Features of vegetative propagation of new tulip cultivars of the garden class Triumph during introduction in the Steppe Crimea

Relevance. Triumph garden class tulips are among the most popular plants for spring flower arrangements, and the issues of their vegetative propagation to obtain planting material within the framework of the import substitution concept in Russia today are relevant. As part of a comprehensive study of new varieties of Triumph garden class tulips for the collection of the Nikitsky Botanical Garden – National Scientific Center, a study was conducted to identify the features of their vegetative propagation when introduced in the conditions of the Steppe Crimea. Materials and Methods. A study of 39 varieties was conducted in 2022-2023. Based on the results obtained, the average general and commercial coefficients of vegetative propagation of varieties, the yield of commercial bulbs and the resistance of bulbs to fungal diseases during storage were calculated for two years, and differences in these indicators depending on the variety and year were revealed. Results. It was established that the new varieties of the Triumph class have higher studied indicators than the old varieties of the same garden class, which were studied earlier in the same conditions. At the same time, all the studied varieties had the I type of formation of replacement bulbs, i.e. the yield of commercial bulbs was less than 60%. As a result of the study, 12 varieties were identified that have consistently high yields of commercial bulbs and their stability during storage in the conditions of the Steppe Crimea. We recommend these varieties for propagation for use in landscaping, as well as for breeding work to create new domestic varieties for the conditions of the south of Russia. Keywords: tulips; garden class; variety; general coefficient of vegetative propagation, commercial coefficient of vegetative propagation, type of formation of replacement bulbs, yield of commercial bulbs.