I guess because pomegranate is made of seeds and seed are essential in fertility
The pomegranate is a symbol of fertility in Armenia. The Apple is a symbol is some cultures. The cherry is a symbol in some cultures.
Hera is the goddess of marriage, women, and birth, and the pomegranate is a symbol of marriage, marital love, and fruitfulness.
Pomegranate
In the Greek mythology, Hera was the goddess of Marriage. Her symbol are the diadem, scepter, pomegranate; the fruit symbol of fertility. Her flower is the lily and her sacred animals were the peacock and crow.
Peacock: Pride Apple: Fertility and marriage (Certainty) Pomegranate: Life and Death (Duality) Cow: Fertility (Later symbol) Crown: Royalty Scepter: Dominance and control
The pomegranate symbolized female fertility and the marital loss of virginity with the consumption of marriage (from both its red stains and rich seeds).
Good Luck and Fertility
pomegranate
pomegranate seeds or grain (:
Here most common symbol is the Pomegranate.
Catherine's royal badge was a picture of a pomegranate. She may have chosen it since it was a fruit tree native to her homeland Spain or because it was a fruit that quite ironically (given what became of her and the majority of her children) symbolized fertility.
Hera is often depicted holding a pomegranate which represents fertility and death.