According to Hessayon in Britain we spend £2 billion each year on house plants and cut flowers.
The best selling author has sold a record 16 million copies of his gardening books which amount to more than fifty.
Said Hessayon: "In most homes this plant material ends up as a few isolated pots on the windowsill or sideboard, or as a vase stuffed with a bunch of flowers. Ornaments - not decor features which change the look of the room.
"We can do so much more with living plants."
Dr Hessayon's new book reveals the craft of "roomscaping". This is the way plants and cut flowers can be used to add beauty to a room in the way we use plants when we landscape our gardens, he says.
In its pages the basics of design are explained, and the effect of grouping indoor plants together in pot groups and indoor gardens is described and illustrated.
There's also an A-Z guide to 350 plants and over 400 cut flowers included.