Now that you mention that, I see that. You're right. Hmmmm. Well, maybe they just mispelled it? No reason jumping to conclusions. Who knows, maybe they missed a jot or tittle (poor penmanship or something) - you know that Arabic script is pretty complicated stuff (just look at the scrilly stuff scribbled all over the U.S. Islam Christmas stamp released shortly after 9-11) and the word works just happens to appear to an untrained eye as being "fertilizer" when in all actuality it really does say "castor beans". Hey, it could happen.
After all, our legislators do the same thing with the Constitution, so what's the difference here?
When's the last time you tried to write "castor beans" in scrilly script like that. I bet it would look like fertilizer too.