Swiss chard (Beta vulgaris L. ssp. vulgaris var. cicla) is an herbaceous biennial plant in the family Chenopodiaceae. It is highly adaptable culture on witch are related two theories about origin: the first theory suggests that the chard is from the area around the Mediterranean Sea from where it is expanded to the Middle East countries and Europe since Roman times, while the second says that the chard is expanded from China to Japan about 17 BC. Although it has the low energy value, it has an excellent combination of vitamins and minerals which have a positive effect on the human body. The aim was to determine the method of seedlings production, planting time and seedlings care. The study was conducted during the period September to October 2014 at OPG „Brkić“ Donji Miholjac. The experiment was set in the unheated greenhouse for seedlings. Inevestigation was carried out on swiss chard cord cultivar called Srebrnolisna, which is the most widespread cultivar in Croatia. Swiss chard is sown in ORTOSEMINA-20 supstrate in polysyrene containers with 209 planting sites and has reached planting size after 5 weeks of production. During the study following parameters were recorded: plant height without substrate, plant height with the substrate, root length without substrate, the amount of irrigation water, day and night temperatures in the greenhouse for seedlings and seedlings care. This study of chard seedlings showed that chard is highly adaptive culture considering to temperature variations during production, it requires no daily irrigation, and is worthy for the greenhouse production. These modest adaptability indicators of chard seedlings can be used as guidance in the further research of this high value culture.