My snapdragons are wild. Really wild. I planted one yellow snapdragon about five years ago. From that we have gotten these:
As you can see in the center photo, they are coming up all over, even between the flagstones in the path.
An extra side note: Am I crazy that I can't pull the snappies that are coming up in the path and in the crevice between the patio and the house? Anything else would be treated as a weed, but these are soooo gorgeous!