Starter Fertilizer 15-20-10
Give new grass the nutrients it needs to establish quickly and develop strong roots from the start.
$39.99
Product Description
New grass needs more than water and sunlight. It also needs the right nutrients to develop deep roots, establish quickly, and grow into a thick, healthy lawn.
Lawn Synergy 15-20-10 Starter Fertilizer is formulated specifically for new seed, overseeding, and sod. Its high-phosphorus formula promotes early root development, while controlled-release nitrogen, iron, and micronutrients provide balanced nutrition during the critical establishment period.
👉 Stronger roots. Faster establishment. Professional-grade nutrition from day one.
Why Choose Lawn Synergy Starter Fertilizer?
- 15-20-10 starter formula: High phosphorus promotes strong early root development.
- Controlled-release nitrogen: Provides steady feeding during establishment.
- Iron & micronutrients: Support healthy color and vigorous growth.
- Designed for new seed, overseeding, and sod.
Application Rate
- 4–5 lbs per 1,000 sq. ft.
- Apply at the time of seeding, overseeding, or sod installation.
- Water in after application.
Perfect For
- New lawn installations
- Overseeding existing lawns
- New sod installations
- Repairing bare or thin areas
When to Apply
Apply at the same time you spread seed or install sod so nutrients are available as new roots begin to develop. Starter fertilizer is intended for use during establishment—not routine maintenance fertilization.
COMMON QUESTIONS
Frequently Asked Questions
Product resources
Product Information & Resources
Everything you need to understand, apply, and reference this product.
Details & Specifications
| 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 | |
| Time to Apply | Spring, Summer, Fall, Winter |
| Waiting Period to Seed | None |
| Delivery System | Granules |
| For Use In | Turf Grass |
| Brand | Lawn Synergy |
Spreader Settings
Documents & Labels
Customer Reviews
Overall rating: 4.8863635 / 5 from 88 reviews.
AI Generated Review Summary
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.
Summary topics
- Lawn Establishment: 18%
- Product Results: 10%
- Lawn Appearance: 7%
- Shipping Speed: 10%
Review topics: [].
Review highlights
- "From the fertilizers to the grass seeds, our lawn looks healthy and wealthy!" —
- "Fast delivery; great results!" —
- "I am very happy with my purchase my lawn is looking beautiful." —
Reviews
Excellent seeds! Love the results.
"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. 👍👍"
It hasn't really helped the
"It hasn't really helped the Bermuda seed I purchased from your team. But this is the time of the year the Bermuda seed should start kicking in."
Completely reseeded lawn with lasko
"Completely reseeded lawn with lasko fescue seed and starter fertilizer 👍 last year September 2025 this is this year in April 2026"
"Great product grass looks amazing super green!"
Starter Fertilizer review
"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
"Have to wait till fall my lawn company put pre emergent down. So I'm looking to enrich the soil"
Excellent product
"Excellent product"
"On-time"
Lawn Synergy products are the
"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!"
Great for new installationL
"This product here helped the Come in quickly, I had grass growing in four days"
Q&A
- When do I reapply? I love the results already. I have St Augustine grass in east Texas
- You can reapply in 5-6 weeks. If your area, you can apply emerald 10-0-20 next.
- When do I reapply? I love the results already. I have St Augustine grass in east Texas
- Suggest applying fertilizer again in 6 weeks.
- I have a new sod lawn in North TX. I was going to apply this. Is now a good time? The law is established now and about two months old most areas and over a month old in others. I wanted to fertilize to help it grow its roots.
- Yes, this would be a great choice for new sod or new seed.
- Hello, As a DYI person, can this be applied to existing lawn ? I have Kentucky Bluegrass,my area is in Illinois . Thanks l
- I have Bermuda, but it worked well for me
- Can you add this the hole before you put in grass plug? If so, how much?
- Yes at 5lbs per 1,000 sqft would be ideal.