Multi-span greenhouse is a type of greenhouse that connects multiple smaller greenhouse units, or "spans," into a single, larger structure. This creates a continuous, large, and open growing space, allowing for greater control over the growing environment and more efficient use of resources.

Features
1. Continuous Space: Unlike single greenhouses, a multi-span design has a large, uninterrupted internal area without dividing walls, making it easier to manage climate, lighting, and humidity uniformly.

2. Climate Control: Multi-span greenhouses are easier to control for temperature, humidity, and airflow, which is ideal for cultivating plants that require a consistent environment.

3. Structural Strength: They are often constructed with stronger materials and design reinforcements (such as steel or aluminum frames) to support larger spans, making them durable against external weather conditions.

4. Scalability: With the multi-span design, it’s easier to expand as additional spans can be added to the structure, accommodating more plants without having to build a separate greenhouse.

5. Efficiency: The larger growing area reduces energy costs, as the heating and cooling systems can cover a wider area more efficiently.

6. Multi-span greenhouses are commonly used in commercial agriculture, as they allow for higher yields and more cost-effective operation than traditional single-span greenhouses.