Within the scope of since March, 2007 in Deutsch-Wagram/Lower Austria running research project „Woody structures in flood protection levees“ the influence from low to medium grown, flexible wood vegetation (willow shrubs) is examined for the stability and maintenance of flood protection levees. Besides, an investigation main focus is the development of the vegetation under the extreme conditions in flood protection levees. These distinguish themselves above all by strong soil compaction and dry location relations. Within the scope of this diploma thesis the vegetation development of the soil bioengineering construction methods applied on the test levees was documented and evaluated in the second vegetation period. Examined construction methods were: jute net - straw deck sowing with grass-herbs, dormant cuttings, transversal living brush matress and longitudinal living brush matress. The survey of the grass-herbs sawing shows a dense sod by which a high surface protection is guaran-teed. To keep the sod, nevertheless, a regular mowing is necessary. At the living brush matresses and dormant cuttings an increase of the upper- and subterranean biomass was noticed by levee crest to levee base. The reason presumably lies in the rising water availability from top to bottom. The dormant cuttings don`t offer protection against depth erosion, but they represent only a punctual planting. The living brush matresses guarantee an immediate surface protection and already show after five months a good root formation. Furthermore high shoot regeneration take place with the living brush matresses also in the second year. The root-shoot relation examined with the transversal living brush matress show that the willows form a high root mass already during the first two years. Compared with the longitudinal living brush matress, the transversal living brush matress perform on account of the across laying to the face inclination a higher opposition against ground leaching with strong rain and overtopping.