Investigations were carried out in 2010 to optimize chicories' roots' growing in LUA Horticulture catedral garden. To optimize chicories' roots' growing was carried out two-factor investigation: factor A – sowing time, B – growing distances among plants. It was determined, that the medium mass of roots' that were grown 7,1 – 8 cm distances and sown earlier (VI.03 d.) was reliably the biggest (0,495 g). The smallest mass of the roots was these, that grown 5 – 6 cm distances and sown later (VI.15 d.). To compare with investigation average, reliably the pargest diametre of root (6,6 cm) was roots, that grown 6,1 – 7 cm diametre and sown earlier (VI. 3 d.). Reliably the biggest yield of the roots' (59,4 t ha-1) was determined these roots, that grown at the biggest distance (7,1 -8 cm) and sown earlier (VI.03 d.). Reliably the biggest content of dry matter (28,36 %) was determined in the roots that were sown VI.03 d. and grown 5 – 6 cm distance. To compare with average of investigation, reliably the biggest amount of vitamin C (63,4mg kg-1) was determined in the roots, that grown 5 - 6 cm and sown on the third of June-93,2 mg kg-1.The biggest amount of potassium (1124,55 mg kg-1) was determined in the roots, that grown in 7,1 – 8 cm distances.

Raktažodžiai: Key words: chicory roots, planting time, growing distances, the chemical composition.