There have been a few questions on mobile plants on this site and even more on their intelligence, but one that has not been asked so far is related to the lifeblood of creatures: blood. Inside of Earth plants, the circulatory system is less complex, as the organism does not need to move. But surely if they were mobile they would have a need for an effective circulatory system? What would the botanic equivalent to the animal circulatory system be?
My current thought is that the hydraulic fluid that a plant's vegetal muscle uses would be the closest thing to blood.