A field experiment was carried out during 1999-2000 to study the effect of quanturm (N-acetyl thiaozolidine -4- carboxylic acid), a plant bio-stimulant on grape variety Tas- A- Ganesh grafted on 1613 C rootstock, Treatments comprised of Quantum @ 0.02, 0.05 and 0.1 per cent sprayed at 45, 75 and 90 DAP (days after pruning). Clusters were also dipped twice at 102 and 112 DAP. Results reveated that quantum increased the mean shoot length, but not leaf size,leaf chlorophyll content and specific leaf weight (SLW). The treatment with quantum @ 0.05% with two foliar sprays at 45 and 75 DAP and bunch dipping once at 102 DAP was considered as the best and was effective in increasing the yield and improving berry characters.