Guardian Pre-emergent 13-0-10 Fertilizer
13-0-10 Guardian pre emergent fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
13-0-10 Guardian pre emergent fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
Guardian Pre-emergent 13-0-10 Fertilizer
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Guardian Pre-emergent 13-0-10 Fertilizer

Stop Crabgrass Before It Starts — Or Deal With Weeds All Summer
  • Stops crabgrass before it starts
  • Feeds while it protects
  • Slow-release feeding for lasting color
$39.99

Apply before soil hits 55°F; repeat in 6 weeks.

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Guardian 13-0-10 is a professional-grade pre-emergent fertilizer designed to do two jobs at once — prevent crabgrass and annual weed seeds from germinating while feeding your lawn for deep green, steady growth. If you want...

Guardian 13-0-10 is a professional-grade pre-emergent fertilizer designed to do two jobs at once — prevent crabgrass and annual weed seeds from germinating while feeding your lawn for deep green, steady growth.

If you want a clean lawn without fighting weeds all summer, this is where you start.

What Guardian Prevents

  • Crabgrass
  • Goosegrass
  • Poa annua (annual bluegrass)
  • Spurge
  • Chickweed
  • Oxalis

Guardian contains .37% Prodiamine, creating a long-lasting soil barrier that prevents weed seeds from germinating.

Why Guardian 13-0-10 Is Different

  • Nitrogen for rich green color — promotes steady top growth without excessive surge.
  • Slow-release nitrogen — feeds gradually for extended performance and improved efficiency.
  • Potassium — strengthens roots and improves drought, heat, and disease tolerance.
  • Professional-grade formulation — built for consistent, even results.
  • Bio-based — enhance soil structure and naturally support long-term lawn health.

The result is a thicker, darker lawn that naturally crowds out weeds.

Ideal For

  • Tall Fescue
  • Kentucky Bluegrass
  • Bermuda
  • Zoysia
  • St. Augustine
  • Centipede

⚠️ Do not apply if you are planning on seeding.  Prodiamine prevents all seeds from germinating, including grass seed for up to 3-4 months.

Active Ingredient .37% Prodiamine
Lawn Types Tall fescue, Bermuda, Zoysia, St. augustine, Centipede, Kentucky bluegrass, Ryegrass
Special Features Prevents weeds and slowly feeds lawn
Application Rate 4-5 lbs. per 1,000 sq. ft. Recommended 2 applications for maximum protection against weed germination
Time to Apply Spring, Fall
Waiting Period to Seed 120 Days
Delivery System Granules
Brand Lawn Synergy
For Use In Turf Grass, Landscape Beds

When should I apply pre-emergent?

Pre-emergent herbicide is best applied before weeds germinate. For cool season lawns, pre-emergent herbicide should be applied before soil temperatures reach 55 degrees consecutively to prevent crabgrass and other weeds.

For warm season lawns, pre-emergent herbicide should be applied in the spring before soil temperatures reach 55 degrees and in the fall, typically in September for season long control

Can I apply it twice?

Yes. A second application 6–8 weeks later helps extend protection.

Will it stop existing weeds?

No. This product prevents weeds before they emerge.

What weeds does it prevent?

Primarily crabgrass and other annual grassy weeds.

I applied pre-emergent too late. Now what?

Unfortunately pre-emergents must be applied before weeds germinate. It is very important to apply pre-emergent early before soil temperatures warm up or before coming into the season. You will see additional weed pressure during the growing months that will need to be attended to.

How long do I need to wait until I can seed?

We recommend waiting at least 3-4 months before seeding can take place. Spot seeding can be done if the soil is agitated and or replaced with new soil.

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