The present study was conducted to generate information on effect of seed size on germination of Semecarpus anacardium in Garhwal Himalaya. Semecarpus anacardium is a medium sized deciduous tree, growing up to 10-15 metres in height. The plant grows naturally in tropical and subtropical climate and distributed in sub-Himalayan region, Tropical region, Bihar, Bengal, Orissa and central parts of India. It’s an important medicinal plant species possessing Anti-Cancer, Anti-inflammatory and several diseases like skin disease, fungal disease, excessive menstruation, fever, constipation, etc. The experiment was carried out at HNB Garhwal University, Srinagar during 2015-2016 in CRD experimental design with five replications. There were 3 treatments namely S1 as small seeds, S2 as medium seeds and S3 as larger seeds. | Effect of seed size on germination of semecarpus anacardium (Marking Nut) in Garhwal Himalaya