`One hour for home garden' (Gewaththata Peyak) will be launched in the Colombo district today by the Western Province Agricultural Ministry to mark World Environment Day which falls on June 5, Provincial Agriculture, Land, Irrigation, Fisheries, Animal Husbandry, Health and Farm Development Minister Gamini Thilakasiri said the programme will be implemented in all private home gardens from 7.00 am to 8.00 am on every Saturday and at every state institution in an hour every Friday.