"Most beanstalk" is not a widely recognized term, and therefore, there are no direct antonyms for it. However, we can explore the meanings of the individual words to come up with opposite terms. "Most" refers to the greatest amount or quantity of something, so antonyms for it could be "least," "minimal," or "smallest." "Beanstalk," on the other hand, is a type of plant that grows quickly and tall, so antonyms for it could be "short," "stumpy," or "dwarf." By combining these antonyms, we can create phrases like "least dwarf plant" or "smallest stumpy growth" that have the opposite meaning of "most beanstalk.