positively regulates actin nucleation regulation of actin nucleation positive regulation of actin nucleation biological_process activation of actin nucleation up regulation of actin nucleation stimulation of actin nucleation up-regulation of actin nucleation upregulation of actin nucleation Any process that activates or increases the frequency, rate or extent of actin nucleation, the initial step in the formation of an actin filament in which actin monomers combine to form a new filament. GO:0051127 positive regulation of cytoskeleton organization biological regulation positive regulation of supramolecular fiber organization