Growing Tip: Temperature July 10, 2014 Growing Tips Maintaining proper temperature is crucial for a successful harvest. Many fast growing annuals that have high light requirements prefer daytime or lights on temperatures of 75 – 85 degrees Fahrenheit and a drop of 10 – 15 degrees Fahrenheit during the night or dark cycle. Don’t let improper temperatures be the weakest link in your hydroponic garden. Leave a Reply Cancel ReplyYou must be logged in to post a comment.