Unripe mulberries are halucinogenous? https://www.erowid.org/herbs/mulberry/mulberry_info2.shtml
tl;dr - "White Mulberry - All parts of white mulberry, except for the ripe fruit, contain a milky sap (latex) that is toxic to humans. Although humans may consume ripe mulberry fruit, ingestion of unripe fruit can result in stomach upset, stimulation of the nervous system and hallucinations."

Umm, not so fond of psychedelic states as to consume latex sap. I'll pass, thanks.