The present paper reveals the results of a study on the tulip collection in the environmental conditions of "Al. Borza" Botanical Garden Cluj-Napoca, concerning two characteristics: earliness of flowering and blooming time. Most tulip cultivars are originated in the Netherlands where environmental conditions are different from those in Cluj-Napoca. The tulip collection of "Alexandru Borza" Botanical Garden of Cluj-Napoca has been set up in order to maintain its decorative value as long as possible. In this regard, there were planted cultivars with various ranges of earliness of flowering and long duration of blooming period. Flowering time of the tulips, which make up the "Alexandru Borza" Botanical Garden of Cluj-Napoca collection last between 6-22 days. The blooming period of these cultivars is not as homogenous within the groups as expected, each group exhibiting cultivars with shorter or longer flowering period than the mean of experiment. The main objective of this study was to identify the genetic sources for earliness and blooming period, which could be used in a breeding program for early flowering tulips, as it is stated by most of the important tulip breeding.