Guardian 13-0-10 Pre-Emergent Fertilizer
Important: Do not apply if installing grass seed.
Product Description
Prevent Weeds While Feeding Your Lawn
Guardian 13-0-10 is a professional-grade pre-emergent fertilizer that prevents crabgrass and annual weeds from germinating while feeding your lawn for steady growth and deep green color.
For a cleaner lawn without fighting weeds all summer, Guardian is where you start.
What Guardian Prevents
- Crabgrass
- Goosegrass
- Poa annua (annual bluegrass)
- Spurge
- Chickweed
- Oxalis
Guardian contains 0.37% prodiamine, which creates a long-lasting barrier in the soil that prevents weed seeds from germinating.
Why Choose Guardian 13-0-10?
- Steady green growth: Nitrogen promotes rich color without excessive growth.
- Extended feeding: Slow-release nitrogen delivers nutrients gradually for lasting performance.
- Stronger roots: Potassium helps improve heat, drought, and stress tolerance.
- Professional-grade results: Designed for even coverage and dependable performance.
- Bio-based ingredients: Help support soil structure and long-term lawn health.
The result is a thicker, darker lawn with fewer weeds.
Safe for These Lawn Types
Tall fescue, Kentucky bluegrass, Bermuda, zoysia, St. Augustine, and centipede.
Important Seeding Warning
Do not apply Guardian if you plan to seed or overseed. Prodiamine prevents all seeds from germinating, including grass seed. Wait at least 3–4 months after application before planting grass seed.
Product resources
Product Information & Resources
Everything you need to understand, apply, and reference this product.
Details & Specifications
| Active Ingredient | .37% Prodiamine |
|---|---|
| Lawn Types | Centipede, St. augustine, Zoysia, Bermuda, Tall fescue, Northern cool-season |
| Special Features | Prevents weeds and slowly feeds lawn |
| Application Rate | |
| Time to Apply | Spring, Fall |
| Waiting Period to Seed | 120 Days |
| Delivery System | Granules |
| For Use In | Turf Grass, Landscape Beds |
| Brand | Lawn Synergy |
Spreader Settings
Documents & Labels
Frequently Asked Questions
When should I apply pre-emergent?
Can I apply it twice?
Will it stop existing weeds?
What weeds does it prevent?
I applied pre-emergent too late. Now what?
How long do I need to wait until I can seed?
Customer Reviews
Overall rating: 4.580645 / 5 from 155 reviews.
AI Generated Review Summary
Guardian Pre-emergent 13-0-10 Fertilizer offers a balanced nutrient mix for lush, green lawns while effectively preventing weed germination. Its slow-release nitrogen ensures long-lasting green color and improved stress tolerance. Easy application and compatibility with various grass types make it a popular choice for maintaining a healthy, weed-free lawn.
Summary topics
- Lawn Appearance (15%): A significant number of customers remarked that the lawn looked great and the lawn has greened up beautifully.
- Grass Greening (10%): Customers expressed appreciation for the noticeable effects achieved with the grass being greened up nicely in a week.
- Customer Service (15%): Many customers brought up the excellent service provided by Lawn Synergy, which was mentioned multiple times in the reviews.
- Lawn Aesthetics (8%): Customers expressed satisfaction with the look of their lawns, describing it as amazing and better than the local golf course.
Review topics: [].
Review highlights
- "With the exception of removing about two dozen overall the lawn looks very well." —
- "Very easy and quick shipping and delivery." —
- "Grass is looking great!" —
Reviews
I just put it down
"I just put it down today. Not sure how long it takes to work! On the downside l received a generic bag from you. Nothing on that says Lawn Synergy. Definitely not a Lawn Synergy bag. How do I know that this 13-0-10, even though the generic plastic bag says it is 13-0-10. Disappointing to say the least. It's probably the real stuff but l will not purchase any more product unless it comes in a Lawn Synergy bag."
I'll let you know in
"I'll let you know in the spring. My zoysia is starting to go dormant already but I haven't had any more weeds since putting this down"
"Is to early to put down pre emerging in Georgia on burmudagrass ? I was told that you should do two applications one the fall and one in spring"
Seems to do well with
"Seems to do well with the weeds but did not green up like I was expecting."
Made a difference
"This is only my second round of fertilizer and I can see the difference in the thickness of the grass. So far so good. Thank you"
Good Stuff
"Set the tone for next year."
Very happy with my applications
"Very happy with my applications of 13-0-10. My lawn is pretty much weed free and super thick and green. I have received numerous compliments and questions as to what I'm doing to get my lawn looking so good. I was happy to pass on the name of your company and amazing products. Thank you!"
Using Lawn Synergy’s subscription service,
"Using Lawn Synergy’s subscription service, I have applied two applications of Guardian thus far and have had spectacular results! Golf course looking lawn with deep green color. I also used their spot weed product Q4 Plus Turf Herbicide periodically and the lawn is almost weed free! Watering regularly and mowing using the highest setting. Summers in NC are tough on tall fescue, so that will be the true test! Highly recommend!"
Great looking lawn
"I've cut my front lawn 4 times already and it's due for mowing again tomorrow. This is my second year on the program and I'm very happy with the results. I sent in a soil sample and the fertilizers Tony has recommended have given me a lawn with strong, green blades of grass. ."
Good stuff. I have to
"Good stuff. I have to leave a portion on my yard untreated because we have bees, so I use that as a control. But it also tends to spread out, so far the damage has been well managed because of this stuff. And my grass is noticeably darker and thicker. Second application is coming up pretty excited"
Q&A
- How soon will I observe the weeds dying, and when can I expect the grass to regain its vibrant green color?
- I applied13-0-10 pre-emergent in mid February to hopefully stop weeds from coming up. The second application in mid-April will hopefully **** the weeds that managed to escape the first application.
- Hi, does 13-0-10 Guardian Pre-emergent Fertilizer need to immediately be watered in, what's recommended?
- It is best to go ahead and water it in, and make sure that you avoid laying it down right before a heavy rain.
- Hi, does 13-0-10 Guardian Pre-emergent Fertilizer need to immediately be watered in, what's recommended?
- Yes
- Hi, does 13-0-10 Guardian Pre-emergent Fertilizer need to immediately be watered in, what’s recommended?
- Yes, I did water it in, but I don’t think it was necessary. There was heavy dew in the morning after I applied it, and it dissolved within a few days.
- Is this safe for animals after use of this product?
- I don't have any animals therefore I don't know if this product is safe for animals.