Thomas Williams presenting at the AVF Summit, Dortmund, September 2023

Thomas Williams presenting 'The Elephant in the Grow Room' at the Association for Vertical Farming Summit, Dortmund, Germany — September 2023.

Critics often emerge as passionate individuals driven by a genuine desire to see improvements in their field. One such individual, Thomas Williams, brings us a thought-provoking presentation entitled 'The Elephant in the Growroom.' While criticism can be irksome, Williams' critical perspective stems from his passion for vertical farming and a strong commitment to its success.

Editorial note: This article was originally published by the Association for Vertical Farming (AVF) on 16 October 2023, and subsequently republished by HortiBiz. It was later withdrawn from the AVF platform following concerns that its findings would discourage investment in the sector — which, in itself, speaks to the importance of the message. This version is reproduced here for the public record, with the author's permission.

Key Takeaways from the Presentation

Survey Results

Williams' presentation includes valuable survey results that provide insights into the performance and standing of vertical farming in the global industry, particularly in the context of salad mix production. The surveys measured two key metrics: kg of marketable yield per m² of land, and kg of marketable yield per m² of lighting.

Farming Method Yield (kg/m²/year)
Open field farming ~4 kg per m² of land
Soil-based greenhouses 14–25 kg per m² (varies by location)
Hydroponics with natural light 45–60 kg per m²
Hydroponics with supplemental lighting (single level) 100–120 kg per m² of lighting
Multi-level indoor farms (average) 45–50 kg per m² of lighting
Multi-level indoor farms (advanced VPD knowledge) 60–80 kg per m² of lighting
Top-performing indoor farms 90–110 kg per m² of lighting

🌿 The Grass Ceiling: A few farms reach yields in the range of 125–127 kg of lettuce per m² of light per year. However, there is one exceptional farm that has broken through this 'grass ceiling' with a remarkable 190 kg of marketable produce per m² of light per year.

Conclusion

Thomas Williams' presentation, "The Elephant in the Grow Room", forces us to confront the harsh realities of vertical farming. Success in this industry requires a profound understanding of plants, efficient automation, sustainable energy, and a deep knowledge of the market and competition. Vertical farmers must navigate challenges to not only break even but thrive in a highly competitive landscape. Only with a comprehensive approach can vertical farming truly flourish.

It is encouraging to see that many respondents in the survey have surpassed breakeven, but it is equally disturbing to observe the significant variation in their costs. As existing wholesalers reduce prices, vertical farmers must brace themselves for tougher competition. The initial battle was relatively easy, but the second fight will be more challenging — and it's only a blip on the radar of what's to come.

Call to Action

Change is inevitable, and vertical farming must be the quantum leap that the tractor was in the 1990s. Some vertical farms will succeed, while others may fade away, but change is undeniable. As the industry faces these challenges, it is crucial for all stakeholders to adapt, innovate, and collaborate to ensure the future viability and success of vertical farming.

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