In my work I am focused on one of the most acute problem for forestry which will be even more significant in next decades: hydraulic conductivity and tree mortality due to drought stress and subsequent hydraulic failure. With full knowledge about changing hydraulic properties, we can propose planting of different species or provenances in order to increase productivity or safety of forest stands. There are many opposing results published in this field depending on used methodology. For example, it is still not clear whether stomata are closed to avoid emboli or emboli is the reason of stomata closuring. I describe traditional and most innovative methods of measuring hydraulic characteristics and discuss possibility of being used in our conditions. My work will describe them to enlighten the new way of thinking about this issue and possible solutions with using this technology. I also propose simple design of parallel measurement of stomatal conductance and cavitation spreading in leaves during dehydration in controlled conditions. We plan to use intact seedlings without affecting vessels and water column by cutting.