Lupins produce colourful blossoms and nutritious beans. Just how these plants draw water has now for the first time been observed in three dimensions by a team at the HZB-BER II neutron source in Berlin. They improved the temporal resolution of neutron tomography more than one-hundred-fold and obtained a detailed 3D image every ten seconds. This ultrafast neutron tomography is suitable as well for analyses of dynamic processes in other materials.