Tomatoes are daylength neutral, meaning that they have no specific requirements for periods of darkness, but they use the dark hours of the night to transfer food made by photosynthesis to developing fruit. Hydroponic and greenhouse plants benefit from 6 hours or more of darkness for productive plants and superior fruit.
About this Author
Chicago native Laura Reynolds has been writing for 40 years. She attended American University (D.C.), Northern Illinois University and University of Illinois Chicago and has a B.S. in communications (theater). Originally a secondary school communications and history teacher, she's written one book and edited several others. She has 30 years of experience as a local official, including service as a municipal judge.