maturing

fe’l verb

1. To proceed toward maturity: full development or completion (either of concrete or of abstract things, e.g. plans, judgments, qualities).
2. (of food, especially fruit) To attain maturity, to become mature or ripe.
3. To bring (something) to maturity, full development or completion.
4. To make (something, e.g. fruit) ripe or mature.