so far i havnt added lime but i guess it doesnt mean i shouldnt. i didnt have any troubles at all with the indoor plants with out it. i added the guano twice a month, and it worked with no nute burn or anything. i guess i might add a little more than recomended for a 2 gallon pot, next time i might increase the amount a little more since i had no problems with it. i think a one gallon pot is 9" high x by 9"wide.