Dilijan National Park among four juniper species occurring in the national park. There are well conserved juniper stands on the rocky slopes of Mount Abeghakhar in the basin of the River Aghstev. The forests in the national park are rich in fruit trees and bushes such as oriental apple – "Malus orientalis", walnut - "Juglans regia", cornel - "Cornus mas", plum - "Prunus" spp., blackthorn - "Prunus spinosa", pear - "Pyrus communis" subsp. "caucasica", gooseberry - "Grossularia reclinata" ("Ribes reclinatum"), medlar - "Mespilus germanica", common hazelnut - "Corylus avellana" (see also Hazelnut Reservation), various species of Blackcurrant - "Ribes" spp., and hawthorn -
Prunus lusitanica and Oregon as invasive. It is thought to have spread from cultivated areas into natural areas by birds who consume and defecate the fruits away from the source plant. It has gained the Royal Horticultural Society's Award of Garden Merit. The leaves of "Prunus lusitanica" contain cyanide and will release this into the environment if burnt or if crushed. The fruit is somewhat edible if fully ripe, but if it is bitter, it is toxic and should not be eaten. Prunus lusitanica Prunus lusitanica, the Portugal laurel, is a species of the genus "Prunus", related to the cherry. It is