Fetching details from the dictionary...
to ripen; to mature
to be ready for action; to be the right time (to act)
to be in common use; to come to sound natural
to become skilled
庭のトマトがよく熟した。
The tomatoes in the garden ripened well.
庭の柿の実がすっかり熟している。
The persimmons in the garden have fully ripened.
議論が熟すまで結論を急がない。
I won't rush to a conclusion until the discussion matures.