Department of Environment 
As per latest Forest Survey of India report 2017, forest cover of Delhi has increased by 3.41 sq km to 192.41 sq km from 189 sq km in 2015. After having achieved unprecedented success in increasing the green cover, efforts have been sustained to plant more and more trees on vacant lands through active involvement of greening agencies and community participation. This also includes free distribution of saplings to schools, RWAs, NGOs and other citizen groups through Forest Department’s nurseries, petrol pumps, CNG Stations, mother dairy booths etc and financial assistance to RWAs for maintenance of parks and gardens.
Today, Delhi has nearly 20000 small/medium/big recreation parks and gardens, 42 city forests, 4 ridge areas, 6 bio-diversity parks and other green belts. A total of 13.78 lakh saplings have been planted by various organizations/agencies in 2017-18. The total recorded forest area in Delhi is 102 sq. km i.e 6.88% of the geographic area of which the Reserved and Protected Forests constitute 76.48% and 23.52% of the total forest area respectively.
The Forest department is striving to increase the forest and tree cover in Delhi to 371 sq.km by the end of 2022.
To see the list of Common Indigenous Tree Species of Delhi. Click Here
Delhi Parks and Garden Society (DPGS), an autonomous body under Department of Environment, provides financial assistance to RWA’s / NGO’s for maintenance of parks / gardens and setting up of decentralized STP’s on the basis of no objection certificate from area MLA and concerned land owning agency. for the Finnacial year 2019-20 financial assistance for maintenance of Parks provided to 435 RWA’s/NGO’ with 1797 parks & 538 acres and amounting to Rs. 6,66,45,513/.