Cold frames are used for season extension.

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Multiple Choice

Cold frames are used for season extension.

Explanation:
Cold frames trap solar heat to create a warmer microclimate for plants. This makes them ideal for season extension, letting you start seeds earlier in spring and protect transplants from late frosts so you can harvest later into fall. The heat comes from sunlight that warms the soil and air inside, with the transparent cover helping hold that heat during cooler periods. Manage them by venting on warm days to prevent overheating and to keep air circulation healthy. They aren’t primarily about supplying water, decomposing material, or trimming plants, which is why irrigation, composting, and pruning aren’t the main purpose.

Cold frames trap solar heat to create a warmer microclimate for plants. This makes them ideal for season extension, letting you start seeds earlier in spring and protect transplants from late frosts so you can harvest later into fall. The heat comes from sunlight that warms the soil and air inside, with the transparent cover helping hold that heat during cooler periods. Manage them by venting on warm days to prevent overheating and to keep air circulation healthy. They aren’t primarily about supplying water, decomposing material, or trimming plants, which is why irrigation, composting, and pruning aren’t the main purpose.

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