The card does not say whether to apply the mask only to the lengths or also to the roots, and does not describe the method of use. It calls the mask a shungite-based balm-mask for hair along its entire length; the claims about the effect of shungite on the scalp and hair roots have no confirmation and are not repeated here.
General information (not a manufacturer's instruction): with oily roots or a sensitive scalp, balms are usually applied to the lengths first; look for the method of use on the packaging.