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.
Not All Starter Fertilizers Are the Same
15-20-10 Formula - High phosphorus for faster root development
Slow-Release Nitrogen - Feeds longer for continuous growth.
Micronutrients - Darker green color with iron and needed nutrients.
This balanced nutrient profile supports young turf when root development matters most.
Why Starter Fertilizer Matters
Without Starter Fertilizer, New grass struggles to develop strong roots early on.
That can lead to:
Thin, patchy growth
Slower germination
Weak turf that doesn't fill in propertly
Starter fertilizer gives new grass exactly what it needs during the most important stage of growth.
When to Apply
Use at the Time of Seeding or Overseeding
New Lawn installations
Overseeding thin or patchy areas
Sod installation
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.
Details
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
Frequently Asked
What is starter fertilizer?
Starter fertilizer is a higher dose of essential nutrients needed when trying to establish new grass seed or when installing sod. It contains Nitrogen, Phosphorus, and Potassium which all three macronutrients are needed for best results.
When to apply starter fertilizer?
Starter Fertilizer should be applied at time of installing new sod or grass seed. As the fertilizer breaks down and begins to work, it is perfect timing for the new grass to begin taking in essential nutrients.
Should I apply starter fertilizer when seeding or wait until it germinates?
We highly recommend applying starter fertilizer at the time of seeding. .
Can I use starter fertilizer to aid in correcting phosphorus and potassium deficiencies?
Absolutely. Starter fertilizer contains both a healthy dose of both potassium and phosphorus which will aid in correcting deficiencies.
When to put down starter fertilizer after overseeding?
We recommend applying starter fertilizer at the same time of aeration and overseeing. Core aeration is always best and it will also help move phosphorus down into the soil layer.