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Lowe's RM43-2 Concentrated Pre-Emergent Weed Grass Killer

TLDR Review: Lowe's RM43 Weed Killer

By ShopSavvy Team

Published: June 22nd, 2026

Pros

•Very effective at controlling tough weeds and unwanted grass
•Visible results often appear within a short time, sometimes as quickly as 8 hours
•A small amount covers a large area, making it cosffective
•Easily applied around fences, driveways, and difficulo-reach areas
•Lonasting weed suppression, sometimes over 2 months or even up to a year
•Only one application per year is needed, adding convenience
•Performs reliably for both residential and farm use
•Suitable for spot treatments and areas around decks or under decks
•Lonerm satisfaction reported by users who've used it for years
•Works best on sunny, hot days for optimal weeilling power

Cons

•Takes over 2.5 weeks to see complete weed death, which can feel slow
•Requires a higher amount of product for taller weeds, indicating some inefficiency with standard dosage
•Slightly expensive compared to other brands, though many say it's worth it
•Long wait time for visible results might be frustrating for impatient users
•Needs to be applied correctly in sunny conditions to maximize effectiveness
•Some users found it to be more costly but justified by its performance

Bottom Line

Based on reviews, Lowe's RM43-2 Concentrated Pre-Emergent Weed Grass Killer is a powerhouse for tough weed control with long-lasting results. While it does take a few weeks to see full effects, its high effectiveness and low reapplication frequency make it a reliable choice for serious weed management. If you prefer quicker results or are on a tighter budget, you might want to consider other options, but for heavy-duty weed control and long-term suppression, this product performs well.

How we researched this

About this review: We pulled together findings from professional reviews and hundreds of user reviews, and cross-referenced them with ShopSavvy's pricing data from 1 retailers to give you the short version.

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