Нина Николаевна Данилина The authors have studied the possibility of tulip cultivation without digging as exemplified by different varieties and species of tulips: three cultivars from the Darwin’s hybrids garden group -Yellow Dover Oxford of Beauty and Beauty of Apeldoorn; Princeps from the group of Foster Tulips and Miscellaneous group samples, their varieties and hybrids; Little Princess, which is a hybrid between T. hageri Heldrelch and T. aucheriana Baker; T. tarda Stapf, T. eichleri Regel., T. vvedenskyi Z. Botsch. Within three years, the researchers recorded a number offlowering and juvenile plants, their biometric characteristics, determined the number and weight of bulbs, and fixed the attack of plants from diseases and pests. It has been established that for the inclusion of tulips in longterm flower beds, attention should be paid to the varietal and species features. Preference should be made for tulips that are less sensitive to dry dormancy conditions (humidity and temperature during the flower formation period), resistant to diseases, with the average coefficient of biological reproduction and with a good energy of growth in juvenile bulbs. It is necessary to use medium and small bulbs in addition to large flowering bulbs to ensure the uniformity of flowering in every growing season. It is recommended to use the following varieties tested in this research: T. tarda Stapf, T. vvedenskyi Z Botsch., Little Princess and Beauty of Oxford.
Научная статья 
perennial flower beds