The compost added to the greenhouse medium stimulated the rooting of geranium cuttings significantly,
increasing their root length by almost 80% and root biomass by over 40%. It also affected a 35% increase in
shoot biomass. Except propagative forms of fungi, the medium enrichment with compost simultaneously
intensified microflora development, which appeared to be particularly evident in the case of actinomycetes,
which belong to bacteria producing phytohormones; the number of these microorganisms in the rhizosphere
of plants rooted on the medium with compost was twofold higher than on the medium alone