The article presents the results of phenological and morphometric studies of plants of the species Tulipa tarda Stapf as a function of some environmental factors. Morphometric differences were observed in the sense of an increase in plant height, leaf size and fruit width; decreased filament length and number of flowers by inflorescence. The multiplication factor of the child bulbs was 1–2, the seed yield was low. The phenological study found that the short phase phenospectrum is characterized by fluctuations in the minimum temperatures in the range of –5 – +15 °С and maximum temperatures of +5 – +30 °С. In the long phase phenospectrum, the minimum temperatures oscillate below zero 0 – –10 °С, and maximum temperatures have a period of 0 – +20 °С. The studies of the influence of eco-factors on plant morphology were established as following. The sum of the temperatures has a great influence on the size of the generative organs, and the indicators for the previous year affect the number of flowers in the inflorescence. The number of sunny days affects the height of the perianth, the indicator for the period April-May strongly affects the number of leaves in the next year. It leads to the conclusion that the leaves on the bud of the substitute bulb are formed precisely during the growing season, up to and including flowering. The strong influence of low rainfall in April-October has an effect on the number of flowers in the following year: the less rainfall, the more flowers are there per inflorescence. It was concluded that flowers are laid at the daughter bulb during fruiting and later.