HerbDoc has her own favorite giant coneflower:
Here’s another native Rudbeckia that’s stunning if you have a spot for it. Since it was given to me at a plant swap and had no tag, it took me a while to identify it.
The common name is tall or green-headed coneflower with the Latin name being Rudbeckia laciniata. The neatest thing about this particular perennial is that the lower leaves are pinnately divided into 3 – 7 irregularly lobed leaflets. They remind of giant’s hands!
The plant is said to grow 3-10 feet high, and it is easily 10 feet tall against my garage wall. The flower heads are yellow and about 4 inches wide with greenish-yellow knobs in the centers.
I’m hoping it spreads as I really love the way it looks. Unfortunately after yesterday’s heavy rains it may need some support as some of the stems fell to the ground.