Gardening Day or Tree Planting Day in Sri Lanka
Gardening Day or Tree Planting Day in Sri Lanka is held on October 15. This event in the second decade of the month October is annual. 
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October is 'Vana Ropa' month. An island-wide programme to plant trees has been launched by the Ministry of Mahaweli Development Podi-Hamuduruwoand Environment during the month. Since the Ministry comes under the President and with his keenness on environment, let us hope that it will be a success. Elaborating on 'Vana Ropa', the Ministry has announced that the programme will be carried out "in all public institutions with the contribution of private and Non-Government Organisations."
In fact, it mentions 15 November as the National Tree Planting Day in Sri Lanka.
Similar holidays and events, festivals and interesting facts
International Environmental Education Day on October 14 (established in 1991);
Wildlife Workers Day in Russia on October 14 (unofficial professional holiday);
International ShakeOut Day on October 17 (Drop, Cover and Hold On! If nothing else, remember to take those three steps if and when an earthquake strikes);
International Day for the Preservation of Nature on October 18
Arbor Day in Czech Republic on October 20
Lionfish Spearing in Belize on October 21 (Marine conservation holidays, September to May);
National Annual Tree Loving Day in Thailand on October 21
Energy Saving Day on October 21