why is the pomegranate (ροδι) considered lucky?

Answer 1

Because of the many seeds it contains when it breaks, it is a symbol of abundance and fertility.

Answer 2

What is this contradiction called a pomegranate? The pomegranate is sweet, but the pomegranate is tart. The pomegranate is tough and wrinkled, but when cut open it glistens with ruby-like seeds.In the Greek myth of Persephone, the pomegranate is called the fruit of the underworld, yet in the Muslim Qu'uran it is called the fruit of paradise.

The inner beauty of the pomegranate has inspired design since Biblical times, and there are some who believe it may be the fruit on the tree of life.

Answer 3

The pomegranate is considered in many civilizations as the fruit of abundance. In China is given to newly weds to invoke fertility and the same was done in Ancient Greece. In Egypt pomegranates were buried together with the dead.
Zoroastrianism holds it in high respect, and for them the pomegranate being an evergreen plant is considered to be an emblem of immortality of the soul.
This belief with minor differences applies to all the cultures of the region. In all the middle east the pomegranate is considered important as emblem and fruit.