The experiment was conducted to evaluate the effect of concentration of nutrient solution on root colonization with AMF, growth and flowering of ivy geranium (Pelargonium hederaefolium ‘Ville de Paris’) and garden geranium (Pelargonium hortomm ‘Aquarello’) cultivated on ebb-and-flow benches. Four concentrations of nutrient solution were applied: EC 1.0. 1.5, 2.0 i 3.0 mS‧cm⁻¹. The concentration of nutrient solution did not affect colonization of root system with AMF. The effect of concentration of nutrient solution and mycorrhization on fresh matter, shoot length and shoot number of ivy geranium was negligible. The earliest flowering was noted in plants fertilized at 3.0 mS‧cm⁻¹. These plants had also the greatest number of inflorescences. Garden geranium grown at mS‧cm⁻¹ obtained the highest fresh matter and the longest shoots. Mycorrhizal plants had lower fresh matter and shorter shoots than the non-mycorrhizal ones. Neither the concentration of nutrient solution nor mycorrhization did affect the flowering of garden geranium.