Seasonal rhythm of development of some North-American pines under the conditions of bashkir Cis-Urals

Results of comparative study of phenological phases of three North-American pines ( Pinus banksiana Lamb., P. strobus L., P. ponderosa Dougl. ex Laws.) in Bashkir Cis-Urals are presented in the paper. Phenological traits of the species are corresponded to natural-climatic conditions of the introduction region. It makes them perspective for use in landscaping.