What's the reason?

While they were still in shock, the other Immortal Grass had also moved quietly from behind and pulled itself up just like the other plant had and squeezed into Feng Jiu's clothes. 

Upon seeing this scene, the three of them didn't react for a long time. As they had been sitting by the rock and hadn't moved, the people above didn't pay any attention to them. Therefore, besides the three of them, no one else had witnessed that strange scene. 

The old man stared at Feng Jiu and said: "Tell me, what just happened?"

Feng Jiu lowered her head and looked at the two Immortal Grass plants that were hiding in the folds of her clothes and hid them in space and planted them in the medicinal field while no one had noticed. She spread her hands and said to the old man: "I don't know either! Didn't you say that these Dazzling Fire Grass plants don't give birth to medicinal spirits? Now you're asking me, who should I ask?"