This is a hybrid of H. 'Sum and
H. yingeri that was registered by
Greg Johnson of Iowa in 2004. It grows
into a medium size hosta about 12 inches in height with a
spread of 30 inches. The leaves are nearly round in shape and
have thick substance.
The Hostapedia by Mark Zilis (2009), "Like many other 'Sum and
Substance' seedlings, 'Jaz' tends to take on the size of the
An article by Glenn Herold in
Hosta Journal (2014 Vol. 45 No. 1) states
that, "Johnson crossed H. yingeri with 'Sum and Substance' to get 'Old Coot' and
'Jaz'. Both have good substance and shiny leaves."