no....unless tehy get summerged in water ur fine......from experience i had 20 plants out,,,,i watered them jsut before a big heavy rain(they were about 1-3 inches hich) and 2 got knocked to the ground from drops but hte other 18 were fine...also my soil is clay nad has horrible drainage and is constantly wet and they are doing ok...not spectacular but growing fine....weed is a weed and can take alota shit...................btw the 2 that got knocked down i propped up with forks nad the sun brought them back to life.......