zOMG, the "Space Orcs" Are Coming!

That could be the view of another intelligent species regarding humans.

Imagine a world where there is intelligence, but it's plant-based. The plants are like neurons and form up into brains that take up very large areas. Their thought processes could take minutes, hours or days, which is ordinarily not an issue for them, as the brains have an almost infinite lifespan. Drought or wildfires may damage them, but they'd recover. If the world has winters, the brains might go more-or-less dormant in cold weather.

Now an animal-based spacefaring species lands on that world. Can the plant-brains perceive them? Given the mismatch between neural processes, how would they communicate? What would the plant-brains do when they realize that the intruders are not only plucking them, they're (shudder) eating them?

(H/T)