Environment thumb|upright|Phoenix Park in the summer thumb|Source of the Furry Glen stream There are 351 identified plant species in the park; three of these are rare and protected. The park has retained almost all of its old grasslands and woodlands and also has rare examples of wetlands. Deer were introduced into the park in the 1660s; the current 400–450 fallow deer descend from the original herd. 30% of the park is covered by trees, mainly broadleaf.
Environment thumb|upright|Phoenix. Park in the summer thumb|Source of the Furry Glen stream There are 351 identified plant species in the park; three of these are rare and protected. The park has retained almost all of its old grasslands and woodlands and also has rare examples of wetlands Deer were introduced into the park in the 1660s; the current 400–450 fallow deer descend from the original herd. 30% of the park is covered by trees, mainly broadleaf.