PP19647 (20/1/2009).
This tetraploid conversion of H. 'Summer Serenade' was named after friend and mentor, nurseryman Roy Klehm, the introducer of 'Summer Serenade'. Hosta 'Roy Klehm' features an upright vase-shaped habit, with leaves displayed horizontally. The yellow leaves are framed by a dark green margin significantly wider than 'Summer Serenade'. Lavender flowers top the clump in midsummer.