There are two huge horse chestnut trees in my yard, plus I have a smaller one growing in a container. Mine have pink flowers which look really nice in the spring. I wish they would last all summer long. The horse chestnuts are toxic. My sister didn't realize that, and, fortunately, after she gathered up a bunch of them to take home, she told me she was going to roast them. She had no idea that you couldn't eat them.