Beijing - how / when the city was founded?

Beijing is a city with more than 3,000 years of recorded history and a centuries-old glorious evolution. Evidence of human ancestry dating back to 700,000 years ago has been found in such places as Zhoukoudian in the southwest part of Beijing, where the remains known as 'Peking Man' were found.

While the city's origins can be traced back to over 2,000 years ago, its true significance came about in the early years of the Western Zhou Dynasty (11th century BC-771 BC). During this time the emperor gave the feudal lords under his rule plots of land. One of these plots of land (or feod), called 'Ji City', was the capital of the kingdom 'Ji' at that time. This city was the earliest in Beijing history. By the time of the Eastern Zhou Period (476 BC-221 BC), the kingdom Ji no longer existed, being replaced by the kingdom 'Yan'. However, Ji was still the capital city at that time.

The answer would be plant growth.