The Collaborative International Dictionary of English v.0.48:

Rattoon \Rat*toon"\, v. i. [imp. & p. p. Rattooned
   (-t[=oo]nd"); p. pr. & vb. n. Rattooning.] [Cf. Sp.
   reto[~n]ar.]
   To sprout or spring up from the root, as sugar cane from the
   root of the previous year's planting.
   [1913 Webster]