The Ultimate Guide to Prodiamine: Your Go-To Crabgrass Preventer for a Weed-Free Lawn
If you’ve ever battled crabgrass invading your beautiful lawn each summer, you know how frustrating it can be. Once crabgrass germinates and takes hold, it’s tough to eradicate without selective post-emergent herbicides and a lot of effort. The secret to winning the war against crabgrass? Prevention—specifically, using a powerful pre-emergent herbicide like prodiamine.
Prodiamine (often sold under brand names like Barricade or as generics) is one of the most popular and effective pre-emergent options for homeowners and pros alike. In this blog post, we’ll cover what prodiamine is, how it works, why it’s great for crabgrass control, application tips, safety considerations, and more.
What Is Prodiamine and How Does It Work?
Prodiamine is a selective pre-emergent herbicide from the dinitroaniline family. It prevents weed seeds from germinating by inhibiting cell division in the roots and shoots of emerging plants. Essentially, it creates a “barrier” in the soil that stops weeds before they can sprout and establish.
It’s particularly renowned for controlling crabgrass (one of the most common and aggressive summer annual grasses), along with other weeds like:
- Poa annua (annual bluegrass)
- Goosegrass
- Chickweed
- Henbit
- Bittercress
- Spurge
- And many other annual grassy and broadleaf weeds
Prodiamine does not kill existing weeds—it’s strictly pre-emergent. If crabgrass is already growing, you’ll need a different approach (like post-emergent products or manual removal).
Common products include:
- Granular formulations (e.g., Lebanon Prodiamine 0.58G, Yard Mastery 0-0-7 Prodiamine)
- Wettable dispersible granule (WDG) like Prodiamine 65 WDG (generic Barricade)
These are widely available at stores like Home Depot, Lowe’s, Tractor Supply, Amazon, or specialty lawn care sites.
Benefits of Using Prodiamine for Crabgrass Prevention
- Long-lasting control — A single application (or split apps) can provide 3–6+ months of protection, often covering the entire crabgrass germination window.
- Broad-spectrum — Controls dozens of weeds, not just crabgrass.
- Safe for established turf — Works on most cool-season (e.g., Kentucky bluegrass, fescue, ryegrass) and warm-season grasses (e.g., Bermuda, Zoysia, St. Augustine), except very young seedlings or putting greens.
- Cost-effective — Especially generics, offering professional-grade results at DIY prices.
- Low volatility — Stays where applied and breaks down relatively quickly in sunlight/water.
Compared to alternatives like dithiopyr (Dimension), prodiamine often provides longer residual control and is less mobile in soil (great in rainy areas), though both are excellent crabgrass preventers.
When to Apply Prodiamine: Timing Is Everything
Timing is critical for pre-emergents. Apply before weed seeds germinate, when soil temperatures hit around 50–55°F (10–13°C) for 2–3 consecutive days—typically late winter to early spring in most regions.
- Monitor soil temps (use tools like Greencast Online for local data).
- In northern areas (like Massachusetts), aim for March–April.
- In warmer southern climates, it could be February or earlier.
- A popular strategy is the “split application”:
- First app: Early spring (~55°F soil) at a lower rate (e.g., 0.183–0.5 oz per 1,000 sq ft for Prodiamine 65 WDG).
- Second app: Mid-spring (~65–70°F soil) to extend protection.
- Fall application can target Poa annua and winter weeds.
Water in with at least 0.5 inches of irrigation or rain within 24–48 hours (up to 14 days max) to activate it into the soil.
How to Apply Prodiamine
- Calculate your lawn size and product rate (follow the label!).
- Granular: Spread evenly with a broadcast spreader.
- Liquid (WDG): Mix in water (e.g., 1 gallon per 1,000 sq ft) and spray with a pump sprayer.
- Apply uniformly — Overlap slightly to avoid skips.
- Water in promptly.
- Avoid applying to newly seeded lawns (wait 60+ days after germination) or if planning to overseed soon—it will prevent grass seed from sprouting too.
Always read the full product label for your specific formulation, rates, and restrictions.
Safety and Environmental Considerations
Prodiamine is low in toxicity to humans and bees when used as directed. It’s classified as “possibly carcinogenic” by the EPA (Group C, based on animal studies), but risks are minimal with proper PPE (gloves, long sleeves, avoid inhalation).
- Harmful if inhaled or absorbed through skin—wear protection.
- May cause skin sensitization in some people.
- Toxic to aquatic life—avoid runoff into water bodies.
- Low risk to earthworms and beneficial insects.
Keep pets and kids off treated areas until dry, and follow label instructions.
Final Thoughts: Is Prodiamine Right for Your Lawn?
If crabgrass has been a recurring nightmare, prodiamine is often the gold standard for prevention. Many lawn enthusiasts report near-perfect crabgrass-free summers after proper application. Pair it with good cultural practices—mowing high, proper watering, fertilization, and aeration—for the best results.
Ready to say goodbye to crabgrass? Grab some prodiamine this season, time it right, and enjoy a thicker, greener, weed-free lawn.
Need help, request a quote and we can keep your lawn crabgrass free this year!