Synonyms for "reach its season" include "come to fruition," "achieve maturity," "ripen," "come to harvest," and "come to bloom." These phrases typically refer to the natural progression of plants or crops, as they go through various stages of growth and development. However, these phrases can also be used metaphorically to describe other processes that culminate in a final result or outcome. For example, a project or initiative might "come to fruition" when it is successfully completed or a relationship might "ripen" over time, leading to a stronger bond between individuals. Ultimately, these phrases all capture the idea of something coming to its natural conclusion or endpoint.