The aim of this research was to prepare a monolithic porous carbon-carbon composite on the basis of porous stiff skeleton obtained via carbonisation of blocks cut from horticultural waste, lignified inflorescence stems of yucca, Yucca flaccida. Then the blocks were infiltrated by furfuryl alcohol, polymerised, cross-linked and carbonised. Raw yucca carbonised at various temperatures and the resultant ecological composites were characterised using the following methods: helium gas densitometry, ultrasonic and electrical resistance measurements, the physical adsorption of N-2 gas at -196 degrees C, scanning (SEM) and transmission (TEM) electron microscopies. Elemental analysis, i.e. the CHN content and organic constituents, were determined for raw yucca. The thermal decomposition of composites and their precursors were investigated at temperatures ranging from 20 to 940 degrees C using thermogravimetric analysis (TGA). The composites were found to be highly porous carbon materials thermo-resistant in inert atmosphere with a strong skeleton and hierarchically ordered structures. Their elastic and electrical properties were found to be anisotropic and dependent on the support properties.