How did the Phoenician sailors replenish their food supplies?

Phoenician seafarers, mainly, when they traveled along their usual routes in the Mediterranean Sea, replenished food and water supplies in their many colonies. And when they sailed around Africa on the instructions of the Egyptian pharaoh, they were on the way for about six months, and then they stopped, sowed wheat and other cultivated plants, waited another six months and eventually reaped the harvest. After that, you could continue the journey. In this regard, sailors circled Africa for three years.