That shorthand is understandable because sunlight passes through clear material in both cases. For planning and daily use, however, their forms are quite separate. The frame stays low and is tended while the gardener remains outside. The greenhouse surrounds both gardener and crop, providing greater vertical clearance, substantially more enclosed air and a wider range of working arrangements.

The enclosure may buffer hardy crops against rain, wind and brief cold spells, but frost can still reach them. Performance changes with the crop, how tightly the lid closes, solar gain, breeze, moisture in the soil, the overnight low and any added covering. Bright days also demand venting, even in cool weather, because damaging heat may accumulate.

Yes. It offers shelter, organises propagation and makes the shoulder periods of spring and autumn more usable. Available daylight and outside conditions still govern what happens inside. Tender plants kept through winter may call for heat, supplementary lighting and disciplined ventilation, all assessed against continuing energy costs.

Start by acclimatising young plants, a useful task with manageable risks. Try sturdy salad crops or brassica seedlings, monitor temperatures and learn when the lid needs moving. After observing the response to sunshine, clear nights and wind at your plot, introduce earlier or later salad sowings.

First assess the location and crops you intend to raise, then allocate working room for staging, paths, water and airflow. Nominal floor size tells only part of the story. Long-term usefulness also depends on entrance clearance, overhead vents, glazing, secure fixing, drainage, site exposure to wind or snow and convenient daily access. See our overview of aluminium greenhouses to see how the same walk-in concept works across smaller and more spacious garden sizes.