Forest owners have to integrate multiple risks in order to improve the resilience of planted forests to many biotic and abiotic threats. How do they identify and assess these risks? Which criteria are the most important to take their decision in a context of uncertainty about the impacts of multiple risks? An eight-year qualitative survey of French forest owners (Aquitaine region) shows that they often think to one specific risk and more rarely in terms of combination of natural hazards. However, when faced to multiple sources of risks, they combine different kinds of rationality and knowledge to take their decision: They build a strategy based on 1/ traditional knowledge and scientific advances when these exist 2/solutions that do not adversely affect the economic profitability (due to a high level of financial losses or insurance costs) 3/combination of forestry models that are the most resilient to the combination of risks (short and long rotation, diversification, introduction of mixed species ). Despite these adaptative strategies, they expect more certain knowledge in the field of ecological functioning and economic evaluation.