Luk Bamboo had been converted into biomorphic composites containing high-purity cristobalite-SiO2 and β-silicon carbide (SiC) nanowires after sintering at 1200° and 1400°C, respectively. The fabrication process was simple, in which no catalyst was needed and the sintering temperature was low. The procedure included pyrolysis of biotemplates, infiltration of a Si-containing reactant, and sintering. Both the SiO2 and SiC nanowires were grown by a two-stage growth mechanism, in which the impurities from raw bamboo acted as catalysts. We successfully demonstrated that inexpensive Luk bamboo could provide a breakthrough, cost-effective, and eco-friendly route for self-assembling one-dimensional nano-structures in highly porous biomorphic materials.