This and S.laciniatum produce among the biggest, most luxuriant leaves of any hardy border perennial.
In this case they are huge and heart-shaped (like a Colocasia or Anthurium?) to 12ins across.
The flower stem is more slender and smooth than laciniatum.
A smaller species with simple green leaves and golden flowers
Leaves to 2ft long and impressively lobed, like some huge tropical fern. The stiff bristly upright flower stem is a bonus.
Easy in any fertile, retentive soil, and best at the front of the border where its stature can be appreciated. Perfect for prairie-style plantings.