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s ib ilit y of p r e s e n t s p e c i e s ' g row th in the P a r N o r th 's c o n d is io n s . T h e r e f o r e in tr o d u c tiv e w o r k s h a v e b e gu n from t h e s e s p e c i e s . T h e r e w e r e th r e e main d ir e c t io n s o f c o n i f e r s ' in trodu c tion . T h e y a r e g r e e n bu ild in g , f o r e s ­ try and f o r e s t - p r o t e c t io n g r o w in g . L a s t time p r e v a t e p lan t in d u s tr y is d e v e lo p w id e ly . M a n y c o n ife r o u s t r e e s a n d sh ru b s m ay b e u s e d th e r e w h ich a r e no t u s e d is m a s s cu ltu re . In 1938 the fir s t in tr o d u c tiv e c o n i f e r s ' s tu d y is c o n ­ d u c te d in P o l a r - A l p i n e b o ta n ic a l g a r d e n on th e main t e r r it o r y in K h ib in i, la te r a t the e x p e r im e n ta l b a s e in A p a t it y . 92 s p e c i e s o f c o n ife r s from 14 g e n u s o f 5 fa ­ m ilie s h a v e b e e n t e s t e d du r in g th is p e r io d o f w o r k . In 1974 n ew m e th od s o f r a p id p r o p a g a t e a n d g row th o f c o n ife r s h a v e b e e n w o r k e d out. M a s s m a te r ia l h a v e b e e n r e c e i v e d fo r c on tin u in g in tr o d u c tiv e te s t. D u rin g 15 la s t y e a r s 57 n ew s p e c i e s h a v e b e e n ta k in g into in t r o d u c t iv e w o r k . T h e y co n tin u e t e s t o f te n s o f e a r li e r m a s te r e d s p e c i e s . T h is time the c o lle c t io n o f c o n ife r s h a v e b e e n e x t e n d e d . T h e r e w e r e 257 s am p le s o f m o re than 70 t a x o n s in o p en g r o u n d in 1990 y e a r . T h e s e s a m p le s h ib e rn a te w ithou t c o v e r . G e n u s A b i e s , P i c e a an d P in u s a r e p r e s e n t e d m o re c om p le t e ly . On a v e r a g e e v e r y ta x o n h a s 4 s am p le s , but som e s p e c i e s a r e a g r e a t e c o n om ic a l v a lu e . T h e y h a v e m ore than 1 0 s am p ie s . T h e r e a r e m o re than 40 s p e c i e s o f c o n ife r s from 74 s p e c i e s o f U S S R ' n a tu ra l flo ra in c o lle c t io n ( P l o t - n ic o v a , 1 9 8 8 ). S ib e r ia n d e n d r o flo r a is r e c lam a te d b rim ­ ful. It is r e p r e s e n t e d w ith 11 s p e c i e s . P a r t o f t h e s e s p e c i e s is th e m ost a d a p te d to th e P a r N o r th 's c o d i - t io n s . H a v in g en o rm o u s a r e a with the n o r th e rn b o r d e r n e a r the P o l a r c i r c le and w id e am p litude th e y a r e the m os t a d a p t e d s p e c i e s . 22 s p e c i e s w e r e in tr o d u c e d from th e North A m e r ic a n d e n d r o flo r a . In th e main th e s e s p e c i e s g r o w in mo­ d e r a t e z o n e . M o s t o f them a r e t e s t e d the fir s t time. T h e y a r e 15 y e a r s old, but th e y a r e c h a r a c t e r iz e d b y h igh w in te r h a r d in e s s a n d g r e a t in ten s ity o f g row th . H a v in g w e s t E u ro p ia n o r ig in c o n s id e r a b le pa rt o f c o n if e r s d iffe r s s lo w g row th . T h e y a r e s u b je c t e d to f r e e z in g , th ou gh th e y h ib en a te w ithou t a n y c o v e r . T y ­ p ic a lly h igh -m ou n ta in s p e c i e s a r e the m ost s t e a d y . W e h a v e little c o n s o lin g r e s u lt in in trod u c tion o f c o n if e r s from M id d le A s i a an d fo r e ig n A s ia . T h e r e a r e o n ly a fe w s p e c i e s h ib e rn a tin g u n d e r c o a t o f s n ow in th e c o lle c t io n . D u rin g g r o w in g o f them th e r e w a s a g r e a t fa llin g out o f p lan ts a s a r e s u lt o f mushroom in fe c t io n s an d fr e e z in g .