The trees produce edible red or purple fruits, which are described either as epigynous berries or as indehiscent drupes. The fruit is often referred to as a "coffee cherry," and it contains two seeds, called "coffee beans." Despite these terms, coffee is neither a true cherry (the fruit of certain species in the genus Prunus) nor a true bean (seeds from plants in the family Fabaceae). In about 5–10% of any crop of coffee fruits, only a single bean is found. Called a peaberry, it is smaller and rounder than a normal coffee bean. When grown in the tropics, coffee is a vigorous bush or small tree that usually grows to a height of 3–3.5 m (9.8–11.5 ft). Most commonly cultivated coffee species grow best at high elevations, but do not tolerate freezing temperatures. The tree of Coffea arabica will grow fruits after three to five years, producing for an average of 50 to 60 years, although up to 100 is possible. The white flowers are highly scented. The fruit takes about nine months to ripen.