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Environmental Technology
Invested in:
Calculus EISs, Calculus VCT

Weedingtech is a world leader in herbicide-free, non-toxic weed control. Its proprietary Foamstream technology uses a combination of heat and chemical-free foam to kill weeds and moss, offering municipal and agricultural markets a viable and sustainable alternative to commonly-used herbicides which are increasingly associated with serious health issues.

Since Calculus Capital’s first investment in December 2016, Weedingtech has performed strongly, launching a significantly improved product (Foamstream M1200), extending sales reach in Europe and North America, strengthening management and doubling turnover. With Calculus’ support, Weedingtech secured £2.2m funding in April 2019 from a new institutional investor specialising in environmental sustainability and a further £0.2m at a higher price in August 2019. The funds will be used for the continued expansion into the US, sales and marketing and operational improvements.

Significant customers now include the Cities of Munich, Porto, Barcelona and Florence and the Swedish MOD in Continental Europe; London Borough of Hammersmith and Fulham, Wessex Water and AMEY in the UK; and Toronto Metro (Canada), the Cities of Seattle (WA) and Orange Town (NY), the NY State Department of Environmental Protection and Central Park, New York City in North America.


Weedingtech is a world leader in an attractive, growing market, driven not only by general environmental trends, but also by increasing health concerns relating to chemical herbicides. The company is performing strongly with a unique technology, launched products and sales enquiries at record levels.

The new investment will be used to support the launch of Foamstream M600 (a lighter, lower flow model), to enhance North American and European sales capabilities further and to ensure the company has sufficient working capital for its growth.

Latest News

Weedingtech featured on BBC News Online

BBC news reported on Foamstream, the herbicide-free weed control product of Weedingtech, and its use across council parks and other public spaces. Leo de Montaignac, Chief Executive of Weedingtech, was quoted in the article: “I think that we’re only just seeing the very start of this market, and I think that over the next couple … Continued

Foamstream offers landscapers a herbicide-free weed killing option

Since the nationwide controversy surrounding glyphosate and other chemical-based herbicides has yet to reach an end, the European company Weedingtech offered an herbicide-free weed treatment option at this year’s GIE+EXPO called Foamstream. “Whatever you think about the safety of glyphosate and herbicides, we don’t want to get drawn into that argument,” says Leo de Montaignac, CEO … Continued

Leo de Montaignac, CEO of Weedingtech: Public concern over chemical herbicides

Calculus Capital portfolio company CEO, Leo de Montaignac of Weedingtech writes for The Parliament Magazine around the use of glyphosate in public and urban spaces. The primary objective for their product Foamstream was to offer an effective, affordable commercial product as an alternative to traditional chemical herbicides like glyphosate, which could be used in public … Continued

Weedingtech announces new partnership with Riversa

Weedingtech has announced its new partnership with Riversa, the Spanish importers and distributors of products and machinery for professional lawn maintenance. Riversa is an esteemed Toro dealer, having been awarded the Toro Award for Best International Distributor 2017. Weedingtech has taken its technology internationally and formed partnerships across the world with various well-known distributor partners. Partnering … Continued

Meet the CEO – Weedingtech

Following the recent CEO seminar featuring Calculus Capital portfolio company, Weedingtech, we are pleased to present the following video providing an overview of the company from Weedingtech CEO, Leo de Montaignac, and Calculus Capital Investment Director, Alexander Crawford. [youtube id=”TMnzu7se-tw”]Weedingtech are the world’s leading herbicide-free weed control company. Incorporated in 2011 and headquartered in London, … Continued