ripener
/ˈrʌɪp(ə)nə/noun
1 Generally. A person who or thing which causes ripening.
2With modifying word, as early, late, slow, etc.: a fruit, plant, etc., that ripens at the time or in the manner specified. Occasionally (by extension) of a person.
3In honey-making: a tank or other device in which honey is allowed to stand until it is ready to be put in jars.
Origin
Late 16th century (in an earlier sense). From ripen + -er. In specific medical use in sense 1a after post-classical Latin maturativum maturative.