Bambusa tulda Roxb. is a semi-deciduous caespitose bamboo endemic to Indo-Burma. It is known as ‘rawṭhing’ in Mizoram, India, and its mass gregarious flowering is called ṭhingtâm. ‘Ṭhingtâm’ has a cycle of about 45-50 years. The first ṭhingtâm, recorded in the region was in 1880, which was preceded by mautâm (gregarious flowering of Melocanna baccifera) in 1862; i.e., the ṭhingtâm phenomenon occurred ~20 years after the Mautâm. The last ṭhingtâm was recorded in 1981. However, there has been a localised ṭhingtâm at Zawlnuam, a village at the northwestern Mizoram. The first flowering was recorded in 2015. This unusual phenomenon needs to be investigated.