New technology of plant growing in hothouses is proposed by this article. This method is bazed on the increase of dioxed carbon (carbonic gas) in atmosphere around the plants. In our cold climate it is necessary to warm the hothouse by manifold heating systems, especially by fuel burning installations. Hence, we have possibility to unite heat and nutritious carbonic gas by direct bring of burning products to green plants. However, this burning products must be pure, without harmful admixture. So called pulsating combustion realize this condition.