82 pages ; The growing of low-THC Cannabis sativa L. (hemp) in the U.S. has recently been federally legalized after nearly 50 years of being listed as a Schedule I drug. Since the passing of the 2018 Farm Bill which moved cannabis with no more than 0.3% Δ-9 THC off the Schedule I substances list, there has been a growing need from the industry for researchers to fill the crop production knowledge gap with studies analyzing crop physiology, cannabinoid extraction techniques, pest management strategies, etc. Some companies looking to supply horticultural lights to growers are promoting claims that haven’t been vetted scientifically. Additionally, many cultivators are choosing to grow Cannabis sativa L. in controlled environments. Controlled environment production can be preferable with multiple harvests per year, greater environmental control, optimized labor management, and greater quality control to name a few benefits. However, controlled environment production of cannabis is a large consumer of energy and source of carbon dioxide emissions from systems designed to maintain optimal growing conditions. In chapter 1, I sought to understand the impact of far-red light (700- 800 nm) on plant morphology, photosynthesis, yield, and cannabinoid concentration. In experiment 1.1, I experimented with growing two hemp cultivars at the flowering stage while substituting 10% of photosynthetic photons (PAR; 400-700 nm) with far-red photons. The results revealed significant increases in plant height, reduction in stem diameter, and a reduced flower dry weight with increased far-red. Experiment 1.2 was conducted at the vegetative stage with a supplemental far-red light gradient under a background of white light. As the gradient increased, plant height, stem dry weight, and leaf dry weight increased. Also, leaf level photosynthesis measurements were taken and showed that ‘Janet’s G’ had a higher rate of photosynthesis under lower far-red percentages than at the highest, whereas ‘TJ’ had a higher rate of photosynthesis under the ...