Back to the future: vertical farming

From hanging gardens to vertical farming

From the legendary Hanging Gardens of Babylon, built in the 6th century BCE during the reign of Nebuchadnezzar II (circa 605-562 BCE), to contemporary vertical farming, humanity has always sought creative solutions to cultivate greenery in limited spaces. The Hanging Gardens, a symbol of visionary engineering and an early intuition of harmony between humans and nature, celebrated beauty and prestige; modern vertical farms, on the other hand, address urgent contemporary challenges such as growing urbanization, food security, and climate change. The concept, first outlined in the 1990s by environmental biologist Dickson Despommier, draws inspiration from ancient ideas and leverages cutting-edge technologies to create urban farming environments. In recent years, this practice has established itself as a sustainable and transformative solution, revolutionizing food production and adapting agriculture to the needs of a rapidly evolving world.

Vertical farming is an innovative approach to plant cultivation that utilizes vertical space by employing structures such as towers and skyscrapers to create multi-level agricultural environments. This system optimizes the use of resources like land, water, and energy, making it possible to grow food in urban areas where space is limited. Vertical farming, through technologies like hydroponics (growing in water) and aeroponics (nutrient delivery through misting), provides an effective response to the challenges of population growth and climate change, enabling sustainable food production near population centers.

In parallel, urban farming is becoming an increasingly popular practice in cities, transforming unused or abandoned spaces into productive areas, such as rooftop gardens, community plots, or greenhouses. This type of agriculture promotes sustainability and fosters a stronger connection between people and food production while also enhancing the quality of urban environments.

Benefits

  1. Environmental sustainability: These methods reduce water and land consumption. Hydroponics, for example, uses 90% less water than traditional agriculture.
  2. Consistent and controlled production: Controlled environments guarantee year-round harvests, independent of external weather conditions.
  3. Reduced carbon footprint: Growing food closer to consumers decreases CO2 emissions related to transportation.
  4. Urban revitalization: Unused spaces, like abandoned buildings or factory rooftops, can be transformed into productive areas.
  5. Education and community: Urban gardens encourage environmental and food education while fostering a sense of community.
  6. Reduced pesticide use: Controlled environments protect plants from pests, eliminating the need for chemical pesticides.

Challenges and limitations

Despite its many advantages, vertical and urban farming face some challenges:

  • High costs: The implementation of advanced technologies requires significant initial investment.
  • Energy consumption: Artificial lighting systems, like LEDs, can increase energy use.
  • Accessibility: Ensuring that the cultivated products are economically affordable for everyone is a key challenge.

The future of urban agriculture

The integration of artificial intelligence (AI) is further revolutionizing vertical farming. Advanced sensors monitor environmental conditions such as humidity, temperature, and nutrient concentration in real-time, providing data that AI uses to optimize plant growth.
Robots and drones are employed to plant, harvest, and monitor crops, reducing the need for human labor and increasing overall efficiency.
Vertical farming has the potential to transform how we produce and consume food. With the world’s population growing, the increasing demand for food requires innovative solutions. Vertical farming could help meet this demand while reducing environmental impact.
In the future, these structures might be integrated into residential and commercial buildings, transforming cities into true “urban farms.”

Vertical farming in Italy

Italy is at the forefront of this revolution. In Verolanuova, Brescia province, Europe’s largest vertical farm by surface area was inaugurated in October 2023 by Kilometro Verde. It specializes in producing “petali,” an exclusive line of ready-to-eat salad leaves that don’t require washing. The “teen leaf” salads have medium-sized leaves that are thick, dry, firm, and crunchy.
Kilometro Verde’s vertical farm is fully automated and uses indoor hydroponic cultivation, a method that promotes sustainability, environmental protection, ethics, and healthiness. Hydroponics allows plants to grow without soil, using water enriched with mineral salts to provide the necessary nutrients. This system is particularly suited for areas unsuitable for traditional farming or abandoned land.

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