Pennington Full Season W&F+Crab 4M 25-0-8 RF

The Verdict

Let’s be blunt: lawn chemicals are a crowded shelf, and most weed-and-feed combos are mediocre at both jobs. The Pennington Full Season Weed & Feed + Crabgrass Preventer (25-0-8) tries to do three things at once — kill broadleaf weeds, feed your turf, and stop crabgrass for four months. Does it pull it off? Mostly yes, with caveats that matter.

What’s Actually in the Bag

This is a granular product, and the label tells you what you’re paying for. The 25-0-8 NPK means heavy nitrogen (25%) for green-up, zero phosphorus (skip this if you’re near waterways or have high-P soil already), and 8% potassium for root strength. The crabgrass control comes from dithiopyr (Dimension) — a pre-emergent that also catches early crabgrass that’s already germinated. That’s a meaningful difference from straight pre-emergents like dithiopyr-only products; it gives you a small window of post-emergent control.

The “4M” in the name is the promise: up to four months of crabgrass prevention with a single application. That’s legit for dithiopyr at proper rates, but only if you apply before soil temps hit 55°F consistently.

Performance: The Real-World Story

The fertilizer part works. Users consistently report darker, thicker grass within 7–10 days of application when they water it in properly. The nitrogen is slow-release (hence the “RF” — resin-coated), which reduces burn risk compared to quick-release urea products. One reviewer noted, “Lawn greened up fast, no burn spots, and it held color for a solid month.” That tracks with the formulation.

The weed control is solid for dandelions, clover, and chickweed — the label’s target weeds. But it’s not a broad-spectrum herbicide. If you have creeping Charlie, wild violet, or other tough perennials, you’ll need a spot treatment with something like triclopyr. Don’t expect this to fix a mature weed infestation.

The crabgrass prevention is where the mixed reviews come from. When applied at the right time (early spring, before soil temps hit 55°F), it works. The 3.9/5 Amazon rating reflects the reality that many buyers miss that window. One verified purchase complained, “Applied in late May and still got crabgrass by July. Waste of money.” That’s not the product failing — that’s a timing error. The label is clear, but if you’re not monitoring soil temps, you’re gambling.

Where It Falls Short

Watering requirements are non-negotiable. This product must be watered in within 24 hours of application — ideally within a day. If you apply it and get a dry week, you’ve wasted your money. That’s a real drawback for anyone without an irrigation system or who can’t control rainfall timing.

It’s not for new lawns. If you’ve seeded or laid sod in the past few months, skip this. The pre-emergent chemistry will prevent new grass seed from germinating. You need to wait until your new grass has been mowed at least twice. That’s a hard constraint that isn’t obvious to first-time lawn owners.

Coverage confusion. The bag covers 4,000 square feet at the standard rate, but if you’re applying to a densely shaded or heavily weeded lawn, you may need a follow-up application for full season coverage. The “Full Season” name overpromises for high-pressure crabgrass zones.

Who Should Buy This

• The proactive lawn owner who tracks soil temps and can water within 24 hours — you’ll get genuine 4-month crabgrass control.
• The busy homeowner who wants one pass for feeding and broadleaf weed control without juggling multiple products.
• The established lawn owner with existing turf that’s mostly healthy, just needs maintenance.

Skip it if you’re seeding this spring, you’re in the deep South with year-round crabgrass pressure, or you can’t commit to the watering schedule.

FAQ

Q: Can I overseed after using this? A: No — not for at least 3–4 months. The dithiopyr prevents all seed germination, including grass seed. Plan your seeding for fall if you use this in spring.

Q: When exactly should I apply it? A: When forsythia blooms or soil temps hit 55°F (usually early spring). Apply to dry grass, then water in within 24 hours. Don’t wait for “it looks like it’s time” — that’s usually too late for crabgrass prevention.

Q: Is it safe for pets and kids? A: Once watered in and dried, yes. Keep them off until the granules are gone and the lawn is dry — typically 24 hours after watering.

The Verdict

Rating: 3.7/5

Buy it if you’re an established lawn owner who can commit to proper timing and watering. You get solid feeding, decent broadleaf control, and real four-month crabgrass protection in one pass — value that’s hard to beat around $40–50 per bag.

Skip it if you’re seeding, you have heavy perennial weed pressure beyond dandelions and clover, or you can’t guarantee watering within 24 hours. Those constraints will turn this into a wasted application, and you’d be better off with separate pre-emergent and fertilizer products you can time independently.

It’s a good product for the right user — just read the label like it’s a contract, because it is.

Where to Buy

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.