The Municipal Secretariat of the Environment maintains a botanical garden and three green houses for the annual production of 150,000 seedlings of native and exotic tree species , 16,000 seedlings of fruit trees , 260,000 seedlings of flowers , foliage and underbrush , on top of the total maintenance of 350,000 seedlings . The Municipal Secretariat of the Environment maintains a botanical garden and three green houses for the annual production of 150,000 seedlings of native and exotic tree species , 16,000 seedlings of fruit trees , 260,000 seedlings of flowers , foliage and underbrush , as well as the maintenance of 350,000 seedlings .