On Mg(0001), processes such as terrace self-diffusion, the formation of dimers and trimers, and the step-down process do not have significant barriers and are already activated at temperatures below 25 K. It must be noted that dimer and trimer formation is highly favored compared to the respective separation processes due to a very high interaction energy. At this point, we would like to address the hypothesis that lower terrace self-diffusion and step-down barriers on Mg(0001) vs. Li(100) are responsible for reduced dendrite formation. We were able to confirm lower barriers for Mg(0001). However, the corresponding processes for metallic lithium become activated at 16 and 43 K, respectively. At room temperature, these processes should run almost equally and have no significant influence on dendrite formation.