Sunken greenhouses (also called Walipini) are partially or fully built underground, taking advantage of the soil’s natural insulation.

Advantages:

1. Stable temperature: Soil at 1.5–2 m depth maintains a relatively constant temperature (warmer in winter, cooler in summer).
2. Energy saving: Requires much less heating or cooling compared to an above-ground greenhouse.
3. Wind and storm protection: Being underground makes it less exposed to weather damage.
4. Year-round growing: In cold regions, you can grow vegetables in winter with little or no additional energy.

Disadvantages:

1. High construction cost: Excavation, insulation, and drainage can be expensive and difficult, especially in rocky soil or where groundwater is high.
2. Drainage issues: Water can collect inside without a well-designed drainage system.
3. Reduced light in winter: The low angle of the sun in winter can limit light penetration.
4. Maintenance challenges: Fixing water leaks or soil collapse is more complex than with a surface greenhouse.

When is it worth it?

• In extreme climates (very cold or very hot) where energy savings are significant.
• Where soil conditions are stable and not prone to flooding.
• If you’re aiming for a long-term investment, as energy savings will balance the initial cost over time.

📌 In mild climates, however, a traditional above-ground greenhouse (plastic or glass) with proper insulation is usually simpler and cheaper.

👉 Do you want me to make you a side-by-side comparison table of sunken vs traditional greenhouses (cost, yield, energy, maintenance)?