<p>Present study was conducted to assess the possibility of growing <i>Cymbopogon flexuosus</i> Steud Wats for green capping and economic utilization of fly ash dump sites. In this regard a pot experiment was conducted with ten treatments in three replications i.e. T1 (100% Fly ash), T2 (95% Fly ash + 5% Press mud), T3 (90% Fly ash + 10% Press mud), T4 (85% Fly ash + 15% Press mud), T5 (80% Fly ash + 20% Press mud), T6 (75% Fly ash + 25% Press mud), T7 (70% Fly ash + 30% Press mud), T8 (60% Fly ash + 25% Press mud + 15% Soil), T9 (50% Fly ash + 25% Press mud + 25% Soil), T10 (100% Soil). 100% survival was recorded in each treatment. There was a significant increase in plant height, number of tillers, herbage and oil yield by application of press mud and soil in fly ash. The&#xa0;citral content in different treatments were recorded from 70.14 to 75.55% which was at par the range of citral content reported in essential oil samples from local market and crops grown in normal soil. The experimental results revealed that <i>C. flexuosus</i> can be successfully cultivated on fly ash dump sites. The herbage and oil yield can be increased by the&#xa0;addition of press mud and soil in the fly ash substrate.</p> Graphical Abstract: <p></p>