Rotstock or Rootstock: How To spell?
The word Rotstock is misspelled against Rootstock, a noun meaning "A perennial underground stem, producing leafly s/ems or flower stems from year to year; a rhizome."
Rootstock has double "oo" is mispronounced as "o"Remember double 'OO' in between the strings r & tstock which should not be misspelled with single 'O'
Wrong Spelling:  r-o-tstock  Correct Spelling:  r-oo-tstock 
Find more incorrect spellings of Rootstock to spell right way.