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Don’t Just Plant Seed—Give It What It Needs to Grow
When you plant new grass, the biggest challenge isn’t just getting it to sprout—it’s getting it to establish strong roots.
Starter fertilizer is designed specifically for new seed or sod, with higher phosphorus to help roots develop quickly and absorb nutrients more efficiently.
Without it, your lawn may come in thinner, slower, and less resilient.
Lawn Synergy 15-20-10 Starter Fertilizer is specifically formulated to support early root development, uniform establishment, and steady growth during the critical first weeks after seeding or sodding.
This balanced nutrient profile supports young turf when root development matters most.
Without Starter Fertilizer, New grass struggles to develop strong roots early on.
That can lead to:
Starter fertilizer gives new grass exactly what it needs during the most important stage of growth.
Use at the Time of Seeding or Overseeding
Starter fertilizer is most effective when applied at the time of planting, helping seeds establish faster and stronger.
Lawn Synergy 15-20-10 provides the structured, professional nutrition your lawn needs during establishment — when root development determines long-term success.
| Key | Value |
|---|---|
| Active Ingredient | 15% Nitrogen - 20% Phosphorus - 10% Potassium |
| Lawn Types | Tall fescue, Bermuda, Zoysia, Kentucky bluegrass, St. augustine, Ryegrass, Centipede |
| Special Features | Contains 50%XCU Nitrogen, NuTrace Technology, Humic Acid, and pH soil buffers, which is a great starter fertilizer for grass seed. |
| Application Rate | 4-5 lbs. per 1,000 sq. ft. |
| Time to Apply | Spring, Summer, Fall, Winter |
| Waiting Period to Seed | None |
| Delivery System | Granules |
| Brand | Lawn Synergy |
| For Use In | Turf Grass |
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Choose OptionsOverall rating: 4.895349 / 5 from 86 reviews.
Lawn Synergy's 15-20-10 Starter Fertilizer helps new lawns establish quickly with strong roots and vibrant color. Customers report fast germination, improved lawn appearance, and satisfaction with the product's results and shipping.
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"Excellent seeds! Love the results. Ever been this good even for small patches. I used the seed for a large area, ~3000 sf, and couldn’t be any happier with results. My prep work did not go to waste. I have a green lawn now!!! Synergy i will vist more based on this result. 👍👍"
"Completely reseeded lawn with lasko fescue seed and starter fertilizer 👍 last year September 2025 this is this year in April 2026"
"I am well pleased with the Starter Fertilizer 15-20-10 +Iron. My fescue is taking off and the older grass is turning green even with the drought. However I do water the grass daily."
"Have to wait till fall my lawn company put pre emergent down. So I'm looking to enrich the soil"
"Excellent product"
"On-time"
"Lawn Synergy products are the absolute best! From the fertilizers to the grass seeds, our lawn looks healthy and wealthy! We made the switch to using your products earlier this summer and after seeing the results for the past several months I can say we will only be using Lawn Synergy from now on. Your products definitely have our attention and the attention of our neighbors! While working in the yard throughout the summer, we’ve had several neighbors comment on how great our lawn looks and we were even told “we had the best yard in the neighborhood”. Thank you Lawn Synergy for the amazing products that are producing eye catching results!"
"This product here helped the Come in quickly, I had grass growing in four days"
"I used this as directed after detaching, triple core ariation, and slit-seeding with Synergy Envy. I had germination and new grass at the 1 inch mark on the 7th day with a deep green color. I live in Central Illinois and we are under drought conditions with very high temps in late September and early October. I did apply a small layer of peat moss over my entire yard to help keep the seed moist with the heat we had fueling and after planting. I did water 3 times per day with an irrigation system. Completely happy with the seed and the starter fertilizer. I highly recommend!"
"Really really good stuff. Paired with the North Star seednI have germination in 6 days"
