Roundup ProMAX 1.67 Gallon Herbicide Concentrate - Fast Rain Fast

In this review the Roundup ProMAX 1.67 Gallon concentrate is evaluated for homeowners, landscapers, and grounds crews who need a reliable post-emergence herbicide. The bottom line: this product is best for users who want quick, broadleaf and tough-weed control with a 30-minute rain fast window and deep systemic action that moves to roots. Our review finds it especially useful for trim and edge work, turf renovation, and clearing brush where fast knockdown and minimal regrowth are priorities.

Key Features

• Concentrated formula: The 1.67 gallon size contains a high concentration suitable for multiple large-area treatments without frequent repurchasing.
• Post-emergence control: Designed to target broadleaf weeds after they emerge, providing visible die-back and long-term suppression.
• Systemic action: Penetrates leaves and moves to roots so treated weeds are killed through their root system, reducing regrowth.
• 30-minute rain fast: Rapid leaf penetration means applications can withstand light rain shortly after treatment, increasing reliability in variable weather.
• Versatile use: Works for trim and edge applications, turf renovation, weed control in shrub beds, and removing brush and vines where contact is allowed.

Who It's For

This product suits property owners and professional landscapers who need a strong, systemic herbicide for broadleaf weeds and persistent grasses. It is practical for those managing lawns, garden beds, and larger grounds where a concentrated product reduces trips to the store and provides consistent performance across multiple jobs.

Those who should look elsewhere include users who require selective herbicides for delicate ornamental plants or those who need an organic, non-glyphosate alternative. Also, follow local regulations if glyphosate products are restricted in your area.

Pros & Cons

Pros

• Effective control of tough weeds and grasses, with customers reporting strong results and low regrowth.
• Good value for money for larger properties because the concentrate covers many treatments.
• Fast action with a 30-minute rain fast feature, reducing weather-related application delays.

Cons

• High concentration may require careful handling and precise mixing, which can be a drawback for inexperienced users.
• Not a selective product for delicate ornamentals or for users seeking non-synthetic options.

Specifications

Product	Roundup ProMAX concentrate
Volume	1.67 gallon
Active ingredient	Glyphosate 48.7%
Use type	Post-emergence herbicide for broadleaf weeds
Key applications	Trim and edge, turf renovation, shrub beds, brush and vines
Rain fast	30 minutes

Our Verdict

The Roundup ProMAX 1.67 Gallon concentrate is a strong, cost-effective choice for those tackling widespread or persistent weeds who need a systemic solution with quick rain tolerance. It delivers dependable control and value for larger properties and professional use, though gardeners seeking selective or non-glyphosate options should consider alternatives.

Frequently Asked Questions

Is this product suitable for lawns?
Yes, it is intended for turf renovation and controlling weeds in lawns when applied carefully and according to label directions.

How soon after application can rain occur?
The formula is rain fast within 30 minutes under typical conditions, reducing the chance that light rain will wash away effectiveness.

Will treated weeds regrow?
Roundup ProMAX is systemic and moves to roots to minimize regrowth, and customers report virtually no regrowth when applied correctly.