PurposeTo critically examine the holistic implementation of green supply chain management (GSCM) practices in entrepreneurial ventures in Thailand.Design/methodology/approachThe study observed 121 organizations (or respondents) covering 13 industries from both the public and private sectors. The research process started with a semi-structured interview and observation, followed by focus group interviews. The data collected were then analyzed using content and thematic analysis methods.FindingsRespondents (chiefly entrepreneurial ventures) have good eco-knowledge. Most have more than 3–10 years of experience implementing eco practices that have significantly reduced their eco-impacts and costs. The study also revealed that firms’ directors developed environmental management systems (EMS) and cultures of their firms. This study rejected previously held beliefs that factors including country, firm size, industry type, years of activity and certification, impact both positively and negatively on green performance. However, the influence of top management, green entrepreneurial orientation (GEO), respondents’ different perceptions of the GSCM boundary and the COVID-19 pandemic have impacted the success of GSCM’s implementation.Research limitations/implicationsThe COVID-19 pandemic obstructed observing GSCM implementation at the respondents’ workplaces. This could reduce the validity of the research, as all evidence obtained was selectively provided by the respondents, not the researchers.Practical implicationsNew practitioners are encouraged to focus on green logistics (GL) at a firm level as opposed to the broader supply chain. Effective GL practices recommended utilities usage reduction, reuse/recycle waste and green procurement.Originality/valueGSCM researchers should focus on patterns of over-consumption, over-trading and relevant institutions that cause environmental unsustainability, rather than specific units in supply chains. The Buddhist sustainable sufficiency concept should be considered as a viable lens to analyze GSCM as it complements existing theories.