Based on the birth date, astrologers fix the birth star of a person and based on the birth star, the traditional system of astrology assigns a specific tree mentioned in the Vedas to it. These specific trees are named Nakshatra Shanthi. Each zodiac tree is said to have medicinal, social and aesthetic values that correspond to the characteristics and ethos of the particular star.
As an example of the various Nakshatras trees, below is information of the Banyan whose Nakshatra is Magam(Maka).
The banyan, Ficus benghalensis, is a large fig tree belonging to the mulberry family, Moraceae. It grows in India and Bangladesh and is held sacred in both places. The tree begins life as an epiphyte on a host tree, gathering its nourishment and water from the air. As it grows, its lateral branches send down aerial supporting roots that become absorbing roots when they reach the ground. Eventually, the host tree is smothered as the banyan continues to send out more branches and roots. The mature banyan's canopy may cover an area more than 300m (1,000 ft) in diameter. The leathery, evergreen leaves are up to 20 cm (8in) long. The reddish figs are eaten by birds and bats.
For fuller information on all the nakshatra trees and of the services offered by the Nakshatra Dhyaan Temple please check this link.