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You can always grow plants on top of the terrace. Plants(rose,kanakambaram,hibiscus,jasmine etc) can always can always be grown, but if you want to grow trees(neem,mango,lemon,etc), you can go for Bonsai. Whether it is plants or trees you have to take a lot of care cleaning the terrace, watering the plants and taking care of the plants.
If you are planning for container gardening it is a good idea, you can grow all sort of plants,flowers,vegetables etc in pots and containers, and if you want to do it otherwise you need to have proper drainage system installed.