Colliders go through each other

Hi, I have made a scene where “stalk” has to lift the player up but player goes through the plane and I cannot figure out why it happens, maybe someone can help me.
Controls are A, D for movement, Space for jump and E to activate the seed when the player is on the top of the sphere.

1599740–96467–$SeedDemo.zip (7.73 KB)

anyone?!