Currently, water provision for food production in Africa's agricultural system is primarily focused on blue water estimates, which are typically used in irrigated agriculture. This has resulted in both research and policy focusing on adapting agricultural practices to blue water supply and access from rivers and lakes. and overlooks the equally important role of green water. Green water is defined as the soil moisture available for plant uptake as a result of rainfall infiltration. Africa's food production relies heavily on rainfed agriculture, making green water a crucial resource. However, it is unclear how much green water can contribute to transforming food production through adapted agricultural practices. The aim of our study is to assess the hydroclimatic regime and identify regions dominated by green and blue water at the landscape level. In regions dominated by green water, we also map the potential for additional agriculture through adapted farming practices. We investigate the extent and location of changes in the blue-green water landscape under various climate change scenarios. To achieve this, we employ the LPJmL dynamic global vegetation model to simulate water flows, vegetation growth, crop production, and climate interactions from 1901 to 2100. The simulations indicate that green water has a high potential to enhance food production in agriculture, particularly in semi-arid, semi-humid, and wet sub-humid regions. However, most wet humid regions are already operating at their maximum capacity. The findings also suggest that integrating green water into agriculture, for example, through rainwater harvesting systems, can improve the efficiency of food production, particularly in regions where water efficiency has been low. This highlights the significance of green water and its potential as a crucial water source for enhancing food security in Africa.