Growing strong healthy vegetable plants optimally starts with strong healthy young plants. Retractable roof greenhouses help growers produce young plants with smaller, but thicker leaves, shorter, thicker stems and a strong healthy root system. This combination helps young plants make the transition from the nursery greenhouse to the production field, greenhouse or net house. These transplants become established quickly, and have the strongest possible resistance to insects and disease, helping to minimize transplant losses while minimizing the time to the first harvest.