In the spiritual world of Vṛndāvana the buildings are made of touchstone, the cows are known as surabhi cows, givers of abundant milk, and the trees are known as wish-fulfilling trees, for they yield whatever one desires. In Vṛndāvana Kṛṣṇa herds the surabhi cows, and He is worshiped by hundreds and thousands of gopīs, cowherd girls, who are all goddesses of fortune. When Kṛṣṇa descends to the material world, this same Vṛndāvana descends, just as an entourage accompanies an important personage. Because when Kṛṣṇa comes His land also comes, Vṛndāvana is not considered to exist in the material world. Therefore devotees take shelter of the Vṛndāvana in India, for it is considered to be a replica of the original Vṛndāvana. Although one may complain that no kalpa-vṛkṣa, wish-fulfilling trees, exist there, when the Gosvāmīs were there, kalpa-vṛkṣa were present. It is not that one can simply go to such a tree and make demands; one must first become a devotee. The Gosvāmīs would live under a tree for one night only, and the trees would satisfy all their desires. For the common man this may all seem very wonderful, but as one makes progress in devotional service, all this can be realized.
Ref >> Srila Prabhupada Vani.