Castor Bean...

This plant grows as a wild weed here in many areas of California. It also becomes a tree here and lives for several years.

I can see it as a tree, D1~ I had one in my other garden that was 8 ft. tall! Very interesting plants...deadly, but interesting. Source of Ricin (nerve) gas I believe. (Ricinus communis)?

Yes, the seeds are very poisonous. It's amazing once it's processed, it becomes castor oil.

Yes, castor trees can become very tall and big within a very short period of time.

Castor trees pop up along the freeways in asphalt! (and all over empty fields). It's so hardy.

Here's one in Balboa Park:

http://www.growsonyou.com/photo/slideshow/226366-ricinus-communis-castor-bean-tree/member/Delonix1

does it have any natural enemies, or diseases? Some plants are only susceptible to kryptonite! lol....

No, it has no natural enemies. I see them all over the place here. Sometimes there's fields with hundreds or thousands of this tree.