The clone L31A was obtained as a cross of
L22D x
L15 in aim to obtain robust clone simillar to
L15 with improved fenestration.
There is no doubt this was fulfilled. The L31A is probably even slightly more robust than L15. But the most striking feature of clone L31A of is high durability of pitchers inherited after
L22D. The autumn pitchers can stay fresh until May or even June of next year!