Species mixing reduces drought susceptibility of Scots pine (Pinus sylvestris L.) and oak (Quercus robur L., Quercus petraea (Matt.) Liebl.) – Site water supply and fertility modify the mixing effect

•Analysis of drought response patterns in mixed and monospecific stands along a wide ecological gradient across Europe.•Oak exhibits a higher average growth resistance and resilience than Scots pine.•Species mixing increases average drought resistance of Scots pine and resistance and resilience of oak.•Drought responses in mixtures and monocultures are dependent on tree size, site water supply and fertility.