Starter Fertilizer 15-20-10 +Iron

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Starter Fertilizer 15-20-10 +Iron

Name: Starter Fertilizer 15-20-10 +Iron
Brand: Lawn Synergy
SKU: 42915759915146
Price: 39.99 USD
Availability: InStock
Rating: 4.88 (69 reviews)

Starter Fertilizer 15-20-10 +Iron

Helps new grass establish strong roots fast

$39.99

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Select Size 18 lbs. up to 3,600 sqft.. 25 lbs. 4,000-7,000 sqft. 50 lbs. up to 12,500 sqft.

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Lawn Synergy's 15-20-10 Starter Fertilizer isn’t just good—it’s the best you can buy for new seed, sod, or overseeding. Engineered with pro-grade ingredients and exclusive bio-technology, it gives your lawn everything it needs to root deep, grow fast, and explode with color—starting from day one.

Why It Works So Well

15-20-10 Nutrient Ratio: The perfect balance of nitrogen, phosphorus, and potassium for rapid seed germination, deep root development, and thick turf establishment.
50% XCU Slow-release: Don’t let your nitrogen go to waste. XCU coated nitrogen continues to feed your lawn for 8-10 weeks, so your lawn absorbs more, stays greener longer, and grows stronger faster.
NuTrace Technology: Micro-nutrients are sprayed on every pearl maximizing even distribution within the lawn.
Iron + Ammoniacal Nitrogen: Supercharge your lawn with a deep, dark green color that homeowners and pros chase all season long.
Humic Acid & Soil Amendments: We packed in rich humic acid, and Phast-cal to energize your soil microbes, buffer pH, and create a living soil that thrives from the roots up.

Only From Lawn Synergy

This fertilizer is not sold in big box stores—you can only get it here. It’s the same premium-grade formula used by pros on elite properties, now available to you for your home lawn.

Choose Your Size

18 lb: Perfect for small yards or targeted seeding
25 lb: Best for average-sized lawns
50 lb: Maximum value for full-lawn coverage or big jobs

Results You Can Expect

Faster germination and establishment
Stronger, deeper roots
Rich, dark green color in days
Resilient turf that resists drought and disease

Don’t settle for average—go with the starter fertilizer that delivers real results. Order Lawn Synergy 15-20-10 Starter today and give your lawn the head start it deserves.

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.