"sweet flowers" is correct and usable in written English as it is a noun phrase that refers to flowers that have a sweet scent or appearance.
Example: The garden was filled with sweet flowers, from delicate roses to vibrant tulips.
The stink of the men's shoes, the sweet flowers, the pomegranates.
"My people are hedonists from Rio, but they are sweet flowers compared to Trump," Torres said.
The second batch of sweet peas (cupanii and others) are climbing up the poles between the beans unfurling their first sweet flowers.
It is a spindly evergreen tree with glaucous leaves (the underside of which is silver) it hasn't flowered as yet and I guess I'll never see it now or get to smell it's sweet flowers.
A beautiful black velvet dress, with lavish ties at the shoulder, stood out in relief against the model's white python bodysuit, while a leather bodysuit embroidered with sweet flowers heightened the sensuality of an evening dress in feathered coral chiffon.
The three good emotions (good will, union with goodness, and nondistinction) lend the aura the fragrance of sweet flowers, the softness of butter, a taste sweeter than fruit or honey, and a pleasing hue ranging from bright red to pure white.
That Robinsonella is a beautyful shrub or small tree with a profusion of white sweet scented flowers.
But the "pastoral scene of the gallant south" is shattered by murder, the beauty of those sweet, fresh flowers giving way to the ugliness of violence.
From dung come sweet-scented flowers.
Their starry spires of small, sweet-scented flowers poke above pairs of shiny, rounded leaves.
Plants with yellow petals, sweet-smelling flowers widely cultivated as sand binder.
