What is he going to plant?
I think he is going to plant some flowers.
What should a person do to make his garden look nice?
He should use some pots to keep things neat and to reuse some old things (tires, doors, rubber boots) in a beautiful way.
Does he enjoy his hobby? Why?
I think he does, because he looks like a person who is keen about his hobby and he does everything with care and love.
Do you like gardening? Why? Why not?
I like gardening because it’s interesting and relaxing. / I don’t like gardening because it’s not my cup of tea!