Ice: hexagonal; highly anisotropic (mainly basal glide). Deformation: dislocations (and more). Non-basal dislocations form subGB. Dynamic recrystallization significant (hot, heterogeneous strains). Recrystallization regimes in temperature - strain rate - grain size state space. Dynamic grain growth caused by strain-induced GB migration. Grain size reduction by rotation recrystallization. Competition of the recrystallization processes results in a steady-state grain size as surface in the state space. Clues to GS-sensitive deformation.