Maximum Yield USA February 2019 | Page 34

“CONTROLLING YOUR TEMPERATURE WILL ALSO HELP TO MANAGE MOISTURE LEVELS AS HEAT DRIES UP MOISTURE.” Humidity Humidity levels should be maintained between 70 and 85 per cent. When levels begin reaching 90 per cent and higher, growth slows, fungal diseases start to occur, and early bolting becomes a problem. Keep in mind it can be a challenge to measure humidity levels when air is constantly circulating. Placing multiple hygrometers around your greenhouse can help you get a more accurate reading. If humidity gets too high, you can add a dehumidifier to dry it out. You might also try pruning your plants. Leaves perform a process called transpiration in which they release moisture into the air from pores on their surface, so reducing the foliage should help reduce humidity levels. Proper ventilation and air circulation are also important keys to managing humidity levels in a greenhouse. 34 Maximum Yield So, open doors or vents to reduce humidity. Controlling your temperature will also help to manage moisture levels as heat dries up moisture. If you live in an arid environment and need to increase humidity, you can do this by spraying the floor with water or installing a misting system. Greenhouses can make a wonderful addition to your garden as long as they are managed properly. When you control your temperature, air circulation, and humidity, you can take advantage of extended growing seasons and eat fresh year-round.