The term 'become ready to pluck' can be summarized by the crossword solution 'RIPEN'. To RIPEN means to reach a stage of maturity or readiness, usually referring to food. When fruits and vegetables are ripe, they are ready to be picked and eaten. Therefore, the term 'become ready to pluck' can be interpreted as the process of ripening, which is the natural process of maturing and developing until it is ready to be harvested.