> 15,000, including more than 5,000 types, species and forms of trees and bushes. This is one of the largest collection of plants in Northern Europe. The gardens cover 129 hectares. There are collections of rare and protected plants (131), a wide variety of low-growth coniferous plants (~1,000 types), bulbous plants (> 3,000), deciduous trees and bushes (250 types of rhododendrons, 470 types of roses, 230 types of hawthorn and 240 types of osier and willow). There are 210 types of dahlias, 150 of astilbes, 160 of peonies, and 120 of phlox. There are conservatories with 2,165 types and species of plants. There is an exhibition of edible and medical plants (1,113 species). There are collections of decorative and edible plants that have been bred in Latvia. There are also collections of untraditional berry plants, along with a herbarium (50,000 leaves). In the garden, scientific work is done to protect the ecology and the genetic fund of rare and protected plants. Specialists work on designing new decorative and medical plants. Unique species: There are two types of the English Oak (Quercus robur) that were developed in Latvia – “Timuki” and “Fenesii,” as well as one type of the black alder, “Incisa.” Also seen in the gardens are the American Tulip Tree (Liriodendron tulipifera – one of the largest flowering trees in Latvia), the Bald Cypress (Taxodium distichum – the largest tree of its kind in Latvia), the Honey Locust (Gleditsia triacanthos), and the Fringe Tree (Chionanthus virginicus).