Dear Sri Selvam,
Most welcome to our Forum.
Contact Tamilnadu state Government , Forest Department , either in chennai or Tirunalveli. In every District of all state Governments, Forest Department will exists.
They will issue either seeds or Seedlings of social Forestry recommended varieties, ie, native trees. either free or for cost. Generally cost will be at lower side.
The private Nurseries also sell seeds and/or seedlings of social forestry varieties, native tree seedlings. Generally Cost will be on higher side.
Some farmers also collect the native tree seeds and they sell at lower prices. In markets also, shop keepers sell seeds of some native tree varieties. Enquire in local markets and in season they will be available. Please enquire local nearby farmers.
With best wishes, g.p.rao, farmer