As the name might imply, this is
a sport of H. 'Sum and Substance' which was introduced by
Jan van den Top but has not been registered. It also becomes a huge
mound of foliage. The leaves are moderately corrugated,
have deeply lobed margins, are cupped both up and down and have a
long, distinct tip. It has thick substance which makes it
resistant to slug damage. In late July and into August, it
produces large pale lavender flowers on four foot tall scapes.