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scotts weed and feed with new grass seed

A well-kept, healthy lawn should be plush, free of weeds and diseases, and as green as the neighbors’ envious hearts. Weed and feed products are designed to provide needed nutrients to the grass while poisoning weeds that want to steal the lawn’s food. Scotts Super Turf Builder with Plus 2 Weed Control works on several species of lawn grasses. While the company’s website recommends waiting four weeks to put down grass seed after applying the weed and feed, seeding first means waiting a different length of time before you use the product.

Scotts Super Turf Builder with Plus 2 Weed Control, now called simply Super Turf Builder with Weed and Feed, contains more nitrogen and phosphorus than plain Turf Builder Weed and Feed, to provide faster green-up. Super Turf Builder contains 29 percent nitrogen, 2 percent phosphorus and 3 percent potassium, while plain Turf Builder contains 28 percent nitrogen, no phosphorus and 3 percent potassium. The active weed-killing ingredients are 2,4-D and mecoprop. Environmental health agencies in some areas list 2,4-D as a chemical known to cause cancer or birth defects, so use with caution.

Healthy Lawn Chemistry

The Scotts website question-and-answer section states that grass seeds should be allowed to germinate and grow tall and strong enough to be mowed four times before you apply weed and feed. No entirely specific time period is provided, because different grass species grow at different rates, and growth is affected by many variables, including soil quality, temperature and rainfall or manual irrigation.

Before applying any fertilizer or herbicide product, put on a mask, safety goggles, gloves, long sleeves, long pants and closed toe shoes. After applying the weed and feed and cleaning the spreader, wash your clothing in hot water and detergent to remove any dust or residue.

Wait for a calm day when temperatures are not expected to rise above 90 degrees Fahrenheit and no rainfall is expected for at least 24 hours. Water the lawn first to moisten the grass, or start the application when the grass is moist from dew. The product should be applied while weeds are actively growing in the lawn. A second application may be made, but wait at least 30 days — and do not use the product more than twice each year.

“Weed and feed”. By the nature of its wording. the ‘weed’ refers to the mix having a herbicide in its make-up.
You applied a weed killer. then applied grass seed–which the herbicide will kill.
Usually, we kill the weeds, then wait a respectable time before we apply grass seed
I’m afraid, depending on the strength of the herbicide the grass seed will not produce anything.
So, acctept that and plan on re-seeding later.

My question is: The lawn is about 50% soil/bare right now (not bare because of the weed & feed since its only been 2 days since putting down, it is bare because of removing some massive bushed covering half the yard). We did not turn the soil before putting down the Weed & Feed and it did go all over these bare spots as well (which are dry and very hard bare spots). We were planning to bring in fresh soil for these bare spots to grow the seed.
So- if we were to put down, say 2 inches of fresh soil over the entire yard, would the seed then germinate if the seed was in the new soil and not in the old soil with the weed & feed? And what happens when the new roots go down into the spoil with the weed & feed?


I think it is less likely that you get growth and then the young grass dies as the roots go deeper, more likely is you won’t get growth at all or significantly less than you had planned for (say 1/4 or 1/3 germination rate, btw totally just throwing a random number out since I have no idea if anyone could give a good estimation).

I would suggest you keep up with a watering program and I suggest you feed your lawn by putting down a layer (1″) of compost or good cattle manure.
This will feed the bacteria, increase the organic matter to encourage moisture retention.
After seeding, this 1″ layer will feed your lawn for many weeks and encourage strong roots.

POLL: What are you planning to grow this summer?