Whether it was Drunk Dragon Grass or Dream Dragon Grass, Immortal Drunk or Confusing God Flower, or even the Nightmare Fruit and the Illusion Demon Fruit, all of them were strange herbs with strong dream-inducing and hallucinogenic effects.
Of course, to deceive a Hundred-Headed Giant Dragon of such a realm, these Spirit Grasses must have been growing for at least ten thousand years or have developed Daoist Patterns, birthing the corresponding laws.
Some accomplished Alchemists could even refine these peculiar herbs into rare Elixir Pills that would make a person fall into a deep sleep upon smelling their fragrance. If taken by accident without an antidote, one might sleep for a thousand years without waking.
However, such peculiar herbs were already rare. During the years Qin Feng cultivated, besides the Confusing God Flower he saw while helping Wen Qing'er tame her Lifebound item in the Heavenly Pool Secret Realm, he never again encountered any of the other strange herbs.