I discovered (I am very ignorant about plants and flowers!!) that you dont need to buy flower plants every season. If you just take care of the old ones, they drop the seeds which come up next season. And that is what happened in our campus: see the picture below.
But let me not give you a wrong impression: this approach "just let the flowers grow by themselves" - does not save you from all the hard work of gardening, done by Dhaneshwari!! She has got a very productive kitchen garden too, going on, on our campus. Happy new Year to all of you, dear readers.