I had few of this yellow flowering plants at the left side of our house. I don't know the name of this flower but I love it because it is a very low maintenance plant and it comes back every year.
The yellow popped out when combined with green and white doesn't it?
Before going to Korea, I planted some of the plant above with green and white as a border but when I came back it took over most of the plants I planted in the flower bed. I decided to take it all our yesterday because the leaves turned brown and it did not look good anymore.