Messenger of Allah ﷺ forbade the selling of fruits until they were ripe. The Prophet ﷺ added, "It means that they become red ."

أَنَّ رَسُولَ اللَّهِ ﷺ نَهَى عَنْ بَيْعِ الثِّمَارِ حَتَّى تُزْهِيَ قَالَ حَتَّى تَحْمَارَّ