Prodiamine is the longest-lasting pre-emergent herbicide available, providing up to 6 months of crabgrass prevention from a single application. Sold under the brand name Barricade, it is the professional standard for pre-emergent weed control in warm and cool-season turf.
Crabgrass (primary), goosegrass, foxtail, annual bluegrass (Poa annua), spurge, oxalis, chickweed, henbit, purslane, annual sedge, and 30+ other annual grasses and broadleaf weeds. Does NOT control established perennial weeds. Does NOT control nutsedge.
Barricade 65 WDG (Syngenta - professional granule, mix in water), The Andersons Barricade (granular with fertilizer for homeowners), Quali-Pro Prodiamine 65 WDG (generic professional), Lesco Stonewall. Yellow-tinted granules are a visual indicator of where you have applied.
Low toxicity to mammals and birds. Practically non-toxic to bees and aquatic organisms at labeled rates. The yellow staining of granules can temporarily discolor concrete and light-colored surfaces - avoid application on driveways and sidewalks, or water in immediately.
Why professionals choose Barricade: Prodiamine has the longest residual activity of any pre-emergent herbicide - up to 6 months at the high labeled rate. This means a single spring application can provide crabgrass prevention through the entire summer in most regions.
Split application strategy: For maximum season-long control, apply at half rate in early spring (when forsythia blooms) and half rate again 8-10 weeks later. This extends the barrier through late-season crabgrass germination that a single application might miss.
Rate matters: Prodiamine labeled rates range from 0.5 to 1.5 lbs active ingredient per acre depending on target weed and desired duration. Higher rates provide longer residual but also delay any reseeding window. At the low rate, you can overseed 8 weeks after application. At the high rate, wait 12+ weeks.
Do NOT overseed after application: Prodiamine prevents ALL seed germination - including grass seed. If you need to overseed or reseed bare areas, either skip the pre-emergent in those areas or wait the appropriate interval (see label for your rate). This is the most common pre-emergent mistake homeowners make. See our complete pre-emergent timing guide.