TLDR Review: Lowe's RM43 Weed Killer
Verdict
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.
- Top pro:
- Very effective at controlling tough weeds and unwanted grass
- Top con:
- Takes over 2.5 weeks to see complete weed death, which can feel slow
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 cost-effective
- •Easily applied around fences, driveways, and difficult-to-reach areas
- •Long-lasting 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
- •Long-term satisfaction reported by users who've used it for years
- •Works best on sunny, hot days for optimal weed-killing 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
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How we researched this
About this review: it summarizes the professional reviews and customer ratings ShopSavvy collected for this product, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Jun 22, 2026.
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