The flowers that asshole dog Jack is nosing around in are called Nicotiana. They throw a purple flower that comes out in the morning and evening, then close up during the heat of the day. There must be no nectar to them because it doesn't attract bees or hummingbirds at all.
It's an invasive annual that disappears completely during the cold months but comes back like gangbusters mid to late spring, growing to about 4 feet tall. When we first moved in, there was exactly one plant on the left side of the steps to the porch. Now it's surrounding the porch and growing on the eastern side of the house. I keep it restricted there just by mowing to within a couple feet of the porch and house.
