Home / Blog / 5 Reasons Why Urban Farming Just Works On Rooftops

5 Reasons Why Urban Farming Works on Rooftops

In urban areas with limited space, rooftops are a popular choice for not only

outdoor gardens and farms but also indoor farms.

5 Reasons why urban farming just works on rooftops

Beyond the obvious space advantages to rooftop farming, there are several other reasons why rooftops are more advantageous for agricultural production.

percentage of urban area needed to meet the recommended consumption of vegetables by urban dwellers

Urban agriculture implementation will have different limits in different geographical areas of the world.

As the world population residing in urban areas is projected to nearly double by 2050, these trends will become increasingly vital to fresh food production in urban areas.

1. Retention of rainwater

Depending on the type of growing medium you are using, agricultural units on urban roofs can retain up to 90% of rainwater which can in turn increase production and growth without constant manual watering or time consuming set up of self watering systems.

Depending on your location and the type of crop you are growing on your roof, this water access and retention capability may be a huge advantage for your crop growth.

rain rooftop urban farming

precipitation per unit area across the world, 1961-1990

2. Ample expansion space (relative to urban options)

As previously mentioned, rooftops are first and foremost ideal for urban agriculture due to their space potential. According to American Rivers, there is over 4.85 trillion sq ft of roof space in areas with populations above 50,000 people in the United States alone, and currently less than .1% is utilized, despite over 25% growth year over year for urban agriculture on rooftops since 2010.

One special note to keep in mind before starting your rooftop urban farming project: Green Roofs for Healthy Cities suggests that the majority (perhaps as high as 95%) of current roofs are strong enough to support a full scale urban farm with all of the necessary growing medium layers (image below).

Interested in growing on your roof but not sure about your roofs stability? Talk to our friends at Recover Green Roofs.

urban farming on the surface of the roof itself usually requires special support (source)

3. Decreased likelihood of some pests and human interference

Since the beginning of agriculture, pests have been a continual and evolving challenge for growers.  Pests *will* still be a risk on rooftops (rodents, birds, common insects) however, rooftop plants will be inaccessible by larger urban animals like rabbits or even deer. Additionally, rooftops will be less susceptible to disruption from human traffic. As far as limiting insects with your urban rooftop crops, the first place to look for a solution may be bolstering the health of your soil or growing medium.

rabbits pests urban farming

pests like rabbits will be less of an issue on rooftops (source)

4. Air Flow Benefits

Urban and greenhouse farming research from the University of Massachusetts at Amherst points out that maintaining horizontal air flow in greenhouses with the use of fans is important for improving quality of the products grown in the greenhouse. Depending on the geographical location of outdoor urban rooftop farms, natural air flow conditions may provide similar benefits to crop production that fans would provide in a greenhouse. According the UMass research,

"During daylight hours, photosynthesis depletes the carbon dioxide that is in the boundary layer of air next to the leaf.  Moving air will replace this depleted air with fresh air having a higher carbon dioxide content".

5. Effect of urban noise on urban rooftop plant growth

plant growth with and without music: benefits of urban noise for urban rooftop farming

The effects of urban noise may be beneficial for rooftop plants. Source

Botanical studies from as early as 1962, have shown that ambient sound can have a positive effect on the production of agriculture. In fact, the difference in plant health between those grown with sound and those grown without sound has in some instances not even been close, with plants cultivated in the presence of ambient sound having growth acceleration in excess of 20% and increased biomass of 78%.

But how much more sound is present on an urban rooftop than a rural plot of farmland? According to Engineering Toolbox, the level of audible sound in rural wilderness areas tends to average to about 30-40 dBA whereas average sound levels in urban areas will usually approximately 85-90 dBA .

6. (bonus) Access to Sunlight

Olive Tree's with yellow sky and sun, Vincent Van Gogh, 1889 source

One key advantage of rooftop growing is access to sunlight. On the street level or indoors, light can be a serious issue and deficiency for urban crops.


For these reasons, urban rooftops may be the best place to start with an urban farm, as plant's will have the maximum possible access to natural sunlight, and this will directly increase yield.

and that's not all: because of the warmth provided by this extra sunlight exposure, rooftop urban farms will often have a "season extension" effect, meaning you can start growing slightly earlier in the spring and grow slightly longer at the end of autumn.

Explore other small-scale urban agriculture tips and tricks at urbanvine.co/blog

(Bonus Bonus) Cons To Rooftop Growing:

At the request of some readers we've added in a couple cons to rooftop growing:

1) Weight: some roofs will not be approved for the weight required to make rooftop growing viable

2) Zoning: Some roof spaces will prohibit certain or any activities on building roofs. Check with relevant property authorities before making any building plans!

Asia Vertical Farming Companies: The 2023 Report

Download the Free Sample Report

Mark-Horler

"For a target audience that is trying to understand the basics of vertical farming, this is a quality newsletter to subscribe to"

- James Pateras, CEO, Modular Farms Australia

North America Vertical Farming Companies: The 2023 Report

Download The Free Sample Report

Mark-Horler

"The North America Vertical Farming Companies Report 2023 aggregates many sources of public information on many different companies so that you don't have to do the research yourself, it's worth the money and saves a lot of time"

- John Ireland, CEO, NTP Technologies

Europe Vertical Farming Companies: The 2023 Report

Download the Free Sample Report

Helen Andrew Spare Harvest

"As a business development manager supporting the indoor agriculture, CEA, and food tech industries, I can say Urban Vine guides and their insider newsletter provide detailed information often difficult to find online."

- Irena Lundberg, CleanTech Invest Stockholm

Middle East Vertical Farming Companies: The 2023 Report

Download the Free Sample Report

Mark-Horler

"As a marketing professional in the indoor agriculture industry, Urban Vine's newsletters, reports and guides are an excellent resource for keeping up-to-date with news and developments in vertical farming."

- Steven Mitchell, Product Manager, Intelligent Growth Solutions (IGS) UK

All Indoor Farming Company Interviews

Heartee Foods

December 10, 2023

This interview details Heartee Foods, an indoor farming company based in Canada. The interview is with Jonathan Murray, Co-Founder & CEO of Heartee Foods. To learn more about Heartee Foods and other indoor farming companies, click on this link!

View Full Interview

Moleaer

December 10, 2023

This interview details Moleaer, an Advancing Nanobubble Technology company based in the United States. The interview is with Sebastian Sanchez Gerritsen, Sr. Business Development Manager at Moleaer. To learn more about Moleaer and other indoor farming companies, click on this link!

View Full Interview

Sozo

December 10, 2023

This interview details Sozo, an indoor farming company based in the United States. The interview is with Kristi Kelly, Chief Strategy Officer of Sozo. To learn more about Sozo and other indoor farming companies, click on this link!

View Full Interview

Ridder

December 10, 2023

This interview details Ridder, an indoor farming technology company based in China. The interview is with Fulco Wijdooge, General Manager of Ridder. To learn more about Ridder and other indoor farming companies, click on this link!

View Full Interview

Plant Factory

December 10, 2023

This interview details Plant Factory, an indoor farming company based in Turkey. The interview is with Halil Beşkardeşler, Co-Founder of Plant Factory. To learn more about Plant Factory and other indoor farming companies, click on this link!

View Full Interview

GrowUp Farms

December 15, 2023

This interview details GrowUp Farms, an indoor farming company based in the UK. The interview is with Kate Hofman, Founder & Brand Director of GrowUp Farms. To learn more about GrowUp Farms and other indoor farming companies, click on this link!

View Full Interview

MightyGreens

December 10, 2023

This interview details MightyGreens, an indoor farming company based in Brazil. The interview is with Natale Papa, CEO of MightyGreens. To learn more about MightyGreens and other indoor farming companies, click on this link!

View Full Interview

Grobrix

December 10, 2023

This interview details Grobrix, an indoor farming company based in Singapore. The interview is with Mathew Howe, Founder of Grobrix. To learn more about Grobrix and other indoor farming companies, click on this link!

View Full Interview

RED Horticulture

January 22, 2024

This interview details RED Horticulture, an indoor farming technology company based in France. The interview is with Louis Golaz, CEO of RED Horticulture. To learn more about RED Horticulture and other indoor farming companies, click on this link!

View Full Interview

Ditto

December 8, 2023

This interview details Ditto, an indoor farming company based in the United States. The interview is with Derek Drake, CEO of Ditto. To learn more about Ditto and other indoor farming companies, click on this link!

View Full Interview