Start seedlings or extend your growing season with the GrowIT 6 x 8 ft. Backyard Greenhouse with Integrated Shelving. This easy-to-assemble, compact Greenhouse is constructed with high quality steel and features 4 ft. shelving on both sides for built-in staging of plants. Screen vents at both ends provide airflow and temperature control. The translucent fabric allows a significant amount of diffused light to reach the plants.