A botanist is a scientist who studies plants. The four crossword solutions for the term 'botanist opening' are ASAS (4 letters), MENDEL (6 letters), FLORA (5 letters), and GREGOR (6 letters). ASAS stands for the American Society of Agronomy and Soil Science, which is an organization that promotes the study of plant science. MENDEL is a reference to Gregor Mendel, an Austrian monk who is considered the father of modern genetics. FLORA is a term used to describe the plant life of a particular region or time period. Finally, GREGOR is another reference to Gregor Mendel, whose work laid the foundation for the field of genetics.