From Zelda Legends Wiki
There are two Maku Trees, one in Holodrum and one in Labrynna. The Maku Tree serves as a guardian of the land, and houses the Oracle of Secrets. In their full strength they can produce a Maku Seed, which can break down magical barriers. In OoS, the male Maku Tree has had its energy drained, and you must recover the Essences of Nature so he can give you a Maku Seed. In OoA, the female Maku Tree must be saved in the past, and you must recover the Essences of Time so she can give you a Maku Seed.