Succuli

I think we all know what is meant by succuli.  The term is usually used to mean "succulent plants".  It goes well with cacti.

Thing is, spell checkers keep rejecting the word, so I Googled it, and went to www.m-w.com and dictionary.com, even Wikipedia.  Nobody accepts it as a word.  The term seems to be in common usage, and as a descriptive linguist I would have to say the word exists.  Is the word really so new?