Brihajjataka 3.6

3.6

horā indu sūri ravibhir vibalais taruṇāṃ toye sthale taru bhava aṃśa kṛtaḥ prabhedaḥ/
lagnād grahaḥ sthala jala ṛkṣa patis tu yāvāṃs tāvanta eva taravaḥ sthala toya jātāḥ//(va ti.)

When the ascendant, the Moon, Jupiter, and the Sun are weak, a distinction of trees in water or on land is made by the navāṃśa born of the tree; / As many houses from the ascendant as the planet lord of a land or water sign is distant, just so many are the trees produced on land or in water.