Results of far eastern origin herbaceous perennials' introduction to the botanical garden of the university of Latvia.
The purpose of this study was to evaluate the changes in plant development for herbaceous perennials with Far Eastern origin (from Russia, Korea and Japan). Research was based on the historical experience about introducing plants from this region and focused on the analysis of change in flowering time, seed maturation and the height of habitus. The overall condition and phenological observations were made in three-year cycle from 1991 to 2017, and during this time data about 44 plant taxa from 16 families were collected. When compared phenology in Latvia with the region of origin, results showed that 14 taxa had no change in flowering and seed ripening starting phases, 20 taxa had belated blooming and start of seed ripening phase, whereas six taxa had earlier both the start of blooming and seed ripening. Six taxa were fruitless, and for five taxa seeds did not ripen. Habitus height remained in the same limits as in literature for 31 taxa, was higher for six taxa and lower - for seven taxa. The results are discussed according to the difference of climate parameters in regions of origin and in Riga.