Ahh - I see!

The action you assign to your seeding ground (terrain/model) mustn't be the generated seeding action itselfe!
You can assign your own action and call the seeding action out of your own terrains action:
Code:

---

action my_terrain_with_shaders_and_much_more {

 .... // your code

 seed_my_plants();  // the action generated by SEED_IT

 .... // your code

}

---

This can solve your idea?

thanx, mercuryus