nutrients, including iron for deep green color. This premium fertilizer blend starts feeding new grass immediately and keeps feeding it for up to three months.

Always follow guidelines for the best time to plant grass seed for your region and grass type, then fertilize accordingly. For seed or plugs, apply fertilizer with a regular lawn spreader before you plant. If you’re starting a lawn with sod, fertilize after your sod is in place.

With any new lawn area, avoid using crabgrass preventer fertilizers or weed & feed fertilizers within four weeks before planting time. After seeding, wait until your new grass gets established and you’ve mowed your lawn at least three times.

Weed & feed fertilizers kill tough weeds and feed your lawn.

When and How to Fertilize Established Lawns

To keep your existing lawn looking its best year-round, choose a fertilizer plan that meets its changing seasonal needs. At Pennington, we make it simple for northern and southern lawns. Just follow our four-part annual lawn fertilizer program:

Part 1 – Early Spring

Between February and April, temperatures warm and weed seeds start to germinate. Prevent new weeds — and feed your lawn in the process — with Pennington UltraGreen Crabgrass Preventer Plus Fertilizer III 30-0-4. You can stop new weeds before their roots get established and control new weeds for up to five months.

Timing is critical for this step. Make sure it’s applied before crabgrass seed germinates — that happens when soil temperatures reach 55 degrees Fahrenheit. For best results, apply with a spreader to actively growing turf and give your lawn at least .5 inch of water from rainfall or irrigation within 14 days.

On top of weed control, Pennington UltraGreen Crabgrass Preventer Plus Fertilizer III 30-0-4 delivers iron and fast-acting nitrogen for immediate greening, and slow-release nitrogen for extended feeding for up to three months. Always follow the label instructions for your specific grass type. Do not apply this product within 60 days of overseeding. Wait until the following year before treating new sod.

See also  Big Bud Weed Seeds

Part 2 – Late Spring

Between April and June, existing weeds launch into active growth. Weed & feed fertilizers combine broadleaf weed killers with nutrients to feed your actively growing lawn:

    treats northern and southern grasses to kill more than 250 weeds from tip to root. It feeds your lawn essential nutrients for thick growth and rich color. Plus, it keeps feeding for up to three months. , designed especially for southern lawns, kills tough existing weeds* and keeps controlling new weeds for up to three months. And while it does that, this product keeps feeding your lawn the essential nutrients it needs.

Always check weed & feed labels for your specific grass type and follow instructions carefully. Weed & feeds are most effective when weeds are young and small. For best results, apply the product in the early morning when grass is wet with dew and no rain is forecast for one to two days.

If you plan to overseed, avoid weed & feed for four weeks before. After overseeding, wait until your third mowing occurs. For sodding, sprigging or plugging, wait four weeks before you weed & feed so new grass can start without delay.

Part 3 – Summer

Between June and August, proper feeding helps strengthen lawns against heat and drought. Keep your lawn beautiful and resilient with Pennington UltraGreen Lawn Fertilizer 30-0-4. This premium lawn fertilizer, ideal for northern or southern lawns, keeps feeding for up to three months. Your lawn gets essential nutrients, including iron for rich color, and you get thick, lush green grass.

Always check the label for your specific grass type, then follow instructions accordingly. Used as directed, you can apply Pennington UltraGreen Lawn Fertilizer 30-0-4 to wet or dry lawns and not worry about fertilizer burn.

Part 4 – Late Summer to Late Fall

Between August and November, grass slows down and prepares for the winter months. At the same time, broadleaf weeds start active growth again. With Pennington UltraGreen Winterizer Plus Weed & Feed Fertilizer 22-0-14, you can feed your northern or southern lawn nutrients essential to its winter prep and spring green-up — and kill broadleaf weeds. As a general rule, allow six to eight weeks between fertilizing and your first expected frost.

As with all fertilizer products, check the label and follow instructions for your specific grass type. If you’re overseeding, wait until next year for weed & feed. Instead, turn to Pennington UltraGreen Lawn Fertilizer 30-0-4 for the year’s final feeding.

Always sweep excess fertilizer off sidewalks and patios to avoid runoff.

How to Apply Lawn Fertilizer for Best Results

Whenever you apply fertilizer, always follow best practices for fertilizer safety. For best results, mow your lawn one to two days beforehand. Then set your spreader to the setting recommended on the product label.

  • For drop spreaders, start with two strips across your lawn’s ends. Then work back and forth, overlapping each swath slightly.
  • For broadcast spreaders, start on the outside and work in, overlapping slightly as you go.

Always shut the hopper when you stop and turn to prevent a fertilizer pile. When finished, sweep excess fertilizer off hard surfaces, such as sidewalks and driveways, to avoid iron stains and fertilizer runoff.

By following these lawn fertilizer tips, you can keep your grass at the peak of performance, beauty and health. At Pennington, we take pride in providing you with the best in lawn fertilizers and expert advice to help you have a lawn you’re proud to own. Stay connected with our email newsletter for accurate, timely tips and offers to help you make the most of your lawn and home.

*dollarweed, clover, henbit and chickweed

Always read product labels thoroughly and follow instructions, including specific guidance for your grass type.

Pennington is a registered trademark of Pennington Seed, Inc.

UltraGreen is a registered trademark of Central Garden & Pet Company.