A 6.5-ft by 5.6-ft mini walk-in greenhouse that stretches the growing season for potted citrus, leafy greens, and rooted cuttings once night temperatures drop. The heat-preserving PE cover resists tearing and shrugs off sun, rain, and wind, while braced PE-coated metal tubes hold the roof taut instead of sagging under a downpour. A 47-in wide roll-up door straps open so wheelbarrows and tall pots pass through freely, and two double-layer screen windows trade stale humid air for fresh. Wind ropes, ground stakes, and stone-weighted cover edges keep the 10.5-lb frame planted.