At its best, a beautiful yard is an extension of the way you live. It’s where the dog takes a nap in the sunniest spot, where kids play tag, and where you step outside to the patio “for a minute” — and end up lingering until dusk. In that idyllic space, weeds are uninvited guests, and you probably notice them every time you stroll outside. And while you'd love for them to disappear entirely, you don’t want a solution that comes with lingering smells, complicated instructions, or any concerning chemicals.
That’s where Spruce comes in. Developed by a team of scientists at P&G, Spruce Weed & Grass Killer uses a short list of ten ingredients to deliver visible results in one hour, and dead weeds in one day, including cornmint oil, geraniol, and sodium lauryl sulfate (commonly used in soap). These compounds work together to break down the waxy layer on a weed’s surface and dehydrate the plant from the top down. “You’ll start to see discoloration and wilting begin almost immediately,” says Mary Jane Watson, a senior scientist who helped develop the formula. “The weed is dead within a day.”
Watson, who’s worked on product innovation at P&G for nearly 30 years, says Spruce Weed & Grass Killer was designed to address a longstanding gap in the lawn and garden market. “The biggest misunderstanding is that weed killers with simple ingredients can’t be effective,” she says. “That’s just not true.” And she adds, “Another myth is that hand-pulling weeds is the best method, but that’s not necessarily the case.” That’s because many weeds can regrow from the roots left behind, making manual removal more time-consuming.
Clear ingredients, full transparency
Something people typically notice when they try Spruce? The aroma. If you’ve ever walked through the lawn-care aisle at a hardware store, you recognize the overpowering chemical odor that seems to cling to everything in a 10-foot radius. Spruce is different: Thanks to its essential oil base, particularly the cornmint, it smells light and fresh, not medicinal.
“It’s one of the things we hear most often: People are surprised that it doesn’t smell like a weed killer,” says Watson. “That wasn’t something we set out to do, but it’s been a welcome discovery.” Transparency is another big part of the product’s identity: The ten ingredients are listed on the label, along with their respective purposes. It even comes in a clear bottle, something Watson says was a deliberate design choice. “People should be able to see what they’re spraying and know what’s in it.”
Walking the walk
Of course, safety claims in the home-care space can sometimes sound more like marketing than science. That’s why Spruce Weed & Grass Killer has gone after third-party certifications, earning the Good Housekeeping Seal, USDA Biobased certification, and Parent Tested Parent Approved (PTPA) status. It’s also partnered with animal welfare organizations like Best Friends Animal Society, Fear Free Happy Homes, and SPCA Cincinnati.
“These endorsements help show that we’re not just saying this spray is safe. It truly is,” says Watson. “We’ve been really intentional about earning consumer trust in ways that go beyond the bottle.”
Rethinking weed control
Ultimately, what Spruce Weed & Grass Killer offers isn’t just a unique solution for tackling weeds — it’s a shift in what shoppers should expect from weed control itself. “People want to take care of their yards, but they also want to take care of their families, pets, and the planet,” says Watson. “They shouldn't have to choose one over the other.”
