Roll-up sides create needed ventilation for plants growing in greenhouses. Even during cold weather, a greenhouse can get too warm on bright, sunny days. Roll-up sides can be built into any greenhouse to control temperatures and humidity in all seasons. Fresh outside air is swept in through the roll-up sides as the warm air filters out. In addition to cooling the greenhouse, roll-up sides change the air and improve growing conditions within the greenhouse. The roll-up sides include all…