|Two years ago, we removed two huge pine trees from our back yard . My mother then cleared and mulched the area where they had been in order to prepare it as a starter bed. She planted three hibiscus and a few tomatoes and marigolds. That June, we noticed some mystery plants sprouting. The casual gardeners that we are, we decided to let them grow...just to see. Well, it turned out that we ended up with a ton of pink petunias that were about 2' tall and seemed to spread(not as dense as a wave though)and they keep returning. We cannot figure out where they came from, since we didn't plant any kind of seed. Our 87 year old neighbor did tell us that his mother(who built the house) used to have a flower garden there , in which she grew petunias,but that was over 40 years ago. Are these flowers really petunias or some kind of look-alike? where could they have come from? thanks!