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St. Augustine grass pre-emergent · prices checked 1 hour ago

The cheapest pre-emergent for St. Augustine grass

A pre-emergent stops weed seeds such as crabgrass from sprouting. Every product below lists St. Augustine as safe on its label, and is ranked by what it costs to cover 1,000 sq ft at the St. Augustine label rate, from today's verified store prices.

Cheapest right now

$0.44per 1,000 sq ft

Prodiamine 65 WDG, 5 lb for $64.27 at Solutions Pest & Lawn. Spray, mix with water. One full-rate pass on 5,000 sq ft uses $2.21 of it.[1]

The ranking

One full-rate pass on 5,000 sq ft of St. Augustine

At the highest single application each label allows on St. Augustine. For prodiamine that is the whole year's amount, which you can also split into two passes.

  1. Prodiamine 65 WDG$2.21per pass

    Spray, mix with water · up to 0.55 oz per 1,000 sq ft · 5 lb at Solutions Pest & Lawn

  2. Pendulum AquaCap$3.30per pass

    Spray, mix with water · up to 1.6 fl oz per 1,000 sq ft · 2.5 gal at Solutions Pest & Lawn

  3. Dimension 2EW$7.86per pass

    Spray, mix with water · up to 0.73 fl oz per 1,000 sq ft · 64 fl oz at Seed World

  4. Pendulum 2G$23.93per pass

    Granular, spreader · up to 2.3 lb per 1,000 sq ft · 40 lb at Solutions Pest & Lawn

  5. LESCO Dimension 19-0-6$29.41per pass

    Granular, spreader · up to 3.82 lb per 1,000 sq ft · 50 lb at Growcycle

  6. LESCO Stonewall 0-0-7$65.09per pass

    Granular, spreader · up to 9.3 lb per 1,000 sq ft · 50 lb at Growcycle

Specific to St. Augustine

What the labels and the extension say for your grass

  • Labeled for St. Augustine: Prodiamine 65 WDG, LESCO Stonewall 0-0-7, LESCO Dimension 19-0-6, Pendulum 2G, Dimension 2EW, Pendulum AquaCap.[1][2][3][4][5][6]
  • Prodiamine 65 WDG has a St. Augustine starting rate: 0.28 to 0.55 oz per 1,000 sq ft per application, inside the same yearly maximum as other warm-season grasses. The ranking above uses 0.55 oz.[1]
  • Timing: University of Missouri Extension times crabgrass pre-emergent to the soil reaching 55 F at a 2-inch depth, or to forsythia coming into bloom.[7] Check your soil temperature.

First time?

The easy pick for St. Augustine: Pendulum 2G

It goes through a broadcast spreader, so there is no sprayer to buy or calibrate. It is the cheapest granular labeled for St. Augustine today.[4]

Per 1,000 sq ft
$4.79
Smallest checkout
$55.70

20 lb at Seed World.

Every option

Pre-emergents labeled for St. Augustine

Sorted by cost per 1,000 sq ft at the St. Augustine label rate.

Lowest cost per 1,000 sq ft · Spray, mix with water

Prodiamine 65 WDG

Prodiamine 65%, a powder you mix into water and spray

  • Label rate: up to 0.55 oz per 1,000 sq ft per year, the label's yearly maximum for the grass, in one pass or split[1]
  • Spray it: the label calls for at least 0.5 gallon of water per 1,000 sq ft, so you need a pump or backpack sprayer.
  • Needs at least 0.5 inch of rain or irrigation within 14 days to start working.
  • Do not seed for 4 to 12 months after applying (longer at higher rates); the label has the table.
Per 1,000 sq ft
$0.44
One pass, 5,000 sq ft
$2.21
Best value size
5 lb for $64.27 at Solutions Pest & Lawn, treats about 145,455 sq ft per pass
$64.27 at Solutions Pest & Lawn

Spray, mix with water

Pendulum AquaCap

Pendimethalin 38.7% liquid

  • Label rate: up to 1.6 fl oz per 1,000 sq ft per application[6]
  • Spray it, then water in with 1/2 inch of rain or irrigation within 30 days.
  • Do not seed for 3 months after applying.
Per 1,000 sq ft
$0.66
One pass, 5,000 sq ft
$3.30
Best value size
2.5 gal for $132.12 at Solutions Pest & Lawn, treats about 200,000 sq ft per pass
$132.12 at Solutions Pest & Lawn

Spray, mix with water

Dimension 2EW

Dithiopyr 24% liquid

  • Label rate: up to 0.73 fl oz per 1,000 sq ft per application[5]
  • Spray it in 1 to 2 gallons of water per 1,000 sq ft.
  • Needs 0.5 inch of rain or irrigation to activate.
  • Do not seed for 3 months after one application (4 months after split programs above 0.73 fl oz).
Per 1,000 sq ft
$1.57
One pass, 5,000 sq ft
$7.86
Best value size
64 fl oz for $137.77 at Seed World, treats about 87,671 sq ft per pass
$137.77 at Seed World

Granular, spreader

Pendulum 2G

Pendimethalin 2.0% granule

  • Label rate: up to 2.3 lb per 1,000 sq ft per application (the label's 100 lb per acre)[4]
  • Goes through a broadcast spreader.
  • Needs about 1/2 inch of rain or irrigation; the label warns control may be erratic if it is not activated within 30 days.
  • Do not seed for 3 months after applying (5 months before sprigging).
Per 1,000 sq ft
$4.79
One pass, 5,000 sq ft
$23.93
Best value size
40 lb for $83.24 at Solutions Pest & Lawn, treats about 17,391 sq ft per pass
Smallest checkout
20 lb for $55.70 at Seed World
$83.24 at Solutions Pest & Lawn

Granular, spreader

LESCO Dimension 19-0-6

Dithiopyr 0.15% on a 19-0-6 fertilizer granule

  • Label rate: up to 3.82 lb per 1,000 sq ft per application, up to 3 applications a year[3]
  • Goes through a broadcast spreader, and feeds the lawn at the same time: 3.82 lb holds about 0.7 lb of nitrogen, so count it toward the year's fertilizer.
  • Do not seed for 12 weeks after applying (8 weeks for a fall perennial ryegrass overseed).
Per 1,000 sq ft
$5.88
One pass, 5,000 sq ft
$29.41
Best value size
50 lb for $76.99 at Growcycle, treats about 13,089 sq ft per pass
$76.99 at Growcycle

Granular, spreader

LESCO Stonewall 0-0-7

Prodiamine 0.37% on a potash (0-0-7) granule, no nitrogen

  • Label rate: up to 9.3 lb per 1,000 sq ft per year, the label's yearly maximum for the grass, in one pass or split[2]
  • Goes through a regular broadcast spreader. No sprayer, no mixing.
  • Needs at least 0.5 inch of rain or irrigation within 14 days.
  • Do not seed for 4 to 12 months after applying, depending on the rate.
Per 1,000 sq ft
$13.02
One pass, 5,000 sq ft
$65.09
Best value size
50 lb for $69.99 at Growcycle, treats about 5,376 sq ft per pass
$69.99 at GrowcycleWalmart: $82.99

Also for your lawn

Feeding St. Augustine for less

Cheapest fertilizer for St. Augustine grass →Every prodiamine price →

Other grasses

Pre-emergent for another grass

Questions people ask

Straight answers

What is the cheapest pre-emergent for St. Augustine?

Per 1,000 sq ft at the St. Augustine label rate, Prodiamine 65 WDG: $0.44 per 1,000 sq ft, buying 5 lb for $64.27 at Solutions Pest & Lawn (checked 10/17/2026). It is sprayed, so you also need a sprayer. The cheapest granular is Pendulum 2G at $4.79.

Is prodiamine safe for St. Augustine?

Yes. St. Augustine grass is listed as tolerant on the Prodiamine 65 WDG and LESCO Stonewall labels. The yearly maximum is 0.55 oz of 65 WDG per 1,000 sq ft on St. Augustine, with a starting rate of 0.28 to 0.55 oz per application.

When should I put pre-emergent down on St. Augustine?

Before crabgrass seeds germinate, which the prodiamine label requires. University of Missouri Extension times it to the soil reaching 55 F at a 2-inch depth, or to forsythia coming into bloom. Then water it in.

Can I seed St. Augustine after a pre-emergent?

Only after the label's waiting period: 3 months for Pendulum 2G, Pendulum AquaCap, and Dimension 2EW, 12 weeks for LESCO Dimension 19-0-6 (8 weeks for a fall perennial ryegrass overseed), and 4 to 12 months for prodiamine depending on the rate.

Sources

Where every rate and timing comes from

  1. [1]Prodiamine 65 WDG label, EPA Reg. No. 53883-429 (PDF), U.S. EPA Pesticide Product Label System
  2. [2]LESCO Stonewall 0.37% + 0-0-7 label, EPA Reg. No. 10404-114 (PDF), U.S. EPA Pesticide Product Label System
  3. [3]LESCO Dimension 0.15% + 19-0-6 label, EPA Reg. No. 10404-86 (PDF), U.S. EPA Pesticide Product Label System
  4. [4]Pendulum 2G label, EPA Reg. No. 241-375 (PDF), U.S. EPA Pesticide Product Label System
  5. [5]Dimension 2EW label, EPA Reg. No. 62719-542 (PDF), U.S. EPA Pesticide Product Label System
  6. [6]Pendulum AquaCap label, EPA Reg. No. 241-416 (PDF), U.S. EPA Pesticide Product Label System
  7. [7]Patience is lawn owner's friend in March, University of Missouri Extension
  8. [8]HGIC 1218, St. Augustinegrass Yearly Maintenance Program, Clemson Cooperative Extension

Prices come from the Lawn Dominator price feed, which checks retailer listings automatically and publishes only prices that pass its verification audit. Labels are the law: if anything here disagrees with the label on the product you buy, follow the label.

As an Amazon Associate I earn from qualifying purchases. Store buttons are paid links. Prices are collected automatically and can lag retailer changes; always confirm the price, size, and shipping at checkout. Product prices and availability are accurate as of October 17, 2026 at 2:25 PM CDT and are subject to change. Any price and availability information displayed on Amazon.com at the time of purchase will apply to the purchase of the product.

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