He showed a great interest in the natural sciences and a gift for poetry from an early age.

Grošelj campaigned in favour of the establishment of a Slovene university (even as a freshman in lectures in Vienna).

In 1933, the natural sciences section of the Muzejsko društvo za Slovenijo (Museum Society for Slovenia) began on his initiative to publish a paper entitled Proteus, for which Grošelj was chosen as the editor.

He also left a theoretical study on the promorphology of organisms, and his lifework Splošna biologija (General biology) unfinished.

[1] The Prirodoslovno društvo Slovenije (Naturalists’ Society of Slovenia) has awarded the Grošelj plaque in his honour since 1984.