The benefits of vertical farming

Controlled Environment Agriculture (CEA) is more commonly known as vertical farming. This is because it’s the practice of growing crops in stacked layers in a controlled, indoor environment. The other main characteristic of vertical farming is that crops are grown using soil-free techniques, usually in a closed-loop water system containing all the nutrients needed.

Hydroponics

You may think that because most vertical farms use hydroponic growing methods, they require huge amounts of water. But in fact the opposite is true. The estimated water savings for hydroponics are 90%-95% when compared to traditional outdoor farming use. This is because the water is held in a closed water system. The water is constantly recirculating rather than draining into the ground, meaning less is ultimately needed to nurture a plant from seed to harvest. As an example, it is estimated that, on average, it takes 130 litres of water to grow a kilogram of lettuce outdoors, yet hydroponics could use as little as 6.14 litres of water.

Aeroponics

The water efficiency of vertical hydroponic farming is staggering - and the water savings are even more profound with another branch of soil-free farming, aeroponics. In aeroponics, the plant roots are suspended in the air and irrigated with nutrient-dense mists dispersed using ultrasonic sound waves. The precision achieved means even less water is required.

It’s not difficult to see how, after experiencing a summer of water stress, we find the idea of vertical farming so fascinating. And it’s not just the incredible water savings that make it exciting.

There is no nutrient runoff

The nutrients needed to fertilise the soil in traditional agriculture have long been a problem for the environment. With the closed water system of a vertical hydroponics farm, there is no runoff at all. The nutrients are recirculated until they are used which means nothing is wasted.

No pesticides are needed

In the controlled indoor atmosphere of a vertical farm, there is little or no need for pesticides and herbicides. Without the need to spray the crops, no pesticides will enter the atmosphere where they could harm organisms they were not intended to affect - including humans.

Higher yields

In a closed and controlled environment, it is easier to produce healthy, more uniform crops, leading to greater harvests and less waste. Nick Green of CEA developer Shockingly Fresh told The Guardian that its Worcestershire greenhouse facility had the capacity to grow four times the yield usually harvested on the same-sized patch of land.

It attracts big investors

Big businesses are seeing the advantages of vertical farming and are willing to invest. In 2021, Ocado invested ￡5m with the Jones Food Company to help it build what will become Europe’s largest vertical farm just outside Bristol.

Fresher food and fewer food miles

With CEA you can grow fresh foods 365 days a year, eliminating the need to import food from other countries out of season. With a controlled climate, it’s possible to grow summer fruits such as strawberries at any time of the year. And with less time taken between harvesting and eating, the food is more likely to taste better too.