Answer: rhizome

AnswerCrossword Clue
RHIZOMEUnderground stem that produces 5-Acrosses above and 68-Acrosses below
RHIZOMEGinger, e.g.
rhizomea rootlike, underground stem, also RHIZOMA
rhizomerootlike subterranean stem, commonly horizontal in position, that usually produces roots below and sends up shoots progressively from the upper surface