Nature’s Seed is a top seller of North America’s best grass seed for lawn, pasture and wildflower seed solutions. Will Weed and Feed Kill Grass Seed? When to Plant and SprayMany 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 af… ESTABLISHING A NEW LAWN WATER! WATER! WATER! After seeding, water frequently but lightly to keep seed and soil damp. (NOT FLOODED!) This would be 2 to 3 times
How to Fertilize Your New Bermudagrass Seed Lawn
Planting your new lawn from Bermuda Grass seed requires soil nutrients for good growth in addition to water and sunlight. However, not every soil is ideal for providing adequate nutrition for Bermuda grass seeds, especially the low quality soils that typically surround new construction. Fertilizing at the right time of year is necessary for adding supplemental nutrients to help your Bermudagrass maintain its optimum health and beauty after it is established.
Most of the nutrients your Bermuda grass seed needs are already supplied to the roots of your grass in small, trace amounts through natural occurring soil processes. However, Bermudagrass lawns, as with any grass lawn, require three especially important nutrients—nitrogen (N), phosphorus (P) and potassium (K)—in larger quantities than are readily available in most soils. Lawn fertilizers are formulated to provide these nutrients at higher levels than are typically available naturally within most soils.
All commercial fertilizers display three numbers somewhere on their bag, representing its particular combination of nitrogen, phosphorus and potassium. These numbers are the percentages of these nutrients in the fertilizer and are separated by dashes, such as 4-6-4 (or N-P-K). In the example of a 4-6-4 (totaling 14%), the remaining 86% of the fertilizer is made up of filler material (and sometimes other trace ingredients such as calcium, magnesium, iron, etc.) meant to give you the bulk needed to spread the fertilizer evenly over your yard. In the case of an organic based fertilizer, the additional weight is not filler, but organic matter, a much needed soil component in sandy and clayey soils.
Newly seeded Bermudagrass seed lawns need nitrogen, phosphorus and potassium in a much different combination than an already established lawn, and thus most fertilizers are not formulated to meet the needs of a newly seeded Bermudagrass lawn. When planting your new Bermudagrass seeds make sure to select a “starter” fertilizer, or an organic, “slow-release” fertilizer. Do not use “weed & feed” fertilizers intended for use on established lawns, as these include weed preventing chemicals in combination with the fertilizer that can severely damage or kill new seedlings.
The phosphorus and potassium in your fertilizer needs to be easily accessible to the seedlings and so it is best to work the fertilizer into the soil as one of the final steps before spreading your Bermudagrass seeds. To do this, use a seed spreader to apply the fertilizer evenly. Then incorporate it into the topsoil, either manually with a rake and shovel, or mechanically with the use of a tiller. Do not work the fertilizer deeper than 4″ into the topsoil.
About 4-8 weeks after the Bermudagrass seeds germinate you should fertilize your grass again. Do not continue to use starter fertilizer for this second application. The higher phosphorus content of starter fertilizers is an important nutrient right after your grass seed has germinated, but once established, your lawn no longer needs phosphorus at such a high rate. Moreover, phosphorus runoff is a contributor to surface and groundwater pollution. Instead, use either a more traditional type fertilizer, or an organic, slow-release fertilizer such as an 18-1-8 formulation which is better suited for an existing lawn. Use your seed spreader to apply the fertilizer in two directions. Make sure not to over-apply by following the application rate provided on the fertilizer’s packing. Sweep any fertilizer granules that end up on the sidewalk or driveway back onto the bluegrass lawn. Water the lawn immediately after fertilizing to allow the nutrients to filter down through the soil to the roots.
When can you seed after weed and feed – CANNABISGUIDEUSA.COM (2022)
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.
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 Many Days Do You Have to Wait Before Seeding After Weed & Feed?
You want a beautiful lawn for your family to enjoy, but it’s no longer enough to just mow it. You have to fertilize, water, kill weeds and then reseed any bare spots. Using a weed and feed product saved you some time, so now you’re ready to plant some grass seed. You may have to wait a bit longer, though, depending on the type of weed and feed product you used.
Weed and Feed
Weed and feed products consist of fertilizers such as nitrogen or potassium, and a pre-emergent or post-emergent herbicide. If the weed and feed is designed for spring application, it contains a pre-emergent. If it is designed for later in the growing season, it incorporates a post-emergent herbicide. Knowing which one you are using is important because the herbicides affect plants in significantly different ways.
- You want a beautiful lawn for your family to enjoy, but it’s no longer enough to just mow it.
- Using a weed and feed product saved you some time, so now you’re ready to plant some grass seed.
How They Work
Pre-emergent weed and feed is applied in early spring so the herbicide is in place before the undesirable weeds germinate. Pre-emergent herbicide works by inhibiting germination. It must be watered with at least one-half inch of water to move the chemical from the surface into the soil. Post-emergent herbicides, however, must be applied while the weeds are actively growing because for the chemical to work, the herbicide must be absorbed into the plant.
Why You Wait
Since weed and feed products are designed to prevent germination — or to eradicate a living plant — they can, for the most part, have a similar effect on young turf grass. The only exception is the pre-emergent herbicide siduron, which is actually used to assist in seed germination. When using a pre-emergent that does not contain siduron, wait a minimum of two months before seeding. If using a product designed for broadleaf weeds, read the label carefully, because the active ingredient in these post-emergent herbicides have a wider range for the waiting period. Grass can be planted in as little as one month after application for products using 2,4-D to as much as six months for atrazine-based products.
- Pre-emergent weed and feed is applied in early spring so the herbicide is in place before the undesirable weeds germinate.
- Post-emergent herbicides, however, must be applied while the weeds are actively growing because for the chemical to work, the herbicide must be absorbed into the plant.
Proper Seeding Methods
When you are ready to seed your lawn, use a garden rake to remove debris and to break up the surface to ensure the seed comes into contact with the soil. Broadcast the seeds in two directions to ensure complete coverage, and water the ground lightly and often for up to two weeks — keeping the soil moist. Once seedlings have established, gradually reduce the frequency of the watering, but lengthen the amount of time per watering. This will encourage a deep root system for your grass.
NEW LAWN TROUBLES
Thin or Sparse Grass: Can be due to too little seed being applied, poor areas of soil, or poor germination. To solve: 6 to 8 weeks after initial seeding add a thin layer of soil and apply more seed.
Slow Growing or Pale Grass: Can be solved by applying nitrogen. Do not use a fertilizer and weed killer combination at this time because it will burn the newly germinated grass.
Cracks in the Lawn: This is due to lack of water. If a prolonged dry spell occurs, water before cracks appear. If lawn was sodded, keeping it moist for the first few weeks will help prevent shrinkage and cracking between strips.
Hollows: Can be caused by settling or heavy rains. To solve this, top-dress such areas to bring them up to grade with the rest of the lawn. If sodded, lift the sod and fill underneath.
Weeds: Weeds are normal in newly seeded lawns and will occur for numerous reasons until turf is well established. Do not use a selective weed killer for the first 12 months after seeding. Maintaining adequate moisture and fertility should help reduce weed levels. Keeping lawn at proper height (at least 3”) will also reduce weed growth.
If erosion matting has been installed to the area seeded (this is commonly used on slopes or area prone to wash out) do not remove! Erosion matting is also known as straw blanket and will decompose on its own. If you try to pull it up it may damage the seeded area or get caught in mower blades.
Cutting Your New Lawn
The first several times you cut a new lawn, the mower blades should be raised up to the highest setting. Also make sure that your blades are sharp. In the years following, grass cutting should begin in early spring (April) and finish in late fall (October). To help maintain a healthy, weed free lawn, grass height should be at least 3 inches. Often this means cutting twice a week when the grass is growing vigorously, but less frequently during hot or dry periods.
Fertilizing Your New Lawn
A starter fertilizer (numbering approximately 18-12-6) should usually be applied at the same time as the initial seeding or seeding. Then 3-5 weeks later (if seeding in spring), apply another round of fertilizer (numbering approximately 20-0-4). DO NOT apply a pre-emergent before or after seeding is done during the first year of growth.