Available from - Palatine Roses
https://palatineroses.com/product/larissa/?v=7516fd43adaa

Available from - Dehner Garten-Center (Dehner GmbH & Co. KG)
http://www.dehner.de/pflanzen-pflege-ziergehoelze-rosen-bodendeckerrosen/Bodendeckerrose-Larissa-X007878465/?ac=-s-785

Some lower leaves get black spot, but generally the plant is very healthy even in high humidity. The blooms are very double and last quite a while before turning brown and shattering, although there are no long stems ideal for cutting. It is sterile; spent blooms turn brown and shed. In periods of frequent rain the flowers can turn brown at the edges and appear to have a dirty, unpleasant color. Generally, though, it is beautiful and free-flowering.

Lineage:

"BACKGROUND OF THE INVENTION

The new variety of rose plant of the present invention originated from a controlled crossing in a breeding program of two distinct parents during the summer of 1998. The crossing was between `KORmixal` and `KORparesni`, both non-patented roses."

Source: http://www.patentgenius.com/patent/PP21429.html