Yep we do that with outdoor plants. Sometimes I will go out the back door and there will be a whole bunch of something sitting in a dish of water from my neighbor to the east. I try to divide and give things back too. Spiders though! Oh Becky, I have so many (hanging at my windows in lieu of draperies that there is never a time that I am not rooting more in the kitchen! I have a spider epidemic here!!!!