November-March of the following year. Guavas are most delicious from November to March of the following year; guavas will be ready for the market from June to August, but their taste may not be as good as in winter. Guava (Psidium guajava L.), also known as guava, chicken fruit, gum fruit, etc., is an evergreen small tree of the genus Psidium in the Myrtaceae family.