Underground green house

Today I started digging what will be my underground/earth berm house. Could anyone offer any suggestions?

Grow food all year round in an underground greenhouse. Here's how

Growing plants year-round, especially in cooler or fluctuating climates, can be a challenge. However, an underground greenhouse, also known as a ‘walipini’ or ‘pit greenhouse’, offers a sustainable solution. Leveraging the Earth’s natural insulation, these greenhouses maintain more consistent temperatures, protecting plants from harsh weather conditions and extending the growing season.

The word Walipini, derived from the Aymaran language and an indigenous Bolivian tribe, is translated as “a place of warmth” and is an earth sheltered cold frame or transparent-roofed enclosure. This underground greenhouse was created for the cold regions of South America to maintain food production year round, but is now being adopted by gardeners […]

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How to build your own underground greenhouse with constant temperature all year long – WAWstock

Here's how to create a $300 in-ground greenhouse for growing crops 365 days a year, even in cold climates.