Gaokerena

Gaokerena or White Haoma is a tree in Persian mythology whose vivacity ensures continued life in the universe, and grants immortality to "all who eat from it". The bird Simurgh perches atop a tree located in the center of the heavenly sea Vourukasa. In the Pahlavi Bundahishn, it is said that evil god Ahriman created a giant marine reptile, either described as a lizard, turtle or frog, to destroy the sacred tree. The tree was protected by the ten Kara fish created by Ahura Mazda, the god of light.

In the Avesta[]

The physical attributes, as described in the texts of the Avesta, the primary religious texts of Zoroastrianism, include:

the plant has stems, roots and branches (Yasna 10.5).
it has a plant asu (Yasna 9.16). The term asu is only used in conjunction with a description of haoma, and does not have an established translation. It refers to 'twigs' according to Dieter Taillieu, 'stalk' according to Robert Wasson, 'fibre' or 'flesh' according to Ilya Gershevitch, 'sprouts' according to Lawrence Heyworth Mills.
it is tall (Yasna 10.21, Vendidad 19.19)
it is fragrant (Yasna 10.4)
it is golden-green (standard appellation, Yasna 9.16 et al.)
it can be pressed (Yasna 9.1, 9.2)
it grows on the mountains, 'swiftly spreading', 'apart on many paths' (Yasna 9.26, 10.3-4 et al.) 'to the gorges and abysses' (Yasna 10–11) and 'on the ranges' (Yasna 10.12)

The indirect attributes (i.e. as effects of its consumption) include:

it furthers healing (Yasna 9.16-17, 9.19, 10.8, 10.9)
it furthers sexual arousal (Yasna 9.13-15, 9.22)
it is physically strengthening (Yasna 9.17, 9.22, 9.27)
it stimulates alertness and awareness (Yasna 9.17, 9.22, 10.13)
the mildly intoxicating extract can be consumed without negative side effects (Yasna 10.8).
it is nourishing (Yasna 9.4, 10.20) and 'most nutritious for the soul' (Yasna 9.16).