Abstract Scholarly opinion exists that nutrition can play a vital role in the development and growth of hornworms. The current research analyzed this hypothesis using four food types for the purposes of comparison. The researchers exposed the hornworm larvae to tobacco, tomato, and radish plants, and to the solid food. After this, the researchers monitored the daily weight changes in larvae exposed to every type of nutrition, and made the conclusion that the most efficient food type for the hornworms was the solid food. Concerning the plant food types, their effectiveness was highly doubted, while the tobacco plants in particular proved to even reduce the weight and functioning of hornworm larvae. This was supposed to be the result of greater maturity of tobacco plants and larger concentrations of nicotine in their leaves. After discussing these findings, the researchers suggested directions for further studies in the topic and analyzed the implications of the current research findings for the overall topic development. Introduction The issues surrounding the development of living forms on Earth have always been of crucial importance for human beings. Drawing from this, scholars take their time to investigate the conditions of development of this or that animal species, bird, or insect in laboratory environment to be able to project the results to actual environment settings. The current paper also focuses on the topic that presents crucial interest, i. e. the growth of tobacco hornworms under the conditions of feeding them by tobacco, tomato, and radish plants and solid food. Accordingly, the major purposes of this work include to study the process of hornworms’ growth in the laboratory conditions using the above mentioned feeding materials and to react to the null hypothesis that the solid food facilitates faster and more essential growth of hornworms in laboratory conditions. Materials and Methods Materials Used The research process required the substantial numbers of Tobacco Hornworms to be delivered to the laboratory. Therefore, the first step in acquiring the necessary research materials was the order of the hornworms that were later delivered from two major locations, i. e. the Mulberry farms and the Carolina Biological Supply. Of course, the research required the plants and the solid food for the purposes of hornworm feeding. Accordingly, the Brown University provided the tobacco plants grown in its greenhouse, while the Carolina Biological Supply helped the researchers with the seeds for tomato and radish plants that were further grown in a specially equipped greenhouse-trailer. Such an approach provided the researchers with the guarantee of objectivity and uniformity of data, as any results of the study could be attributed to hornworms’ reactions to various feeding sources, but not to the differences in those sources. The solid food for the experiment was developed directly by researchers. The plants were cultivated using potting soil and the Shultz fertilizer, while their photoperiod was 12 hours, usually from 7a.m. to 7p.m. The process of plants growing was accompanied by replacement of some of them. In particular, tomato and radish plants were replaced once or twice a day, depending on the leve