A top stallion with a radiant presence, an outstanding performance record and a proved breeding record, Landjonker began his breeding career in the Netherlands where he won or was highly placed in medium to advanced level jumper tests. He has sired ten approved sons in Germany so far. Land-Boy won the 2001 Mecklenburg approval, Fighting Alpha was the undisputed winner of a stallion performance test in Redefin and parallel to breeding is also successful internationally with Lars Nieberg. According to the FN's Estimated Breeding Value statistics, his off-spring clearly have versatile talents mainly focused on jumping. Several of Landjonker's daughters have received State Premium. His off-spring are extremely noble and have fascinating movement sequences. Every year he presents premium and auction foals in several breeding areas.

Just like his sire, Landadel, Landjonker produces nothing but dark horses (no chestnuts). His dam line also produced the internationally successful dressage horse, Brillant/Beatriz Ferrer-Salat (Spain) and the approved Argentinus sons, Avellynus and Aventyno and most recently, Sir Wilson, the winner of the 2002 ZfDP approval in Kreuth.