They look like plastic plants to me?
If you wanted to grow plants though, you will need some kind of substrate that hold nutrients, or fertilise them in another way. But what you need will depend on the plants that you want to grow, how much light you have, etc.
I feel like a fraud advising anyone on this because I'm starting my first planted tank myself! But I've been reading the forums etc, and the guides that people have written are really helpful.
Have a read of this one first: A guide to substrates for the planted tank
There's lots of info in the Planted Tank forum!