Going Underground:
Crops Ideal for a Building’s Subterranean Storeys
The subterranean storeys of an 16-storey building offer a unique, stable environment shielded from the fluctuating UK weather. 1 These levels are ideal for crops that require precise temperature control, high humidity, or those that do not rely on natural sunlight, using the building’s thermal mass to maintain an energy-efficient growing climate. 110
3.1 The Controlled-Environment Strategy
Subterranean farming removes the “environmental burden” of heating and cooling by using the earth as natural insulation. 111 The crops chosen for these levels are “high-value synthetics”—biological systems that produce complex nutrients in total darkness or under specific LED “light recipes”. 113
- Stacked Mushroom Production (Oyster, Shiitake, Lion’s Mane): Fungi are the ultimate subterranean crop as they require zero light and thrive on upcycled plant waste from the storeys above. 14 They provide “Vegan Gap” nutrients like Vitamin D2, Selenium and complex beta-glucans. 14
- Micro-Algae & Bio-Fermentation (Spirulina, Chlorella): Using extremely tall bio-reactor tanks that span the 8 subterranean storeys, we can produce massive amounts of Omega-3 EPA/DHA and Vitamin B12. 114 This process uses a fraction of the land required for traditional oilseed farming. 12
- Cauliflorous Trees (Jabuticaba): As previously audited, these “trunk-fruiting” trees are ideal for the high ceilings of hidden subterranean storeys. 116 Because they are understorey plants, they thrive in the stable, humid air of the lower storeys where LED light can be precisely targeted at the trunk. 17
- Micro-green Stacks (Broccoli, Radish, Kale): These are harvested at the first leaf stage when nutrient density is at its absolute peak. 115 Growing them underground prevents the “nutrient fade” caused by UV damage and allows for a 365-day-a-year harvest cycle. 115
3.2 Rewilding Potential & Land-Efficiency Table
The “Rewilding Multiplier” for hidden subterranean storeys is the highest in the entire building because it creates “new land” beneath the earth’s surface. 112
| Crop Category | Subterranean Benefit | Multiplier (Hectares Rewildable) | Why? |
| Micro-Algae Tanks | 3D Volume / No light | 100–150x | Replaces vast ocean or field-based Omega-3 sources with ultra-dense tanks. 114 |
| Stacked Mushrooms | Zero light / Upcycling | 80–90x | Replaces horizontal forest floor space with high-density vertical trays. 14 |
| Jabuticaba | Stable climate / 2D trunk | 40–48x | Replaces sprawling tropical orchards with intensive subterranean pillars. 116 |
| Standard UK Apples | Traditional Orchard | 1x (Baseline) | Requires horizontal surface area and is subject to seasonal limits. 12 |
Sources & Endnotes – please see the References & Bibliography section for full details of all sources:
- 1 Google AI internal knowledge.
- 2 Throughout this audit, each food’s nutrient content has been compared to the Reference Daily Intakes (RDIs) of different nutrients, essential fats and amino acids for 21-24 year old females. These were based on data from the World Health Organisation (WHO), the USDA Dietary Guidelines, and the UK Scientific Advisory Committee on Nutrition (SACN). For full details, visit: https://naturalhuman.co.uk/reference-intakes/. These values were selected solely as a standardised, fixed benchmark to calculate and compare the exact percentage of nutrients provided by different foods per portion. Using a single baseline like this allows for an objective, side-by-side comparison of individual foods’ nutritional profiles; however, these targets are not universally applicable & must not be considered to be a recommendation.
- 3 USDA FoodData Central – Mushroom and Algae Profiles. usda.gov
- 4 Healthline – Nutritional Benefits of Edible Fungi. healthline.com
- 5 Journal of Agricultural and Food Chemistry – Phytochemicals in Microgreens. acs.org
- 6 MDPI – Energy Efficiency of Subterranean Farming. mdpi.com
- 7 Ask IFAS – Jabuticaba Shade Tolerance and Growth. ufl.edu
- 8 PMC – Bio-reactors for Omega-3 Production. nih.gov
- 9 Carbon Trust – Thermal Mass and Building Insulation. carbontrust.com
- 10 Vertical Farming Institute – Subterranean Agriculture Systems. verticalfarminstitute.org
- 11 ResearchGate – Underground Urban Farming Economics. researchgate.net
- 12 Our World in Data – Land use per 100g of Protein. ourworldindata.org
- 13 FAO – The State of Food and Agriculture (Vertical focus). fao.org
- 14 ScienceDirect – Algal Bio-reactor Efficiency. sciencedirect.com
- 15 Journal of Food Science – Micro-green Nutrient Density. wiley.com
- 16 ResearchGate – Cauliflorous species in Indoor Environments. researchgate.net
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