One day I got a couple temperate pings given to me and I put them into the bog. Pings were not really that much of an interest at the time, so I never gave it a second thought how they propogate, etc., was not even sure they would survive. They did survive and flourish. The next year in spring I was doing my normal bog weeding, pulling up any little green "weed" I saw before they got out of hand. Shortly after that I was taking some pictures, put them on the computer, and discovered that some of those "weeds" I had missed days earlier were in fact little baby pings. Obviously I had pulled up and killed many baby pings. You could hear my scream a block away.
Another dumb thing I did taught me to READ the label before you start spraying what you think is bug killer but really weed killer in a similar-color container.