Guardian Pre-emergent 13-0-10 Fertilizer

Name: Guardian Pre-emergent 13-0-10 Fertilizer
Brand: Lawn Synergy
SKU: 42915755196554
Price: 39.99 USD
Availability: InStock
Rating: 4.7 (82 reviews)

Stop Crabgrass Before It Starts — Or Deal With Weeds All Summer

$39.99

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Stops crabgrass before it starts
Feeds while it protects
Slow-release feeding for lasting color

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

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Select Size 18 lbs. up to 4,500 sqft. 25 lbs. 4,501-7,000 sqft. Most Popular 50 lbs. up to 12,000 sqft. Best Value

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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 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.

When to Apply

Apply February–April before soil temperatures reach 55°F. Reapply 6 weeks later to extend control and continue feeding the lawn.
Warm-Season Lawns: Apply again in September to prevent winter weeds.

Pre-emergent must be applied before soil temperatures reach 55°F for several consecutive days in spring to prevent crabgrass germination. Apply 1st application early!

Dormant lawn? apply Safeguard 0-0-7 Pre-Emergent instead.

Application Instructions

Apply at 4–5 lbs per 1,000 square feet using a broadcast spreader.
Water in with ½ inch of irrigation or rainfall within 7 days to activate the pre-emergent barrier.

Details

Key	Value
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

FAQ

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.