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Grass Seed and Fertilizer Combination

By Charles Pearson ; Updated September 21, 2017
Plants grow healthy when they receive adequate nutrients.
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One way for property owners to establish their lawns is by spraying the seeds onto the ground so that the seeds can germinate, as opposed to laying sod on the lawn. To create an environment that is ideal for the grass, many manufacturers who produce grass seed combine this product with fertilizer, ensuring that the plants have early-on access to necessary nutrients.


Grass seed comes in many varieties, such as fescue, ryegrass and Kentucky bluegrass. In the seed packages, these grasses are combined in different mixtures so you can have the benefits of the different grass varieties. You should choose the grass seed appropriate for the area you live in.


Since people normally apply their grass seed immediately after applying fertilizer, the combination of seed and fertilizer in one package does not have a negative effect on the grass. However, you should not apply grass seed along with weed-and-feed fertilizer, because this product contains herbicides containing preemergence hormones that inhibit a seed's ability to germinate.


After spraying the seed and fertilizer combination, you should not put straw mulch over the seeds. While the mulch helps insulate the grass from cold weather, the straw often contains weed seeds that can germinate alongside the grass, preventing the grass from growing when the weeds sap the ground of nutrients. You can use straw mulch on already established lawns, since these lawns will be strong enough to out-compete the weeds.

Time Frame

The best times to seed the lawn are in spring and fall. Winter and summer have more extreme weather conditions that can kill many of the germinating seeds, forcing you to reseed certain areas.


After applying the seed and fertilizer products, you often must water the ground for a long period of time to help the seeds germinate and develop very deep roots. This will make the grass lush and resistant to weeds and other stresses.


About the Author


Charles Pearson has written as a freelancer since 2009. He has a B.S. in literature from Purdue University Calumet and is currently working on his M.A. He has written the ebooks "Karate You Can Teach Your Kids," "Macadamia Growing Handout" and "The Raw Food Diet."